SGV KHOA HOC 4

["* K\u1ebft lu\u1eadn: N\u01b0\u1edbc \u0111\u01b0\u1ee3c tho\u00e1t m\u1ed9t ph\u1ea7n qua l\u00e1 c\u00e2y \u1edf d\u1ea1ng h\u01a1i n\u01b0\u1edbc. B\u00ecnh th\u01b0\u1eddng, \u1edf ngo\u00e0i m\u00f4i tr\u01b0\u1eddng, ch\u00fang ta kh\u00f4ng quan s\u00e1t \u0111\u01b0\u1ee3c h\u01a1i n\u01b0\u1edbc tho\u00e1t qua l\u00e1 c\u00e2y v\u00ec h\u01a1i n\u01b0\u1edbc kh\u00f4ng m\u00e0u v\u00e0 l\u01b0\u1ee3ng h\u01a1i n\u01b0\u1edbc tho\u00e1t ra \u00edt n\u00ean kh\u00f4ng nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c. * Ki\u1ebfn th\u1ee9c b\u1ed5 sung cho GV: Qu\u00e1 tr\u00ecnh tho\u00e1t h\u01a1i n\u01b0\u1edbc qua l\u00e1 gi\u00fap l\u00e1 c\u00e2y \u0111\u01b0\u1ee3c l\u00e0m m\u00e1t, tr\u00e1nh t\u00e1c \u0111\u1ed9ng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 cao t\u1eeb \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi v\u00e0o nh\u1eefng ng\u00e0y n\u1eafng g\u1eaft. S\u1ef1 tho\u00e1t h\u01a1i n\u01b0\u1edbc \u1edf l\u00e1 l\u00e0 \u0111\u1ed9ng l\u1ef1c \u0111\u1ec3 r\u1ec5 c\u00e2y h\u00fat n\u01b0\u1edbc. Trong \u0111i\u1ec1u ki\u1ec7n tr\u1eddi \u1ea9m \u01b0\u1edbt, qu\u00e1 tr\u00ecnh tho\u00e1t h\u01a1i n\u01b0\u1edbc ch\u1eadm s\u1ebd x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng \u1ee9 gi\u1ecdt ngh\u0129a l\u00e0 n\u01b0\u1edbc tho\u00e1t ra v\u00e0 \u0111\u1ecdng th\u00e0nh c\u00e1c gi\u1ecdt \u1edf m\u00e9p l\u00e1 c\u00e2y. Ho\u1ea1t \u0111\u1ed9ng b\u1ed5 sung (n\u1ebfu c\u00f3 \u0111i\u1ec1u ki\u1ec7n v\u00e0 th\u1eddi gian): Tr\u00f2 ch\u01a1i \u201cChim s\u1ebb v\u00e0 nh\u1eefng h\u1ea1t th\u00f3c\u201d * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 kh\u1eafc s\u00e2u \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c v\u1ec1 c\u00e2y xanh c\u1ea7n nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chu\u1ea9n b\u1ecb: 5 th\u1ebb ch\u1eef \u201cM\u1eb7t Tr\u1eddi\u201d, 5 th\u1ebb ch\u1eef \u201cKh\u00f4ng kh\u00ed\u201d, 5 th\u1ebb ch\u1eef \u201cN\u01b0\u1edbc\u201d, 5 th\u1ebb ch\u1eef \u201cCh\u1ea5t kho\u00e1ng\u201d, b\u1ed1n h\u1ed9p \u0111\u1ec3 \u0111\u1ef1ng 4 lo\u1ea1i th\u1ebb ch\u1eef tr\u00ean, 1 chi\u1ebfc m\u0169 c\u00f3 h\u00ecnh chim s\u1ebb, 5 chi\u1ebfc m\u0169 c\u00f3 h\u00ecnh h\u1ea1t th\u00f3c, ph\u1ea5n vi\u1ebft \u0111\u1ec3 v\u1ebd m\u00f4 h\u00ecnh c\u00e1nh \u0111\u1ed3ng k\u00edch th\u01b0\u1edbc 2 m \u00d7 5 m. \u2013 GV l\u00e0m qu\u1ea3n tr\u00f2, ph\u1ed5 bi\u1ebfn lu\u1eadt ch\u01a1i: M\u1ed9t HS \u0111\u1ed9i m\u0169 \u0111\u00f3ng vai \u201cChim s\u1ebb\u201d v\u00e0 n\u0103m h\u1ecdc sinh \u0111\u00f3ng vai \u201cH\u1ea1t th\u00f3c\u201d. T\u1eebng \u201cH\u1ea1t th\u00f3c\u201d ph\u1ea3i b\u0103ng qua \u201cC\u00e1nh \u0111\u1ed3ng\u201d l\u1ea5y \u0111\u1ee7 b\u1ed1n th\u1ebb ch\u1eef \u1edf b\u1ed1n h\u1ed9p \u201cM\u1eb7t Tr\u1eddi\u201d, \u201cKh\u00f4ng kh\u00ed\u201d, \u201cN\u01b0\u1edbc\u201d, \u201cCh\u1ea5t kho\u00e1ng\u201d. N\u1ebfu trong qu\u00e1 tr\u00ecnh b\u0103ng qua \u201cC\u00e1nh \u0111\u1ed3ng\u201d m\u00e0 \u201cH\u1ea1t th\u00f3c\u201d b\u1ecb \u201cChim s\u1ebb\u201d b\u1eaft \u0111\u01b0\u1ee3c th\u00ec b\u1ecb lo\u1ea1i kh\u1ecfi cu\u1ed9c ch\u01a1i. \u201cH\u1ea1t th\u00f3c\u201d c\u0169ng nh\u01b0 \u201cChim s\u1ebb\u201d ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e9p nh\u1ea3y hai ch\u00e2n c\u00f9ng l\u00fac \u0111\u1ec3 di chuy\u1ec3n, kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p ch\u1ea1y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n. \u2013 GV t\u1ed5 ch\u1ee9c cho HS ch\u01a1i l\u1ea7n l\u01b0\u1ee3t theo nh\u00f3m. GV c\u00f3 th\u1ec3 tri\u1ec3n khai theo c\u00e1ch: \u1edf l\u01b0\u1ee3t ch\u01a1i sau s\u1ebd gi\u1ea3m s\u1ed1 th\u1ebb \u201cN\u01b0\u1edbc\u201d \u00edt l\u1ea1i c\u00f2n 1\/2 s\u1ed1 th\u1ebb ban \u0111\u1ea7u nh\u1eb1m m\u1ee5c \u0111\u00edch nh\u1ea5n m\u1ea1nh vai tr\u00f2 quan tr\u1ecdng c\u1ee7a n\u01b0\u1edbc \u0111\u1ed1i v\u1edbi c\u00e2y tr\u1ed3ng, ngu\u1ed3n n\u01b0\u1edbc ng\u00e0y c\u00e0ng c\u1ea1n ki\u1ec7t v\u00e0 th\u1eddi ti\u1ebft ng\u00e0y c\u00e0ng kh\u00f4 h\u1ea1n \u0111\u1ec3 l\u1ed3ng gh\u00e9p gi\u00e1o d\u1ee5c HS \u00fd th\u1ee9c b\u1ea3o v\u1ec7 ngu\u1ed3n n\u01b0\u1edbc cho c\u00e2y xanh, ti\u1ebft ki\u1ec7m n\u01b0\u1edbc v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng s\u1ed1ng. \u2013 GV c\u0169ng c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c l\u01b0\u1ee3t ch\u01a1i ti\u1ebfp theo b\u1eb1ng c\u00e1ch ch\u1ec9 d\u00f9ng ba h\u1ed9p \u201cM\u1eb7t Tr\u1eddi\u201d, \u201cKh\u00f4ng kh\u00ed\u201d, \u201cN\u01b0\u1edbc\u201d, \u0111\u1ec3 nh\u1ea5n m\u1ea1nh t\u1ea7m quan tr\u1ecdng c\u1ee7a c\u00e1c y\u1ebfu t\u1ed1: \u00e1nh s\u00e1ng, n\u01b0\u1edbc v\u00e0 kh\u00f4ng kh\u00ed tham gia v\u00e0o qu\u00e1 tr\u00ecnh quang h\u1ee3p c\u1ee7a c\u00e2y xanh. \u2013 Sau khi tr\u00f2 ch\u01a1i k\u1ebft th\u00fac, GV c\u00f3 th\u1ec3 \u0111\u1eb7t c\u00e1c c\u00e2u h\u1ecfi ph\u1ee5 \u0111\u1ec3 c\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c v\u1ec1 t\u1ea7m quan tr\u1ecdng c\u1ee7a c\u00e1c y\u1ebfu t\u1ed1: \u00e1nh s\u00e1ng, n\u01b0\u1edbc, kh\u00f4ng kh\u00ed v\u00e0 ch\u1ea5t kho\u00e1ng \u0111\u1ed1i v\u1edbi s\u1ef1 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e2y xanh (c\u1ee5 th\u1ec3, trong tr\u00f2 ch\u01a1i n\u00e0y l\u00e0 h\u1ea1t th\u00f3c s\u1ebd c\u1ea7n c\u00e1c y\u1ebfu t\u1ed1 \u0111\u00f3 \u0111\u1ec3 n\u1ea3y m\u1ea7m th\u00e0nh c\u00e2y l\u00faa): + Trong tr\u00f2 ch\u01a1i n\u00e0y, \u0111\u00e3 c\u00f3 bao nhi\u00eau h\u1ea1t th\u00f3c t\u1ed3n t\u1ea1i \u0111\u01b0\u1ee3c v\u00e0 n\u1ea3y m\u1ea7m th\u00e0nh c\u00e2y l\u00faa? + \u0110\u00e3 c\u00f3 bao nhi\u00eau h\u1ea1t th\u00f3c kh\u00f4ng th\u1ec3 s\u1ed1ng \u0111\u1ec3 n\u1ea3y m\u1ea7m? V\u00ec sao? + \u0110\u1ec3 c\u00e2y l\u00faa s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n b\u00ecnh th\u01b0\u1eddng c\u00f3 th\u1ec3 thi\u1ebfu m\u1ed9t trong c\u00e1c y\u1ebfu t\u1ed1 \u00e1nh s\u00e1ng, kh\u00f4ng kh\u00ed, n\u01b0\u1edbc v\u00e0 ch\u1ea5t kho\u00e1ng \u0111\u01b0\u1ee3c kh\u00f4ng? V\u00ec sao? \u2013 HS tr\u1ea3 l\u1eddi. GV nh\u1eadn x\u00e9t v\u00e0 r\u00fat ra k\u1ebft lu\u1eadn. 100","* K\u1ebft lu\u1eadn: C\u00e2y xanh c\u1ea7n \u00e1nh s\u00e1ng, n\u01b0\u1edbc, kh\u00f4ng kh\u00ed, ch\u1ea5t kho\u00e1ng v\u00e0 nhi\u1ec7t \u0111\u1ed9 th\u00edch h\u1ee3p \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. \u2013 GV y\u00eau c\u1ea7u HS \u0111\u1ecdc n\u1ed9i dung trong m\u1ee5c Em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c \u1edf cu\u1ed1i trang 62 SGK. \u2013 GV d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c t\u1eeb kho\u00e1 c\u1ee7a b\u00e0i: Ch\u1ea5t kho\u00e1ng. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 th\u1ef1c hi\u1ec7n theo d\u00f5i v\u00e0 ch\u0103m s\u00f3c c\u00e1c c\u00e2y xanh tr\u1ed3ng trong ch\u1eadu \u1edf nh\u00e0 b\u1eb1ng c\u00e1c h\u00e0nh \u0111\u1ed9ng nh\u01b0: t\u01b0\u1edbi n\u01b0\u1edbc cho c\u00e2y, \u0111\u1eb7t c\u00e2y \u1edf n\u01a1i c\u00f3 \u00e1nh s\u00e1ng v\u00e0 kh\u00f4ng kh\u00ed tho\u00e1ng m\u00e1t, b\u00f3n ph\u00e2n cho c\u00e2y theo \u0111\u1ecbnh k\u00ec. B\u00e0i 16. nhu c\u1ea7u s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt (3 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2212 \u0110u\u031ba ra \u0111u\u031b\u01a1\u0323c d\u00e2\u0303n ch\u01b0\u0301ng cho th\u00e2\u0301y \u0111\u1ecd\u0302ng v\u1ea1\u0302t c\u00e2\u0300n a\u0301nh sa\u0301ng, kho\u0302ng khi\u0301, nu\u031b\u01a1\u0301c, nhi\u1eb9\u0302t \u0111\u1ecd\u0302 va\u0300 th\u01b0\u0301c a\u0306n \u0111\u00ea\u0309 s\u00f4\u0301ng va\u0300 pha\u0301t tri\u00ea\u0309n. \u2212 Tri\u0300nh ba\u0300y \u0111u\u031b\u01a1\u0323c \u0111\u1ecd\u0302ng v\u1ea1\u0302t kho\u0302ng t\u01b0\u0323 t\u00f4\u0309ng h\u01a1\u0323p \u0111u\u031b\u01a1\u0323c ca\u0301c ch\u00e2\u0301t dinh du\u031b\u01a1\u0303ng, pha\u0309i s\u01b0\u0309 du\u0323ng ca\u0301c ch\u00e2\u0301t dinh du\u031b\u01a1\u0303ng cu\u0309a th\u01b0\u0323c v\u1ea1\u0302t va\u0300 \u0111\u1ecd\u0302ng v\u1ea1\u0302t kha\u0301c \u0111\u00ea\u0309 s\u00f4\u0301ng va\u0300 pha\u0301t tri\u00ea\u0309n. \u2212 Ve\u0303 \u0111u\u031b\u01a1\u0323c so\u031b \u0111\u00f4\u0300 \u0111o\u031bn gia\u0309n (ho\u1ea1\u0306c \u0111i\u00ea\u0300n va\u0300o so\u031b \u0111\u00f4\u0300 cho tru\u031b\u01a1\u0301c) v\u00ea\u0300 s\u01b0\u0323 trao \u0111\u00f4\u0309i khi\u0301, nu\u031b\u01a1\u0301c, th\u01b0\u0301c a\u0306n cu\u0309a \u0111\u1ecd\u0302ng v\u1ea1\u0302t v\u01a1\u0301i mo\u0302i tru\u031b\u01a1\u0300ng. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 16 SGK, phi\u1ebfu h\u1ecdc t\u1eadp trang 64 SGK. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 nh\u1eefng y\u1ebfu t\u1ed1 c\u1ea7n cho \u0111\u1ed9ng v\u1eadt s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan s\u00e1t h\u00ecnh 1 (SGK, trang 63) ho\u1eb7c c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c tranh v\u1ebd, video kh\u00e1c c\u00f3 n\u1ed9i dung t\u01b0\u01a1ng t\u1ef1 \u0111\u1ec3 t\u1ed5 ch\u1ee9c ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: Con chu\u1ed9t \u1edf h\u00ecnh 1 c\u1ea7n nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n? 101","\u2013 GV m\u1eddi 2 \u2013 3 HS b\u1ea5t k\u00ec tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. \u2013 D\u1ef1a v\u00e0o th\u1ef1c t\u1ebf c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS, GV ghi ch\u00fa m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 c\u00f3 li\u00ean quan l\u00ean b\u1ea3ng. GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cNhu c\u1ea7u s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: Ca\u0301c y\u00ea\u0301u t\u1ed1 c\u1ea7n cho s\u1ef1 s\u1ed1ng va\u0300 pha\u0301t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1ea1\u0302t * M\u1ee5c ti\u00eau: HS nh\u1ea1\u0302n bi\u00ea\u0301t \u0111u\u031b\u01a1\u0323c ca\u0301c y\u00ea\u0301u t\u00f4\u0301 c\u00e2\u0300n cho s\u01b0\u0323 s\u00f4\u0301ng va\u0300 pha\u0301t tri\u00ea\u0309n cu\u0309a \u0111\u1ed9ng v\u1ea1\u0302t (a\u0301nh sa\u0301ng, kho\u0302ng khi\u0301, nu\u031b\u01a1\u0301c, th\u1ee9c \u0103n) tho\u0302ng qua thi\u0301 nghi\u1eb9\u0302m ho\u1ea1\u0306c quan sa\u0301t tranh a\u0309nh, video clip. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c theo nh\u00f3m 2, quan s\u00e1t h\u00ecnh 2 (\u0111\u1ed1i ch\u1ee9ng) v\u00e0 c\u00e1c h\u00ecnh 3, 4, 5, 6 (th\u00ed nghi\u1ec7m) \u0111\u1ec3 ho\u00e0n th\u00e0nh phi\u1ebfu h\u1ecdc t\u1eadp theo g\u1ee3i \u00fd \u1edf trang 64 SGK. \u2013 GV c\u00f3 th\u1ec3 \u0111\u1eb7t th\u00eam c\u00e2u h\u1ecfi g\u1ee3i \u00fd \u0111\u1ec3 HS quan s\u00e1t v\u00e0 l\u1ea5y \u0111\u01b0\u1ee3c th\u00f4ng tin c\u1ea7n thi\u1ebft. GV c\u1ea7n l\u01b0u \u00fd v\u1edbi HS: T\u1ea5t c\u1ea3 c\u00e1c con chu\u1ed9t \u0111\u1ec1u \u0111\u01b0\u1ee3c s\u1ed1ng trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng th\u00edch h\u1ee3p. + H\u00ecnh 2 (\u0111\u1ed1i ch\u1ee9ng): Con chu\u1ed9t \u0111\u01b0\u1ee3c cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 th\u1ee9c \u0103n, n\u01b0\u1edbc u\u1ed1ng, kh\u00f4ng kh\u00ed v\u00e0 \u00e1nh s\u00e1ng. + H\u00ecnh 3 (th\u00ed nghi\u1ec7m \u0111i\u1ec1u ki\u1ec7n kh\u00f4ng c\u00f3 th\u1ee9c \u0103n): Con chu\u1ed9t \u0111\u01b0\u1ee3c th\u00ed nghi\u1ec7m trong \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng, n\u01b0\u1edbc v\u00e0 kh\u00f4ng kh\u00ed b\u00ecnh th\u01b0\u1eddng, ch\u1ec9 thi\u1ebfu th\u1ee9c \u0103n. + H\u00ecnh 4: Con chu\u1ed9t kh\u00f4ng th\u1ec3 trao \u0111\u1ed5i kh\u00ed v\u1edbi m\u00f4i tr\u01b0\u1eddng v\u00ec chi\u1ebfc h\u1ed9p \u0111\u00e3 \u0111\u01b0\u1ee3c b\u00edt k\u00edn. C\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c b\u00ecnh th\u01b0\u1eddng. + H\u00ecnh 5: Con chu\u1ed9t thi\u1ebfu n\u01b0\u1edbc u\u1ed1ng; c\u00f2n c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c b\u00ecnh th\u01b0\u1eddng. + H\u00ecnh 6: Con chu\u1ed9t thi\u1ebfu \u00e1nh s\u00e1ng. C\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c b\u00ecnh th\u01b0\u1eddng. \u2013 GV m\u1eddi 4 \u2013 5 HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp c\u00e1c th\u00f4ng tin \u0111\u00e3 \u0111i\u1ec1n v\u00e0o phi\u1ebfu h\u1ecdc t\u1eadp v\u1ec1 k\u1ebft qu\u1ea3 quan s\u00e1t con chu\u1ed9t \u0111\u1ed1i ch\u1ee9ng (h\u00ecnh 2) v\u00e0 c\u00e1c con chu\u1ed9t th\u00ed nghi\u1ec7m (h\u00ecnh 3, 4, 5, 6). K\u1ebft qu\u1ea3 quan s\u00e1t \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch l\u1ed3ng gh\u00e9p v\u1edbi c\u00e1c c\u00e2u h\u1ecfi \u1edf tr\u00ean theo tr\u00ecnh t\u1ef1 th\u00ed nghi\u1ec7m t\u1eeb tr\u00ean xu\u1ed1ng. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau d\u01b0\u1edbi s\u1ef1 \u0111i\u1ec1u khi\u1ec3n c\u1ee7a GV. \u2013 GV nh\u1eadn x\u00e9t, k\u1ebft lu\u1eadn v\u00e0 th\u1ed1ng nh\u1ea5t chung cho c\u1ea3 l\u1edbp \u0111\u1ec3 ho\u00e0n thi\u1ec7n phi\u1ebfu h\u1ecdc t\u1eadp. G\u1ee3i \u00fd: PHI\u1ebeU H\u1eccC T\u1eacP H\u00ecnh N\u01b0\u1edbc Kh\u00f4ng kh\u00ed Th\u1ee9c \u0103n \u00c1nh s\u00e1ng Nh\u1eadn x\u00e9t 2 C\u00f3 C\u00f3 C\u00f3 C\u00f3 \u0110i\u1ec1u ki\u1ec7n s\u1ed1ng \u0111\u1ea7y \u0111\u1ee7. 3 C\u00f3 C\u00f3 Kh\u00f4ng C\u00f3 \u0110i\u1ec1u ki\u1ec7n s\u1ed1ng thi\u1ebfu th\u1ee9c \u0103n. 102","4 C\u00f3 Kh\u00f4ng C\u00f3 C\u00f3 \u0110i\u1ec1u ki\u1ec7n s\u1ed1ng thi\u1ebfu kh\u00f4ng kh\u00ed. 5 Kh\u00f4ng C\u00f3 C\u00f3 C\u00f3 \u0110i\u1ec1u ki\u1ec7n s\u1ed1ng thi\u1ebfu n\u01b0\u1edbc. 6 C\u00f3 C\u00f3 C\u00f3 Kh\u00f4ng \u0110i\u1ec1u ki\u1ec7n s\u1ed1ng thi\u1ebfu \u00e1nh s\u00e1ng. \u2013 Sau khi c\u1ea3 l\u1edbp ho\u00e0n th\u00e0nh phi\u1ebfu h\u1ecdc t\u1eadp, GV y\u00eau c\u1ea7u HS: D\u1ef1 \u0111o\u00e1n kh\u1ea3 n\u0103ng duy tr\u00ec s\u1ef1 s\u1ed1ng c\u1ee7a c\u00e1c con chu\u1ed9t trong m\u1ed7i h\u00ecnh. Gi\u1ea3i th\u00edch. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: \u0110\u1ec3 \u0111\u1ed9ng v\u1eadt c\u00f3 th\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n, ch\u00fang c\u1ea7n nh\u1eefng \u0111i\u1ec1u ki\u1ec7n n\u00e0o? \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi t\u01b0\u01a1ng \u1ee9ng cho m\u1ed7i h\u00ecnh v\u00e0 gi\u1ea3i th\u00edch. Sau \u0111\u00f3, GV ti\u1ebfp t\u1ee5c \u0111\u1eb7t c\u00e2u h\u1ecfi \u0111\u1ec3 ch\u1ed1t l\u1ea1i nh\u1eefng y\u1ebfu t\u1ed1 m\u00e0 \u0111\u1ed9ng v\u1eadt c\u1ea7n \u0111\u1ec3 c\u00f3 th\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. G\u1ee3i \u00fd: + Con chu\u1ed9t \u1edf c\u00e1c h\u00ecnh 3, 4, 5, 6 thi\u1ebfu \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng t\u01b0\u01a1ng \u1ee9ng l\u00e0: th\u1ee9c \u0103n, kh\u00f4ng kh\u00ed, n\u01b0\u1edbc, \u00e1nh s\u00e1ng n\u00ean kh\u00f4ng th\u1ec3 duy tr\u00ec s\u1ef1 s\u1ed1ng \u0111\u01b0\u1ee3c l\u00e2u. Trong \u0111\u00f3, con chu\u1ed9t thi\u1ebfu kh\u00f4ng kh\u00ed, thi\u1ebfu n\u01b0\u1edbc (h\u00ecnh 4, 5) s\u1ebd ch\u1ebft nhanh h\u01a1n v\u00ec kh\u00f4ng kh\u00ed v\u00e0 n\u01b0\u1edbc l\u00e0 c\u00e1c y\u1ebfu t\u1ed1 r\u1ea5t c\u1ea7n thi\u1ebft cho s\u1ef1 s\u1ed1ng. * K\u1ebft lu\u1eadn: \u0110\u1ed9ng v\u1eadt c\u1ea7n \u0111\u1ee7 n\u01b0\u1edbc, kh\u00f4ng kh\u00ed, th\u1ee9c \u0103n, \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi, nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng th\u00edch h\u1ee3p \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. Ho\u1ea1t \u0111\u1ed9ng 2: T\u00ecm hi\u1ec3u \u0111\u1ed9ng v\u1eadt c\u1ea7n nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng th\u00edch h\u1ee3p \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n * M\u1ee5c ti\u00eau: HS nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c \u0111\u1ed9ng v\u1eadt c\u1ea7n nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng th\u00edch h\u1ee3p \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan s\u00e1t h\u00ecnh 7 v\u00e0 8, \u0111\u1ecdc th\u00f4ng tin \u1edf m\u1ee5c Em t\u00ecm hi\u1ec3u th\u00eam (SGK, trang 64) v\u00e0 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra \u0111\u1ed1i v\u1edbi nh\u1eefng \u0111\u1ed9ng v\u1eadt trong h\u00ecnh 7 v\u00e0 8? \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi cho t\u1eebng h\u00ecnh \u1ea3nh v\u00e0 gi\u1ea3i th\u00edch. G\u1ee3i \u00fd: + H\u00ecnh 7: Con ng\u1ef1a s\u1ed1ng trong \u0111i\u1ec1u ki\u1ec7n l\u1ea1nh gi\u00e1, n\u1ebfu nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng ch\u1ecbu \u0111\u1ef1ng c\u1ee7a con ng\u1ef1a k\u00e9o d\u00e0i th\u00ec s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a con ng\u1ef1a v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ch\u1ebft. + H\u00ecnh 8: Nh\u1eefng con b\u00f2 s\u1ed1ng trong \u0111i\u1ec1u ki\u1ec7n n\u1eafng n\u00f3ng, kh\u00f4 h\u1ea1n k\u00e9o d\u00e0i, n\u1ebfu nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng cao v\u01b0\u1ee3t ng\u01b0\u1ee1ng ch\u1ecbu \u0111\u1ef1ng c\u1ee7a con b\u00f2 k\u00e9o d\u00e0i s\u1ebd l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a con b\u00f2 v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ch\u1ebft. \u2013 GV y\u00eau c\u1ea7u HS: H\u00e3y l\u1ea5y m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 \u0111\u1ed9ng v\u1eadt c\u1ea7n nhi\u1ec7t \u0111\u1ed9 th\u00edch h\u1ee3p \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi v\u00e0 \u0111\u01b0a ra n\u1ed9i dung gi\u1ea3i th\u00edch h\u1ee3p l\u00ed. N\u1ebfu HS \u0111\u1ea7u ti\u00ean tr\u1ea3 l\u1eddi ch\u01b0a ch\u00ednh x\u00e1c th\u00ec g\u1ecdi c\u00e1c HS ti\u1ebfp theo. 103","Ho\u1ea1t \u0111\u1ed9ng 3: Luy\u1ec7n t\u1eadp * M\u1ee5c ti\u00eau: HS \u00f4n l\u1ea1i c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng s\u1ed1ng kh\u00f4ng \u0111\u1ea3m b\u1ea3o \u0111\u1ec3 \u0111\u1ed9ng v\u1eadt s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. Bi\u1ebft li\u00ean h\u1ec7 th\u1ef1c t\u1ebf t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng \u0111\u1ec3 n\u00eau v\u00ed d\u1ee5. HS v\u1eadn d\u1ee5ng ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u1ec3 gi\u1ea3i th\u00edch m\u1ed9t t\u00ecnh hu\u1ed1ng th\u1ef1c ti\u1ec5n trong \u0111\u1eddi s\u1ed1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS th\u1ea3o lu\u1eadn nh\u00f3m 4 \u0111\u1ec3 th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5: K\u1ec3 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 kh\u00f4ng \u0111\u1ea3m b\u1ea3o \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt x\u1ea3y ra \u1edf \u0111\u1ecba ph\u01b0\u01a1ng m\u00e0 em bi\u1ebft. \u2013 GV quan s\u00e1t, \u0111\u1eb7t th\u00eam c\u00e2u h\u1ecfi d\u1eabn d\u1eaft \u0111\u1ec3 h\u1ed7 tr\u1ee3 HS k\u1ec3 \u0111\u01b0\u1ee3c nhi\u1ec1u v\u00ed d\u1ee5. \u2013 GV m\u1eddi \u0111\u1ea1i di\u1ec7n 2 \u2013 3 nh\u00f3m chia s\u1ebb n\u1ed9i dung th\u1ea3o lu\u1eadn c\u1ee7a nh\u00f3m v\u1edbi c\u1ea3 l\u1edbp. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: V\u00ec sao trong h\u1ed3 nu\u00f4i t\u00f4m ng\u01b0\u1eddi ta th\u01b0\u1eddng g\u1eafn m\u00e1y s\u1ee5c kh\u00ed? \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi. GV nh\u1eadn x\u00e9t v\u00e0 ch\u1ed1t n\u1ed9i dung gi\u1ea3i th\u00edch. G\u1ee3i \u00fd: Ng\u01b0\u1eddi ta th\u01b0\u1eddng g\u1eafn m\u00e1y s\u1ee5c kh\u00ed trong c\u00e1c h\u1ed3 nu\u00f4i t\u00f4m \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o cung c\u1ea5p \u0111\u1ee7 kh\u00f4ng kh\u00ed cho t\u00f4m s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 s\u01b0u t\u1ea7m tranh, \u1ea3nh m\u1ed9t s\u1ed1 \u0111\u1ed9ng v\u1eadt v\u00e0 t\u00ecm hi\u1ec3u th\u1ee9c \u0103n c\u1ee7a ch\u00fang \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft h\u1ecdc sau. Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 th\u1ee9c \u0103n c\u1ee7a \u0111\u1ed9ng v\u1eadt. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV cho HS quan s\u00e1t h\u00ecnh \u1ea3nh ho\u1eb7c xem \u0111o\u1ea1n video clip v\u1ec1 m\u1ed9t lo\u00e0i \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt v\u00e0 m\u1ed9t lo\u00e0i \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: C\u00e1c con v\u1eadt n\u00e0y l\u1ea5y th\u1ee9c \u0103n t\u1eeb \u0111\u00e2u? Th\u1ee9c \u0103n c\u1ee7a ch\u00fang l\u00e0 g\u00ec? \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi. \u2013 HS tr\u1ea3 l\u1eddi theo s\u1ef1 hi\u1ec3u bi\u1ebft c\u1ee7a b\u1ea3n th\u00e2n. \u2013 GV nh\u1eadn x\u00e9t c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS. Th\u00f4ng qua c\u00e1c n\u1ed9i dung th\u1ea3o lu\u1eadn v\u1edbi HS, GV d\u1eabn d\u1eaft HS v\u00e0o ti\u1ebft 2 c\u1ee7a b\u00e0i h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u v\u1ec1 th\u1ee9c \u0103n c\u1ee7a \u0111\u1ed9ng v\u1eadt * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 tri\u0300nh ba\u0300y \u0111u\u031b\u01a1\u0323c \u0111\u1ecd\u0302ng v\u1ea1\u0302t kho\u0302ng t\u01b0\u0323 t\u00f4\u0309ng h\u01a1\u0323p \u0111u\u031b\u01a1\u0323c ca\u0301c ch\u00e2\u0301t dinh du\u031b\u01a1\u0303ng m\u00e0 pha\u0309i s\u01b0\u0309 du\u0323ng ca\u0301c ch\u00e2\u0301t dinh du\u031b\u01a1\u0303ng t\u1eeb th\u01b0\u0323c v\u1ea1\u0302t ho\u1eb7c \u0111\u1ecd\u0302ng v\u1ea1\u0302t kha\u0301c \u0111\u00ea\u0309 s\u00f4\u0301ng va\u0300 pha\u0301t tri\u00ea\u0309n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS l\u00e0m vi\u1ec7c nh\u00f3m \u0111\u00f4i. GV y\u00eau c\u1ea7u HS quan s\u00e1t c\u00e1c h\u00ecnh 9, 10, 11, 12, 13 (SGK, trang 65), th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: 104","+ C\u00e1c con v\u1eadt trong h\u00ecnh \u0111ang s\u1eed d\u1ee5ng nh\u1eefng th\u1ee9c \u0103n n\u00e0o? Th\u1ee9c \u0103n \u0111\u00f3 t\u1eeb \u0111\u1ed9ng v\u1eadt hay th\u1ef1c v\u1eadt? + D\u1ef1a v\u00e0o lo\u1ea1i th\u1ee9c \u0103n, c\u00f3 th\u1ec3 ph\u00e2n chia c\u00e1c \u0111\u1ed9ng v\u1eadt th\u00e0nh nh\u1eefng nh\u00f3m n\u00e0o? + Th\u1ee9c \u0103n c\u1ee7a \u0111\u1ed9ng v\u1eadt kh\u00e1c v\u1edbi \u201cth\u1ee9c \u0103n\u201d c\u1ee7a th\u1ef1c v\u1eadt nh\u01b0 th\u1ebf n\u00e0o? \u2013 GV h\u01b0\u1edbng d\u1eabn cho HS khai th\u00e1c c\u00e1c th\u00f4ng tin tr\u00ean h\u00ecnh v\u1ebd \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi. G\u1ee3i \u00fd: + H\u00ecnh 9: Th\u1ecf \u0103n c\u00e0 r\u1ed1t (ngu\u1ed3n g\u1ed1c th\u1ee9c \u0103n t\u1eeb th\u1ef1c v\u1eadt); H\u00ecnh 10: D\u00ea \u0103n c\u1ecf (ngu\u1ed3n g\u1ed1c th\u1ee9c \u0103n t\u1eeb th\u1ef1c v\u1eadt); C\u00e1 m\u1eadp \u0103n m\u1ed9t lo\u00e0i c\u00e1 nh\u1ecf kh\u00e1c (ngu\u1ed3n g\u1ed1c th\u1ee9c \u0103n t\u1eeb \u0111\u1ed9ng v\u1eadt); H\u00ecnh 12: R\u1eafn \u0103n \u1ebfch (ngu\u1ed3n g\u1ed1c th\u1ee9c \u0103n t\u1eeb \u0111\u1ed9ng v\u1eadt); G\u00e0 \u0103n l\u00faa (ngu\u1ed3n g\u1ed1c th\u1ee9c \u0103n t\u1eeb th\u1ef1c v\u1eadt) v\u00e0 \u0103n giun (ngu\u1ed3n g\u1ed1c th\u1ee9c \u0103n t\u1eeb \u0111\u1ed9ng v\u1eadt). + D\u1ef1a v\u00e0o lo\u1ea1i th\u1ee9c \u0103n, c\u00f3 th\u1ec3 ph\u00e2n chia c\u00e1c \u0111\u1ed9ng v\u1eadt th\u00e0nh 3 nh\u00f3m: \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt; \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt; \u0111\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt (c\u00f2n g\u1ecdi l\u00e0 \u0111\u1ed9ng v\u1eadt \u0103n t\u1ea1p). + \u0110\u1ed9ng v\u1eadt kh\u00f4ng th\u1ec3 t\u1ef1 t\u1ed5ng h\u1ee3p ch\u1ea5t dinh d\u01b0\u1ee1ng t\u1eeb n\u01b0\u1edbc v\u00e0 kh\u00ed c\u00e1c-b\u00f4-n\u00edc d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi nh\u01b0 th\u1ef1c v\u1eadt n\u00ean ch\u00fang ph\u1ea3i l\u1ea5y th\u1ee9c \u0103n t\u1eeb th\u1ef1c v\u1eadt ho\u1eb7c \u0111\u1ed9ng v\u1eadt kh\u00e1c. \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. \u2013 GV v\u00e0 HS nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: \u2022\t \u0110\u1ed9ng v\u1eadt kh\u00f4ng t\u1ef1 t\u1ed5ng h\u1ee3p \u0111\u01b0\u1ee3c c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng nh\u01b0 th\u1ef1c v\u1eadt. Do \u0111\u00f3, ch\u00fang ph\u1ea3i s\u1eed d\u1ee5ng th\u1ef1c v\u1eadt, \u0111\u1ed9ng v\u1eadt kh\u00e1c l\u00e0m th\u1ee9c \u0103n \u0111\u1ec3 t\u1ed5ng h\u1ee3p n\u00ean c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng c\u1ea7n thi\u1ebft cho c\u01a1 th\u1ec3. \u2022\t M\u1ed9t s\u1ed1 \u0111\u1ed9ng v\u1eadt ch\u1ec9 \u0103n th\u1ef1c v\u1eadt. M\u1ed9t s\u1ed1 \u0111\u1ed9ng v\u1eadt ch\u1ec9 \u0103n \u0111\u1ed9ng v\u1eadt. M\u1ed9t s\u1ed1 \u0111\u1ed9ng v\u1eadt c\u00f3 th\u1ec3 \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt (\u0111\u1ed9ng v\u1eadt \u0103n t\u1ea1p). Ho\u1ea1t \u0111\u1ed9ng 2: Luy\u1ec7n t\u1eadp * M\u1ee5c ti\u00eau: HS v\u1eadn d\u1ee5ng \u0111u\u031b\u01a1\u0323c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u1ec3 ph\u00e2n lo\u1ea1i \u0111\u1ed9ng v\u1eadt th\u00e0nh c\u00e1c nh\u00f3m d\u1ef1a theo lo\u1ea1i th\u1ee9c \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4. GV y\u00eau c\u1ea7u HS mang tranh, \u1ea3nh v\u1ec1 \u0111\u1ed9ng v\u1eadt \u0111\u00e3 s\u01b0u t\u1ea7m \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u00ean b\u00e0n (HS \u0111\u00e3 chu\u1ea9n b\u1ecb tr\u01b0\u1edbc). Trong tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng c\u00f3 h\u00ecnh \u1ea3nh s\u01b0u t\u1ea7m ho\u1eb7c h\u00ecnh \u1ea3nh kh\u00f4ng \u0111\u1ea3m b\u1ea3o t\u00ednh phong ph\u00fa th\u00ec GV c\u00f3 th\u1ec3 d\u00f9ng c\u00e1c h\u00ecnh \u1edf trang 64 SGK \u0111\u1ec3 t\u1ed5 ch\u1ee9c ho\u1ea1t \u0111\u1ed9ng cho HS. \u2013 GV giao nhi\u1ec7m v\u1ee5 cho c\u00e1c nh\u00f3m: + Quan s\u00e1t h\u00ecnh v\u00e0 cho bi\u1ebft th\u1ee9c \u0103n c\u1ee7a t\u1eebng lo\u00e0i \u0111\u1ed9ng v\u1eadt. + X\u1ebfp h\u00ecnh \u1ea3nh \u0111\u1ed9ng v\u1eadt s\u01b0u t\u1ea7m \u0111\u01b0\u1ee3c v\u00e0o c\u00e1c nh\u00f3m \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt, \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. + Chia s\u1ebb v\u1edbi b\u1ea1n v\u1ec1 s\u1ea3n ph\u1ea9m c\u1ee7a nh\u00f3m em. 105","\u2013 HS quan s\u00e1t h\u00ecnh, v\u1eadn d\u1ee5ng c\u00e1c hi\u1ec3u bi\u1ebft c\u00e1 nh\u00e2n \u0111\u1ec3 th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u c\u1ee7a GV. GV c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 cho HS \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p th\u1ee9c \u0103n c\u1ee7a \u0111\u1ed9ng v\u1eadt \u00edt ph\u1ed5 bi\u1ebfn. C\u1ea7n l\u01b0u \u00fd ch\u1ec9 h\u01b0\u1edbng \u0111\u1ebfn ch\u1ec9 ra t\u1eebng lo\u1ea1i \u0111\u1ed9ng v\u1eadt d\u00f9ng th\u1ee9c \u0103n th\u1ef1c v\u1eadt, \u0111\u1ed9ng v\u1eadt hay c\u1ea3 th\u1ef1c v\u1eadt l\u1eabn \u0111\u1ed9ng v\u1eadt. \u2013 GV c\u00f3 th\u1ec3 vi\u1ebft l\u00ean b\u1ea3ng t\u00ean c\u1ee7a 3 nh\u00f3m \u0111\u1ed9ng v\u1eadt: \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt, \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt, \u0111\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt sau \u0111\u00f3 y\u00eau c\u1ea7u 1 nh\u00f3m (2 HS) l\u00ean s\u1eafp x\u1ebfp c\u00e1c tranh, \u1ea3nh c\u00e1c con v\u1eadt v\u00e0o c\u00e1c nh\u00f3m b\u1eb1ng c\u00e1ch \u0111\u00ednh. Trong tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng h\u00ecnh \u1ea3nh g\u1ee3i \u00fd trong SGK th\u00ec GV c\u00f3 th\u1ec3 cho HS ghi t\u00ean c\u00e1c con v\u1eadt v\u00e0o d\u01b0\u1edbi t\u00ean 3 nh\u00f3m \u0111\u1ed9ng v\u1eadt m\u00e0 GV \u0111\u00e3 ghi s\u1eb5n. \u2013 GV m\u1eddi \u0111\u1ea1i di\u1ec7n nh\u00f3m tr\u00ecnh b\u00e0y \u00fd ki\u1ebfn v\u00e0 chia s\u1ebb v\u1edbi l\u1edbp. GV m\u1eddi 1 \u2013 2 HS kh\u00e1c nh\u1eadn x\u00e9t ph\u1ea7n tr\u00ecnh b\u00e0y c\u1ee7a b\u1ea1n. GV ch\u1ed1t ph\u01b0\u01a1ng \u00e1n \u0111\u00fang v\u00e0 y\u00eau c\u1ea7u HS vi\u1ebft v\u00e0o v\u1edf. G\u1ee3i \u00fd: + Nh\u00f3m \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt: s\u00f3c, voi, nai, v\u1eb9t, c\u00e1 tr\u1eafm c\u1ecf. + Nh\u00f3m \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt: g\u1ea5u. + Nh\u00f3m \u0111\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt: v\u1ecbt, l\u1ee3n, ch\u00f3. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu \u0111\u1ed9ng v\u1eadt thi\u1ebfu ngu\u1ed3n th\u1ee9c \u0103n trong m\u1ed9t th\u1eddi gian d\u00e0i? \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. G\u1ee3i \u00fd: N\u1ebfu \u0111\u1ed9ng v\u1eadt thi\u1ebfu ngu\u1ed3n th\u1ee9c \u0103n trong th\u1eddi gian d\u00e0i th\u00ec ch\u00fang s\u1ebd b\u1ecb thi\u1ebfu ch\u1ea5t dinh d\u01b0\u1ee1ng, g\u1ea7y y\u1ebfu v\u00e0 d\u1eabn \u0111\u1ebfn t\u1eed vong. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 th\u1ee9c \u0103n c\u1ee7a c\u00e1c lo\u00e0i \u0111\u1ed9ng v\u1eadt xung quanh v\u00e0 x\u1ebfp c\u00e1c con v\u1eadt n\u00e0y v\u00e0o 3 nh\u00f3m: \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt, \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt, \u0111\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. Ti\u1ebft 3 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i cho HS nh\u1eefng hi\u1ec3u bi\u1ebft ban \u0111\u1ea7u v\u1ec1 trao \u0111\u1ed5i kh\u00ed, n\u01b0\u1edbc, th\u1ee9c \u0103n gi\u1eefa \u0111\u1ed9ng v\u1eadt v\u1edbi m\u00f4i tr\u01b0\u1eddng \u0111\u1ec3 t\u1eeb \u0111\u00f3 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft h\u1ecdc m\u1edbi. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chi\u1ebfu h\u00ecnh \u1ea3nh v\u1ec1 m\u1ed9t con v\u1eadt b\u1ea5t k\u00ec (v\u00ed d\u1ee5 con th\u1ecf) v\u00e0 \u0111\u1eb7t c\u00e2u h\u1ecfi: Theo em, con th\u1ecf l\u1ea5y g\u00ec t\u1eeb m\u00f4i tr\u01b0\u1eddng v\u00e0 th\u1ea3i ra m\u00f4i tr\u01b0\u1eddng nh\u1eefng g\u00ec? \u2013 HS v\u1eadn d\u1ee5ng c\u00e1c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u1ec3 tr\u1ea3 l\u1eddi. \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi. GV cho HS tr\u1ea3 l\u1eddi t\u1ef1 do, kh\u00f4ng nh\u1eadn x\u00e9t \u0111\u00fang hay sai. GV ghi ch\u00fa l\u00ean b\u1ea3ng c\u00e1c c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS (\u0111\u1ec3 t\u1ed5 ch\u1ee9c cho ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp theo c\u1ee7a b\u00e0i h\u1ecdc) v\u00e0 d\u1eabn d\u1eaft HS v\u00e0o ti\u1ebft 3 c\u1ee7a b\u00e0i h\u1ecdc. 106","Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u s\u1ef1 trao \u0111\u1ed5i kh\u00ed, n\u01b0\u1edbc, th\u1ee9c \u0103n gi\u1eefa \u0111\u1ed9ng v\u1eadt v\u1edbi m\u00f4i tr\u01b0\u1eddng * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 \u0111i\u00ea\u0300n (ho\u1eb7c g\u1eafn th\u1ebb ch\u1eef) va\u0300o so\u031b \u0111\u00f4\u0300 cho tru\u031b\u01a1\u0301c v\u00ea\u0300 s\u01b0\u0323 trao \u0111\u00f4\u0309i khi\u0301, nu\u031b\u01a1\u0301c, ch\u00e2\u0301t khoa\u0301ng cu\u0309a \u0111\u1ed9ng v\u1ea1\u0302t v\u01a1\u0301i mo\u0302i tru\u031b\u01a1\u0300ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 6, ph\u00e1t cho m\u1ed7i nh\u00f3m c\u00e1c th\u1ebb ch\u1eef v\u00e0 h\u00ecnh \u1ea3nh s\u01a1 \u0111\u1ed3 khuy\u1ebft v\u1ec1 trao \u0111\u1ed5i ch\u1ea5t \u1edf \u0111\u1ed9ng v\u1eadt (k\u00edch th\u01b0\u1edbc kh\u1ed5 A3 do GV chu\u1ea9n b\u1ecb s\u1eb5n). C\u00e1c nh\u00f3m c\u00f3 th\u1eddi gian 5 ph\u00fat \u0111\u1ec3 suy ngh\u0129 v\u00e0 ho\u00e0n th\u00e0nh s\u01a1 \u0111\u1ed3 trao \u0111\u1ed5i ch\u1ea5t \u1edf \u0111\u1ed9ng v\u1eadt b\u1eb1ng c\u00e1ch gh\u00e9p th\u1ebb ch\u1eef v\u00e0o c\u00e1c v\u1ecb tr\u00ed c\u00f3 d\u1ea5u ch\u1ea5m h\u1ecfi tr\u00ean s\u01a1 \u0111\u1ed3. GV c\u0169ng c\u00f3 th\u1ec3 in s\u01a1 \u0111\u1ed3 tr\u00ean gi\u1ea5y kh\u1ed5 A4 v\u00e0 cho HS t\u1ef1 \u0111i\u1ec1n n\u1ed9i dung th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 c\u00f3 d\u1ea5u ch\u1ea5m h\u1ecfi tr\u00ean s\u01a1 \u0111\u1ed3. \u2013 GV theo d\u00f5i th\u1eddi gian, h\u1ed7 tr\u1ee3 c\u00e1c nh\u00f3m khi c\u1ea7n thi\u1ebft. GV ra t\u00edn hi\u1ec7u k\u1ebft th\u00fac sau khi h\u1ebft th\u1eddi gian 5 ph\u00fat. \u2013 GV t\u1ed5 ch\u1ee9c cho c\u00e1c nh\u00f3m l\u00ean chia s\u1ebb k\u1ebft qu\u1ea3 c\u1ee7a nh\u00f3m m\u00ecnh. GV ch\u1ecdn theo th\u1ee9 t\u1ef1: c\u00e1c nh\u00f3m l\u00e0m sai l\u00ean tr\u00ecnh b\u00e0y tr\u01b0\u1edbc, nh\u00f3m l\u00e0m \u0111\u00fang tr\u00ecnh b\u00e0y sau c\u00f9ng. \u2013 GV theo d\u00f5i, \u0111i\u1ec1u khi\u1ec3n qu\u00e1 tr\u00ecnh chia s\u1ebb c\u1ee7a HS. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV v\u00e0 HS c\u00f9ng nhau nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn v\u1ec1 s\u01a1 \u0111\u1ed3 \u0111\u00fang. G\u1ee3i \u00fd: \u0110\u1ed9ng v\u1eadt l\u1ea5y v\u00e0o: th\u1ee9c \u0103n, n\u01b0\u1edbc, kh\u00ed \u00f4-xi; \u0110\u1ed9ng v\u1eadt th\u1ea3i ra: ch\u1ea5t th\u1ea3i, n\u01b0\u1edbc ti\u1ec3u, kh\u00ed c\u00e1c-b\u00f4-n\u00edc. *K\u1ebft lu\u1eadn: Trong qu\u00e1 tr\u00ecnh s\u1ed1ng, \u0111\u1ed9ng v\u1eadt l\u1ea5y t\u1eeb m\u00f4i tr\u01b0\u1eddng v\u00e0o c\u01a1 th\u1ec3 kh\u00ed \u00f4-xi, n\u01b0\u1edbc, th\u1ee9c \u0103n v\u00e0 th\u1ea3i ra m\u00f4i tr\u01b0\u1eddng kh\u00ed c\u00e1c-b\u00f4-n\u00edc, ch\u1ea5t th\u1ea3i, n\u01b0\u1edbc ti\u1ec3u. Ho\u1ea1t \u0111\u1ed9ng 2: V\u1ebd s\u01a1 \u0111\u1ed3 m\u00f4 t\u1ea3 s\u1ef1 trao \u0111\u1ed5i kh\u00ed, n\u01b0\u1edbc v\u00e0 th\u1ee9c \u0103n c\u1ee7a m\u1ed9t \u0111\u1ed9ng v\u1eadt * M\u1ee5c ti\u00eau: HS \u00f4n l\u1ea1i ki\u1ebfn th\u1ee9c v\u1ec1 s\u1ef1 trao \u0111\u1ed5i ch\u1ea5t \u1edf \u0111\u1ed9ng v\u1eadt v\u00e0 luy\u1ec7n t\u1eadp v\u1ebd s\u01a1 \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n m\u00f4 t\u1ea3 s\u1ef1 trao \u0111\u1ed5i kh\u00ed, n\u01b0\u1edbc v\u00e0 th\u1ee9c \u0103n c\u1ee7a m\u1ed9t con v\u1eadt m\u00e0 HS y\u00eau th\u00edch. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS ho\u1ea1t \u0111\u1ed9ng c\u00e1 nh\u00e2n. \u2013 GV y\u00eau c\u1ea7u HS v\u1ebd s\u01a1 \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n v\u1ec1 s\u1ef1 trao \u0111\u1ed5i kh\u00ed, n\u01b0\u1edbc v\u00e0 th\u1ee9c \u0103n c\u1ee7a m\u1ed9t con v\u1eadt m\u00e0 HS y\u00eau th\u00edch. \u0110\u1ed1i v\u1edbi th\u1ee9c \u0103n c\u1ee7a con v\u1eadt, GV y\u00eau c\u1ea7u HS ghi r\u00f5 con v\u1eadt \u0103n g\u00ec, l\u00e0 \u0111\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt, \u0111\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt hay \u0111\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. GV khuy\u1ebfn kh\u00edch HS v\u1ebd h\u00ecnh con v\u1eadt v\u00e0 thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 sao cho khoa h\u1ecdc v\u00e0 \u0111\u1eb9p. \u2013 GV t\u1ed5 ch\u1ee9c cho HS chia s\u1ebb s\u1ea3n ph\u1ea9m c\u1ee7a m\u00ecnh v\u1edbi c\u1ea3 l\u1edbp. GV m\u1eddi m\u1ed9t s\u1ed1 HS kh\u00e1c nh\u1eadn x\u00e9t s\u1ea3n ph\u1ea9m c\u1ee7a b\u1ea1n. L\u01b0u \u00fd: GV c\u0169ng c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c d\u01b0\u1edbi d\u1ea1ng ho\u1ea1t \u0111\u1ed9ng thi v\u1ebd v\u00e0 trang tr\u00ed s\u01a1 \u0111\u1ed3 gi\u1eefa c\u00e1c nh\u00f3m. Nh\u00f3m \u0111\u01b0\u1ee3c khen th\u01b0\u1edfng l\u00e0 nh\u00f3m c\u00f3 s\u1ea3n ph\u1ea9m \u0111\u1eb9p, n\u1ed9i dung \u0111\u00fang v\u00e0 \u0111\u01b0\u1ee3c c\u00e1c b\u1ea1n b\u00ecnh ch\u1ecdn nhi\u1ec1u nh\u1ea5t. Ho\u1ea1t \u0111\u1ed9ng 3: V\u1eadn d\u1ee5ng * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c c\u00e1c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u1ec3 tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi trong m\u1ed9t t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf. 107","* C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS th\u1ea3o lu\u1eadn theo nh\u00f3m 4. HS quan s\u00e1t h\u00ecnh 23 (SGK, trang 67), th\u1ea3o lu\u1eadn v\u00e0 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: + Vi\u1ec7c tr\u1ed3ng th\u00eam rong ho\u1eb7c c\u00e2y thu\u1ef7 sinh trong b\u1ec3 c\u00e1 c\u1ea3nh c\u00f3 t\u00e1c d\u1ee5ng g\u00ec? + V\u00ec sao c\u1ea7n \u0111\u00e8n chi\u1ebfu s\u00e1ng cho b\u1ec3 c\u00e1 c\u1ea3nh? + V\u00ec sao c\u1ea7n ph\u1ea3i l\u1eafp m\u00e1y s\u1ee5c kh\u00ed \u00f4-xi cho b\u1ec3 c\u00e1 c\u1ea3nh? + N\u1ebfu kh\u00f4ng cho c\u00e1 \u0103n th\u00ec c\u00e1c con c\u00e1 trong b\u1ec3 s\u1ebd nh\u01b0 th\u1ebf n\u00e0o? Gi\u1ea3i th\u00edch. + \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu kh\u00f4ng th\u01b0\u1eddng xuy\u00ean thay n\u01b0\u1edbc cho b\u1ec3 c\u00e1? \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS \u0111\u1ea1i di\u1ec7n nh\u00f3m tr\u1ea3 l\u1eddi l\u1ea7n l\u01b0\u1ee3t c\u00e1c c\u00e2u h\u1ecfi. C\u00e1c HS kh\u00e1c l\u1eafng nghe, nh\u1eadn x\u00e9t, b\u1ed5 sung. G\u1ee3i \u00fd: + Vi\u1ec7c tr\u1ed3ng th\u00eam rong ho\u1eb7c c\u00e2y thu\u1ef7 sinh trong b\u1ec3 c\u00e1 c\u1ea3nh c\u00f3 t\u00e1c d\u1ee5ng gi\u00fap b\u1ed5 sung kh\u00ed \u00f4-xi cho m\u00f4i tr\u01b0\u1eddng n\u01b0\u1edbc v\u00ec rong ho\u1eb7c c\u00e2y thu\u1ef7 sinh c\u00f3 kh\u1ea3 n\u0103ng quang h\u1ee3p v\u00e0 th\u1ea3i ra m\u00f4i tr\u01b0\u1eddng n\u01b0\u1edbc kh\u00ed \u00f4-xi. Ngo\u00e0i ra, c\u00e2y thu\u1ef7 sinh ho\u1eb7c rong l\u00e0m trong l\u00e0nh m\u00f4i tr\u01b0\u1eddng n\u01b0\u1edbc trong b\u1ec3 c\u00e1 do ch\u00fang s\u1eed d\u1ee5ng ch\u1ea5t th\u1ea3i c\u1ee7a c\u00e1 \u0111\u1ec3 l\u00e0m ngu\u1ed3n dinh d\u01b0\u1ee1ng cho qu\u00e1 tr\u00ecnh s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. + C\u1ea7n \u0111\u00e8n chi\u1ebfu s\u00e1ng cho b\u1ec3 c\u00e1 c\u1ea3nh \u0111\u1ec3 cung c\u1ea5p th\u00eam \u00e1nh s\u00e1ng \u0111\u1ee7 cho rong ho\u1eb7c c\u00e2y thu\u1ef7 sinh quang h\u1ee3p, \u0111\u1eb7c bi\u1ec7t r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi c\u00e1c b\u1ec3 c\u00e1 c\u1ea3nh \u0111\u1ec3 trong nh\u00e0 b\u1ecb thi\u1ebfu \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi. + C\u1ea7n ph\u1ea3i l\u1eafp m\u00e1y s\u1ee5c kh\u00ed \u00f4-xi cho b\u1ec3 c\u00e1 c\u1ea3nh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o cung c\u1ea5p \u0111\u1ee7 kh\u00f4ng kh\u00ed cho c\u00e1 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. + N\u1ebfu kh\u00f4ng cho c\u00e1 \u0103n th\u00ec c\u00e1c con c\u00e1 trong b\u1ec3 s\u1ebd kh\u00f4ng c\u00f3 ch\u1ea5t dinh d\u01b0\u1ee1ng \u0111\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. N\u1ebfu kh\u00f4ng cho c\u00e1 \u0103n trong m\u1ed9t th\u1eddi gian d\u00e0i th\u00ec c\u00e1 s\u1ebd ch\u1ebft. V\u00ec b\u1ec3 c\u00e1 c\u1ea3nh l\u00e0 m\u00f4i tr\u01b0\u1eddng nh\u00e2n t\u1ea1o, kh\u00f4ng c\u00f3 s\u1eb5n ngu\u1ed3n th\u1ee9c \u0103n t\u1ef1 nhi\u00ean. N\u1ebfu kh\u00f4ng b\u1ed5 sung th\u1ee9c \u0103n, c\u00e1 trong b\u1ec3 s\u1ebd thi\u1ebfu th\u1ee9c \u0103n v\u00e0 d\u1eabn \u0111\u1ebfn t\u1eed vong n\u1ebfu k\u00e9o d\u00e0i t\u00ecnh tr\u1ea1ng n\u00e0y. + N\u1ebfu kh\u00f4ng th\u01b0\u1eddng xuy\u00ean thay n\u01b0\u1edbc cho b\u1ec3 c\u00e1 th\u00ec b\u1ec3 c\u00e1 b\u1ecb b\u1ea9n do ch\u1ea5t th\u1ea3i c\u1ee7a c\u00e1, do th\u1ee9c \u0103n th\u1eeba l\u00e2u ng\u00e0y s\u1ebd l\u00e0m \u00f4 nhi\u1ec5m m\u00f4i tr\u01b0\u1eddng n\u01b0\u1edbc trong b\u1ec3 c\u00e1. \u2013 GV d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c t\u1eeb kho\u00e1 c\u1ee7a b\u00e0i: \u0110\u1ed9ng v\u1eadt \u0103n th\u1ef1c v\u1eadt \u2013 \u0110\u1ed9ng v\u1eadt \u0103n \u0111\u1ed9ng v\u1eadt \u2013 \u0110\u1ed9ng v\u1eadt \u0103n c\u1ea3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 th\u1ef1c hi\u1ec7n vi\u1ec7c theo d\u00f5i v\u00e0 ch\u0103m s\u00f3c c\u00e1c \u0111\u1ed9ng v\u1eadt nu\u00f4i \u1edf nh\u00e0 b\u1eb1ng c\u00e1c h\u00e0nh \u0111\u1ed9ng thi\u1ebft th\u1ef1c nh\u01b0: cho con v\u1eadt \u0103n \u0111\u1ea7y \u0111\u1ee7, kh\u00f4ng \u0111\u1ec3 con v\u1eadt b\u1ecb \u0111\u00f3i; cho con v\u1eadt ra s\u01b0\u1edfi n\u1eafng, tr\u00e1nh gi\u00f3 r\u00e9t, tr\u00e1nh b\u1ecb m\u01b0a \u01b0\u1edbt; nu\u00f4i con v\u1eadt \u1edf n\u01a1i c\u00f3 kh\u00f4ng kh\u00ed tho\u00e1ng m\u00e1t, nhi\u1ec1u c\u00e2y xanh,\u2026 108","B\u00e0i 17. ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng v\u00e0 v\u1eadt nu\u00f4i (2 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2212 V\u1ea1\u0302n du\u0323ng \u0111u\u031b\u01a1\u0323c ki\u00ea\u0301n th\u01b0\u0301c v\u00ea\u0300 nhu c\u00e2\u0300u s\u00f4\u0301ng cu\u0309a th\u01b0\u0323c v\u1ea1\u0302t va\u0300 \u0111\u1ecd\u0302ng v\u1ea1\u0302t \u0111\u00ea\u0309 \u0111\u00ea\u0300 xu\u00e2\u0301t vi\u1eb9\u0302c la\u0300m cu\u0323 th\u00ea\u0309 trong cha\u0306m so\u0301c ca\u0302y tr\u00f4\u0300ng va\u0300 v\u1ea1\u0302t nuo\u0302i, gia\u0309i thi\u0301ch \u0111u\u031b\u01a1\u0323c ta\u0323i sao c\u00e2\u0300n pha\u0309i la\u0300m co\u0302ng vi\u1eb9\u0302c \u0111o\u0301. \u2212 Th\u01b0\u0323c hi\u1eb9\u0302n \u0111u\u031b\u01a1\u0323c vi\u1eb9\u0302c la\u0300m phu\u0300 h\u01a1\u0323p \u0111\u00ea\u0309 cha\u0306m so\u0301c ca\u0302y tr\u00f4\u0300ng (vi\u0301 du\u0323: tu\u031b\u01a1\u0301i nu\u031b\u01a1\u0301c, bo\u0301n pha\u0302n,...) va\u0300 v\u1ea1\u0302t nuo\u0302i \u01a1\u0309 nha\u0300. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 17 SGK. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 nh\u1eefng vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng m\u00e0 HS bi\u1ebft. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS: K\u1ec3 m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m m\u00e0 em \u0111\u00e3 th\u1ef1c hi\u1ec7n \u0111\u1ec3 ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng. \u2013 GV m\u1eddi 2 \u2013 3 HS b\u1ea5t k\u00ec tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. \u2013 D\u1ef1a v\u00e0o th\u1ef1c t\u1ebf c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS, GV ghi ch\u00fa l\u00ean b\u1ea3ng. GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cCh\u0103m s\u00f3c c\u00e2y tr\u1ed3ng v\u00e0 v\u1eadt nu\u00f4i\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u c\u00e1c vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng * M\u1ee5c ti\u00eau: HS nh\u1ea1\u0302n bi\u00ea\u0301t \u0111u\u031b\u01a1\u0323c m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c theo nh\u00f3m \u0111\u00f4i, quan s\u00e1t c\u00e1c h\u00ecnh 1, 2, 3, 4 (SGK, trang 68) v\u00e0 th\u00f4ng tin m\u1ee5c Em t\u00ecm hi\u1ec3u th\u00eam \u1edf trang 69 \u0111\u1ec3 th\u1ea3o lu\u1eadn nh\u00f3m v\u00e0 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: + Con ng\u01b0\u1eddi l\u00e0m nh\u1eefng vi\u1ec7c g\u00ec \u0111\u1ec3 ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng? Gi\u1ea3i th\u00edch v\u00ec sao c\u1ea7n ph\u1ea3i l\u00e0m c\u00e1c c\u00f4ng vi\u1ec7c \u0111\u00f3. + Em v\u00e0 gia \u0111\u00ecnh th\u01b0\u1eddng ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng b\u1eb1ng nh\u1eefng vi\u1ec7c l\u00e0m g\u00ec? \u2013 GV m\u1eddi 1 \u2013 2 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi t\u01b0\u01a1ng \u1ee9ng cho m\u1ed7i h\u00ecnh v\u00e0 gi\u1ea3i th\u00edch. 109","G\u1ee3i \u00fd: + H\u00ecnh 1: T\u01b0\u1edbi c\u00e2y. C\u1ea7n t\u01b0\u1edbi c\u00e2y \u0111\u1ec3 cung c\u1ea5p \u0111\u1ee7 n\u01b0\u1edbc cho c\u00e2y. + H\u00ecnh 2: Che ni l\u00f4ng cho v\u01b0\u1eddm \u01b0\u01a1m m\u1ea1 non \u0111\u1ec3 ch\u1ed1ng r\u00e9t cho c\u00e2y, b\u1ea3o v\u1ec7 m\u1ea1 non kh\u00f4ng b\u1ecb h\u01b0 h\u1ecfng. + H\u00ecnh 3: D\u00f9ng l\u01b0\u1edbi che n\u1eafng cho c\u00e2y khi th\u1eddi ti\u1ebft n\u1eafng n\u00f3ng \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e2y kh\u00f4ng b\u1ecb t\u00e1c \u0111\u1ed9ng b\u1edfi nhi\u1ec7t \u0111\u1ed9 cao, n\u1eafng g\u1eaft. + H\u00ecnh 4: B\u00f3n ph\u00e2n cho c\u00e2y \u0111\u1ec3 cung c\u1ea5p ch\u1ea5t kho\u00e1ng c\u1ea7n thi\u1ebft cho c\u00e2y tr\u1ed3ng sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n t\u1ed1t. \u2013 GV y\u00eau c\u1ea7u HS chia s\u1ebb v\u1edbi b\u1ea1n v\u1ec1 m\u1ed9t s\u1ed1 ho\u1ea1t \u0111\u1ed9ng ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng kh\u00e1c m\u00e0 em bi\u1ebft. G\u1ee3i \u00fd: Vun x\u1edbi g\u1ed1c cho c\u00e2y; l\u00e0m gi\u00e0n cho c\u00e2y th\u00e2n b\u00f2, th\u00e2n leo; bao b\u1ecdc tr\u00e1i non \u0111\u1ec3 tr\u00e1nh b\u1ecb c\u00f4n tr\u00f9ng ch\u00edch, h\u00fat; ch\u1ed1ng \u0111\u1ee1 cho c\u00e2y con kh\u00f4ng b\u1ecb gi\u00f3 m\u1ea1nh qu\u1eadt \u0111\u1ed5; c\u1eafm c\u00e0nh \u0111\u1ec3 r\u00e0o xung quanh g\u1ed1c gi\u00fap b\u1ea3o v\u1ec7 c\u00e1c c\u00e2y con,... * K\u1ebft lu\u1eadn: Ch\u00fang ta c\u1ea7n ch\u0103m s\u00f3c v\u00e0 b\u1ea3o v\u1ec7 c\u00e2y tr\u1ed3ng th\u00f4ng qua c\u00e1c vi\u1ec7c l\u00e0m nh\u01b0: t\u01b0\u1edbi n\u01b0\u1edbc, ph\u1ee7 m\u00e0ng ni l\u00f4ng \u0111\u1ec3 ch\u1ed1ng r\u00e9t, che n\u1eafng b\u1eb1ng l\u01b0\u1edbi, vun x\u1edbi g\u1ed1c c\u00e2y, b\u00f3n ph\u00e2n,\u2026 Ho\u1ea1t \u0111\u1ed9ng 2: X\u1eed l\u00ed t\u00ecnh hu\u1ed1ng * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc v\u1ec1 m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng \u0111\u1ec3 x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c theo nh\u00f3m 4. HS quan s\u00e1t h\u00ecnh 5 (SGK, trang 69), \u0111\u1ecdc n\u1ed9i dung t\u00ecnh hu\u1ed1ng v\u00e0 th\u1ea3o lu\u1eadn \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: Em s\u1ebd khuy\u00ean b\u1ea1n Lan \u0111i\u1ec1u g\u00ec trong t\u00ecnh hu\u1ed1ng n\u00e0y? \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng. GV \u0111i\u1ec1u khi\u1ec3n th\u1ea3o lu\u1eadn, gi\u00fap HS t\u1ef1 nh\u1eadn x\u00e9t l\u1eabn nhau \u0111\u1ec3 kh\u1eafc s\u00e2u ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc c\u00f3 li\u00ean quan v\u1ec1 vi\u1ec7c ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean nh\u1eefng nhu c\u1ea7u s\u1ed1ng c\u1ee7a th\u1ef1c v\u1eadt. G\u1ee3i \u00fd: B\u1ea1n Lan kh\u00f4ng n\u00ean c\u1ea5t ch\u1eadu hoa h\u1ed3ng v\u00e0o ph\u00f2ng tr\u01b0\u1edbc khi c\u1ea3 nh\u00e0 \u0111i du l\u1ecbch d\u00e0i ng\u00e0y v\u00ec khi ph\u00f2ng \u0111\u00f3ng c\u1eeda, t\u1eaft \u0111i\u1ec7n s\u1ebd thi\u1ebfu s\u00e1ng cho c\u00e2y hoa h\u1ed3ng quang h\u1ee3p; kh\u00f4ng kh\u00ed b\u1ecb b\u00ed, kh\u00f4ng l\u01b0u th\u00f4ng do \u0111\u00f3ng c\u1eeda s\u1ebd kh\u00f4ng t\u1ed1t cho c\u00e2y h\u00f4 h\u1ea5p v\u00e0 quang h\u1ee3p. Ho\u1ea1t \u0111\u1ed9ng 3: Em ch\u0103m s\u00f3c v\u01b0\u1eddn tr\u01b0\u1eddng * M\u1ee5c ti\u00eau: HS v\u1eadn d\u1ee5ng ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc v\u1ec1 m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng \u0111\u1ec3 l\u1eadp k\u1ebf ho\u1ea1ch v\u00e0 th\u1ef1c hi\u1ec7n ch\u0103m s\u00f3c v\u01b0\u1eddn tr\u01b0\u1eddng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS l\u00e0m vi\u1ec7c nh\u00f3m 6. HS c\u00f9ng th\u1ea3o lu\u1eadn \u0111\u1ec3 l\u1eadp k\u1ebf ho\u1ea1ch ch\u0103m s\u00f3c v\u01b0\u1eddn tr\u01b0\u1eddng trong 1 tu\u1ea7n (t\u1eeb th\u1ee9 2 \u0111\u1ebfn th\u1ee9 6) theo m\u1eabu g\u1ee3i \u00fd trong b\u1ea3ng k\u1ebf ho\u1ea1ch \u1edf trang 69 SGK. \u2013 HS th\u1ea3o lu\u1eadn, l\u00ean k\u1ebf ho\u1ea1ch. \u2013 GV quan s\u00e1t, theo d\u00f5i v\u00e0 h\u1ed7 tr\u1ee3 b\u1eb1ng c\u00e1ch g\u1ee3i \u00fd khi c\u1ea7n thi\u1ebft. \u2013 GV t\u1ed5 ch\u1ee9c cho 2 \u2013 3 nh\u00f3m chia s\u1ebb k\u1ebf ho\u1ea1ch c\u1ee7a nh\u00f3m m\u00ecnh v\u1edbi c\u1ea3 l\u1edbp. GV c\u00f3 th\u1ec3 \u0111\u1eb7t c\u00e1c c\u00e2u h\u1ecfi y\u00eau c\u1ea7u HS gi\u1ea3i th\u00edch v\u00ec sao c\u00f3 k\u1ebf ho\u1ea1ch nh\u01b0 v\u1eady, ph\u00e2n t\u00edch cho HS th\u1ea5y: c\u1ea7n c\u00f3 s\u1ef1 ph\u00e2n c\u00f4ng r\u00f5 r\u00e0ng v\u1ec1 t\u1eebng c\u00f4ng vi\u1ec7c; c\u00f3 th\u1eddi gian c\u1ee5 th\u1ec3; c\u00f3 ghi ch\u00fa k\u1ebft qu\u1ea3 \u0111\u1ec3 c\u00f3 th\u1ec3 110","theo d\u00f5i, gi\u00e1m s\u00e1t; c\u00f3 b\u00e1o c\u00e1o th\u00f4ng tin, b\u00e0n giao gi\u1eefa c\u00e1c th\u00e0nh vi\u00ean trong nh\u00f3m \u0111\u1ec3 c\u00f9ng theo d\u00f5i c\u00f4ng vi\u1ec7c \u0111\u00e3 l\u1eadp ra trong k\u1ebf ho\u1ea1ch. \u0110\u00e2y l\u00e0 m\u1ed9t ho\u1ea1t \u0111\u1ed9ng c\u00f3 th\u1ec3 l\u1ed3ng gh\u00e9p v\u1edbi vi\u1ec7c r\u00e8n luy\u1ec7n k\u0129 n\u0103ng l\u00e0m vi\u1ec7c nh\u00f3m cho HS; gi\u00e1o d\u1ee5c HS bi\u1ebft l\u1eadp k\u1ebf ho\u1ea1ch v\u00e0 th\u1ef1c hi\u1ec7n k\u1ebf ho\u1ea1ch hi\u1ec7u qu\u1ea3. V\u00ec v\u1eady, ngo\u00e0i vi\u1ec7c \u0111\u1ea3m b\u1ea3o cho HS v\u1eadn d\u1ee5ng t\u1ed1t ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc, GV c\u1ea7n khai th\u00e1c s\u00e2u h\u01a1n \u0111\u1ec3 gi\u00fap HS r\u00e8n luy\u1ec7n k\u0129 n\u0103ng l\u00e0m vi\u1ec7c. L\u01b0u \u00fd: N\u1ebfu ti\u1ebft h\u1ecdc thi\u1ebfu th\u1eddi gian, GV c\u00f3 th\u1ec3 chuy\u1ec3n ho\u1ea1t \u0111\u1ed9ng chia s\u1ebb k\u1ebf ho\u1ea1ch l\u1eadp \u0111\u01b0\u1ee3c c\u1ee7a c\u00e1c nh\u00f3m v\u00e0 th\u1ea3o lu\u1eadn, gi\u1ea3i th\u00edch sang ti\u1ebft 2. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 s\u01b0u t\u1ea7m tranh, \u1ea3nh ho\u1eb7c v\u1ebd v\u1ec1 nh\u1eefng vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i m\u00e0 HS bi\u1ebft \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft h\u1ecdc sau. Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 nh\u1eefng vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i m\u00e0 HS bi\u1ebft. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: \u1ede nh\u00e0 em c\u00f3 nu\u00f4i con v\u1eadt n\u00e0o kh\u00f4ng? K\u1ec3 m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m m\u00e0 em \u0111\u00e3 th\u1ef1c hi\u1ec7n \u0111\u1ec3 ch\u0103m s\u00f3c con v\u1eadt. \u2013 GV m\u1eddi 2 \u2013 3 HS b\u1ea5t k\u00ec tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. \u2013 D\u1ef1a v\u00e0o th\u1ef1c t\u1ebf c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS, GV ghi ch\u00fa m\u1ed9t s\u1ed1 n\u1ed9i dung li\u00ean quan l\u00ean b\u1ea3ng. GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft HS v\u00e0o ti\u1ebft 2 c\u1ee7a b\u00e0i h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u c\u00e1c vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i * M\u1ee5c ti\u00eau: HS nh\u1ea1\u0302n bi\u00ea\u0301t \u0111u\u031b\u01a1\u0323c m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c theo nh\u00f3m \u0111\u00f4i. HS quan s\u00e1t c\u00e1c h\u00ecnh 6, 7, 8, 9 (SGK, trang 70), th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: + Con ng\u01b0\u1eddi l\u00e0m nh\u1eefng vi\u1ec7c g\u00ec \u0111\u1ec3 ch\u0103m s\u00f3c v\u1eadt nu\u00f4i? + T\u00e1c d\u1ee5ng c\u1ee7a nh\u1eefng vi\u1ec7c l\u00e0m \u0111\u00f3 l\u00e0 g\u00ec? \u2013 GV m\u1eddi 1 \u2013 2 HS \u0111\u1ea1i di\u1ec7n tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi v\u00e0 gi\u1ea3i th\u00edch. Tu\u1ef3 theo t\u00ednh ch\u00ednh x\u00e1c c\u1ee7a c\u00e2u tr\u1ea3 l\u1eddi, GV c\u00f3 th\u1ec3 m\u1eddi th\u00eam HS kh\u00e1c b\u1ed5 sung ho\u1eb7c nh\u1eadn x\u00e9t \u0111\u1ec3 c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi ch\u00ednh x\u00e1c cho c\u1ea3 l\u1edbp. G\u1ee3i \u00fd: + H\u00ecnh 6: Cung c\u1ea5p th\u1ee9c \u0103n \u0111\u1ea7y \u0111\u1ee7 cho b\u00f2. T\u00e1c d\u1ee5ng: Gi\u00fap b\u00f2 c\u00f3 \u0111\u1ea7y \u0111\u1ee7 th\u1ee9c \u0103n, kh\u00f4ng b\u1ecb \u0111\u00f3i, s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n t\u1ed1t. + H\u00ecnh 7: V\u1ec7 sinh chu\u1ed3ng tr\u1ea1i v\u00e0 t\u1eafm cho l\u1ee3n. T\u00e1c d\u1ee5ng: L\u00e0m cho l\u1ee3n nu\u00f4i s\u1ea1ch s\u1ebd, m\u00f4i tr\u01b0\u1eddng chu\u1ed3ng tr\u1ea1i \u0111\u1ea3m b\u1ea3o v\u1ec7 sinh, kh\u00f4ng b\u1ecb \u00f4 nhi\u1ec5m do ch\u1ea5t th\u1ea3i c\u1ee7a l\u1ee3n. 111","+ H\u00ecnh 8: Che ch\u1eafn chu\u1ed3ng tr\u1ea1i cho tr\u00e2u, b\u00f2 v\u00e0o m\u00f9a l\u1ea1nh, th\u1eddi ti\u1ebft r\u00e9t, nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. T\u00e1c d\u1ee5ng: Gi\u00fap gi\u1eef \u1ea5m cho v\u1eadt nu\u00f4i, tr\u00e1nh gi\u00f3 l\u00f9a. + H\u00ecnh 9: Cho con ch\u00f3 u\u1ed1ng n\u01b0\u1edbc. T\u00e1c d\u1ee5ng: Cung c\u1ea5p \u0111\u1ee7 n\u01b0\u1edbc cho con ch\u00f3 \u0111\u1ec3 kh\u00f4ng b\u1ecb thi\u1ebfu n\u01b0\u1edbc gi\u00fap ch\u00f3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. \u2013 GV y\u00eau c\u1ea7u HS: K\u1ec3 m\u1ed9t s\u1ed1 vi\u1ec7c ch\u0103m s\u00f3c v\u1eadt nu\u00f4i \u1edf gia \u0111\u00ecnh v\u00e0 c\u1ed9ng \u0111\u1ed3ng m\u00e0 em bi\u1ebft. \u2013 HS th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u00f4i v\u00e0 n\u00eau th\u00eam m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i \u1edf gia \u0111\u00ecnh v\u00e0 c\u1ed9ng \u0111\u1ed3ng m\u00e0 em bi\u1ebft. GV h\u1ecfi th\u00eam v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a c\u00e1c vi\u1ec7c l\u00e0m m\u00e0 HS n\u00eau ra (l\u01b0u \u00fd: g\u1eafn v\u1edbi c\u00e1c ki\u1ebfn th\u1ee9c m\u00e0 HS \u0111\u00e3 \u0111\u01b0\u1ee3c h\u1ecdc v\u1ec1 nhu c\u1ea7u s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt). G\u1ee3i \u00fd: M\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i c\u00f3 th\u1ec3 k\u1ec3 th\u00eam nh\u01b0: Cho th\u00eam r\u01a1m v\u00e0o chu\u1ed3ng tr\u00e2u, b\u00f2 v\u00e0o m\u00f9a l\u1ea1nh; ph\u1ee7 ch\u0103n cho tr\u00e2u, b\u00f2 khi th\u1eddi ti\u1ebft gi\u00e1 r\u00e9t; t\u1eafm b\u1eb1ng d\u1ea7u g\u1ed9i ch\u1ed1ng ve, b\u00e9t cho ch\u00f3, m\u00e8o; kh\u00f4ng cung c\u1ea5p th\u1ee9c \u0103n \u00f4i thiu cho v\u1eadt nu\u00f4i; th\u1eafp \u0111\u00e8n \u0111i\u1ec7n s\u01b0\u1edfi \u1ea5m cho v\u1eadt nu\u00f4i v\u00e0o nh\u1eefng ng\u00e0y th\u1eddi ti\u1ebft gi\u00e1 r\u00e9t; tr\u1ed3ng c\u00e2y xanh quanh c\u00e1c chu\u1ed3ng nu\u00f4i; bu\u1ed9c tr\u00e2u, b\u00f2 v\u00e0o d\u01b0\u1edbi c\u00e1c c\u00e2y c\u00f3 t\u00e1n r\u1ed9ng, n\u01a1i m\u00e1t m\u1ebb,\u2026 * K\u1ebft lu\u1eadn: Ch\u00fang ta c\u1ea7n ch\u0103m s\u00f3c, b\u1ea3o v\u1ec7 v\u1eadt nu\u00f4i th\u00f4ng qua c\u00e1c vi\u1ec7c l\u00e0m nh\u01b0: cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 th\u1ee9c \u0103n, n\u01b0\u1edbc u\u1ed1ng, kh\u00ed \u00f4-xi, nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u00e1nh s\u00e1ng th\u00edch h\u1ee3p; th\u01b0\u1eddng xuy\u00ean v\u1ec7 sinh chu\u1ed3ng tr\u1ea1i,... \u0111\u1ec3 ch\u00fang s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n t\u1ed1t. Ho\u1ea1t \u0111\u1ed9ng 2: X\u1eed l\u00ed t\u00ecnh hu\u1ed1ng * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc v\u1ec1 m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m ch\u0103m s\u00f3c v\u1eadt nu\u00f4i \u0111\u1ec3 x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c theo nh\u00f3m 4. HS quan s\u00e1t h\u00ecnh 10 v\u00e0 11 (SGK, trang 70) v\u00e0 th\u1ea3o lu\u1eadn \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: Em s\u1ebd \u1ee9ng x\u1eed nh\u01b0 th\u1ebf n\u00e0o v\u1edbi m\u1ed7i t\u00ecnh hu\u1ed1ng n\u00e0y? \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng. GV \u0111i\u1ec1u khi\u1ec3n th\u1ea3o lu\u1eadn, gi\u00fap HS t\u1ef1 nh\u1eadn x\u00e9t l\u1eabn nhau \u0111\u1ec3 kh\u1eafc s\u00e2u ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc c\u00f3 li\u00ean quan v\u1ec1 vi\u1ec7c ch\u0103m s\u00f3c v\u1eadt nu\u00f4i d\u1ef1a tr\u00ean nh\u1eefng nhu c\u1ea7u s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt. G\u1ee3i \u00fd: + H\u00ecnh 10: Ao c\u00e1 c\u00f3 nhi\u1ec1u r\u00e1c v\u00e0 t\u00fai ni l\u00f4ng g\u00e2y \u00f4 nhi\u1ec5m cho c\u00e1c sinh v\u1eadt s\u1ed1ng trong ao. C\u1ea7n ph\u1ea3i v\u1edbt r\u00e1c, l\u00e0m s\u1ea1ch ao; \u0111\u1eb7t b\u1ea3ng c\u1ea5m v\u1ee9t r\u00e1c xu\u1ed1ng ao. + H\u00ecnh 11: \u0110\u1eb7t con ch\u00f3 con v\u00e0o h\u1ed9p k\u00edn thi\u1ebfu kh\u00f4ng kh\u00ed s\u1ebd l\u00e0m ch\u00f3 ng\u1ea1t th\u1edf. C\u1ea7n \u0111\u1ee5c l\u1ed7 cho kh\u00f4ng kh\u00ed c\u00f3 th\u1ec3 v\u00e0o b\u00ean trong h\u1ed9p \u0111\u1ec3 ch\u00f3 con th\u1edf khi c\u1ea7n \u0111\u01b0a \u0111i xa. \u2013 Tu\u1ef3 theo th\u1eddi gian, GV c\u00f3 th\u1ec3 chu\u1ea9n b\u1ecb th\u00eam m\u1ed9t s\u1ed1 t\u00ecnh hu\u1ed1ng ho\u1eb7c s\u1eed d\u1ee5ng n\u1ed9i dung \u1edf v\u1edf b\u00e0i t\u1eadp \u0111\u1ec3 HS c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c x\u1eed l\u00ed m\u1ed9t s\u1ed1 t\u00ecnh hu\u1ed1ng kh\u00e1c, kh\u1eafc s\u00e2u th\u00eam ki\u1ebfn th\u1ee9c. \u2013 GV d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c t\u1eeb kho\u00e1 c\u1ee7a b\u00e0i: Ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng \u2013 Ch\u0103m s\u00f3c v\u1eadt nu\u00f4i. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 v\u1eadn d\u1ee5ng c\u00e1c ki\u1ebfn th\u1ee9c \u0111\u00e3 \u0111\u01b0\u1ee3c h\u1ecdc trong b\u00e0i 17 \u0111\u1ec3 theo d\u00f5i v\u00e0 ch\u0103m s\u00f3c c\u00e1c v\u1eadt nu\u00f4i, c\u00e2y tr\u1ed3ng \u1edf nh\u00e0; chia s\u1ebb v\u1edbi ng\u01b0\u1eddi th\u00e2n v\u1ec1 c\u00e1c vi\u1ec7c l\u00e0m c\u1ea7n thi\u1ebft \u0111\u1ec3 ch\u0103m s\u00f3c c\u00e2y tr\u1ed3ng v\u00e0 v\u1eadt nu\u00f4i. 112","B\u00e0i 18. \u00d4N T\u1eacP CH\u1ee6 \u0110\u1ec0 TH\u1ef0C v\u1eadt v\u00e0 \u0110\u1ed8NG V\u1eacT (1 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u00d4n t\u1eadp c\u1ee7ng c\u1ed1 l\u1ea1i to\u00e0n b\u1ed9 c\u00e1c ki\u1ebfn th\u1ee9c \u0111\u00e3 \u0111\u01b0\u1ee3c h\u1ecdc trong ch\u1ee7 \u0111\u1ec1 Th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c v\u1eadt li\u1ec7u nh\u01b0 h\u01b0\u1edbng d\u1eabn \u1edf ho\u1ea1t \u0111\u1ed9ng 2 trang 71 SGK. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i \u0111\u1ec3 HS nh\u1edb l\u1ea1i nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc c\u1ee7a ch\u1ee7 \u0111\u1ec1 Th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS thi \u0111ua k\u1ec3 nh\u1eefng \u0111i\u1ec1u ki\u1ec7n c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt c\u00f3 th\u1ec3 s\u1ed1ng v\u00e0 ph\u00e1t tri\u1ec3n. \u2013 HS thi \u0111ua tr\u1ea3 l\u1eddi. \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201c\u00d4n t\u1eadp ch\u1ee7 \u0111\u1ec1 Th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: L\u00e0m \u00e1p ph\u00edch * M\u1ee5c ti\u00eau: HS s\u01b0u t\u1ea7m tranh \u1ea3nh, vi\u1ebft, v\u1ebd \u0111\u01b0\u1ee3c m\u1ed9t trong nh\u1eefng n\u1ed9i dung \u0111\u00e3 h\u1ecdc sau ch\u1ee7 \u0111\u1ec1 Th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t \u00e1p ph\u00edch. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS ho\u1ea1t \u0111\u1ed9ng theo nh\u00f3m 6. HS chu\u1ea9n b\u1ecb tr\u01b0\u1edbc \u1edf nh\u00e0 c\u00e1c h\u00ecnh \u1ea3nh s\u01b0u t\u1ea7m c\u00f3 li\u00ean quan \u0111\u1ebfn ch\u1ee7 \u0111\u1ec1. HS m\u1ed7i nh\u00f3m ti\u1ebfn h\u00e0nh d\u00e1n, v\u1ebd, vi\u1ebft v\u1ec1 m\u1ed9t m\u1ed9t trong c\u00e1c n\u1ed9i dung ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c c\u1ee7a ch\u1ee7 \u0111\u1ec1 \u0111\u1ec3 l\u00e0m m\u1ed9t \u00e1p ph\u00edch. G\u1ee3i \u00fd: Tu\u1ef3 theo tr\u00ecnh \u0111\u1ed9 c\u1ee7a HS, GV c\u00f3 th\u1ec3 g\u1ee3i \u00fd cho HS l\u00e0m m\u1ed9t s\u1ed1 ho\u1ea1t \u0111\u1ed9ng sau: vi\u1ebft l\u1ea1i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n n\u1ed9i dung c\u00e1c m\u1ee5c Em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c \u1edf c\u00e1c b\u00e0i 15, 16 v\u00e0 17 k\u00e8m theo m\u1ed9t s\u1ed1 tranh \u1ea3nh ho\u1eb7c h\u00ecnh v\u1ebd c\u00f3 li\u00ean quan;\u00a0vi\u1ebft t\u1ed5ng quan v\u1ec1 nh\u1eefng \u0111i\u1ec1u \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c trong ch\u1ee7 \u0111\u1ec1; v\u1ebd s\u01a1 \u0111\u1ed3 c\u00e1c kh\u00e1i ni\u1ec7m m\u1edbi \u0111\u00e3 h\u1ecdc trong ch\u1ee7 \u0111\u1ec1; vi\u1ebft nh\u1eefng c\u1ea3m nh\u1eadn c\u1ee7a HS v\u1ec1 nh\u1eefng \u0111i\u1ec1u \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c trong ch\u1ee7 \u0111\u1ec1 k\u00e8m h\u00ecnh \u1ea3nh minh ho\u1ea1 c\u00f3 li\u00ean quan,\u2026 \u2013 GV t\u1ed5 ch\u1ee9c cho \u0111\u1ea1i di\u1ec7n m\u1ed9t s\u1ed1 nh\u00f3m l\u00ean chia s\u1ebb s\u1ea3n ph\u1ea9m c\u1ee7a nh\u00f3m m\u00ecnh. L\u01b0u \u00fd: GV ch\u1ecdn c\u00e1c s\u1ea3n ph\u1ea9m \u0111a d\u1ea1ng v\u1ec1 h\u00ecnh th\u1ee9c, ch\u1ecdn c\u00e1c s\u1ea3n ph\u1ea9m kh\u00f4ng t\u1ed1t ho\u1eb7c ch\u01b0a ho\u00e0n thi\u1ec7n \u0111\u1ec3 tr\u00ecnh b\u00e0y tr\u01b0\u1edbc. GV m\u1eddi 1 \u2013 2 HS kh\u00e1c nh\u1eadn x\u00e9t, g\u00f3p \u00fd cho b\u1ea1n \u0111\u1ec3 ho\u00e0n thi\u1ec7n s\u1ea3n ph\u1ea9m h\u01a1n. 113","\u2013 GV \u0111i\u1ec1u khi\u1ec3n th\u1ea3o lu\u1eadn, nh\u1eadn x\u00e9t l\u1eabn nhau c\u1ee7a HS, gi\u00fap HS nh\u1eadn ra nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u00f2n thi\u1ebfu s\u00f3t \u0111\u1ec3 ho\u00e0n thi\u1ec7n c\u00e1c s\u1ea3n ph\u1ea9m c\u1ee7a m\u00ecnh. GV n\u00ean c\u00f3 h\u00ecnh th\u1ee9c khen th\u01b0\u1edfng, cho \u0111i\u1ec3m ho\u1eb7c c\u00e1c h\u00ecnh th\u1ee9c \u0111\u1ed9ng vi\u00ean kh\u00e1c h\u1ee3p l\u00ed cho nh\u1eefng s\u1ea3n ph\u1ea9m t\u1ed1t, s\u00e1ng t\u1ea1o. Ho\u1ea1t \u0111\u1ed9ng 2: C\u00f9ng s\u00e1ng t\u1ea1o * M\u1ee5c ti\u00eau: HS thi\u1ebft k\u1ebf \u0111\u01b0\u1ee3c m\u1ed9t b\u00ecnh t\u01b0\u1edbi n\u01b0\u1edbc nh\u1ecf gi\u1ecdt cho c\u00e2y tr\u1ed3ng gi\u00fap ti\u1ebft ki\u1ec7m n\u01b0\u1edbc. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV \u0111\u1eb7t v\u1ea5n \u0111\u1ec1: Ch\u00fang ta c\u1ea7n ti\u1ebft ki\u1ec7m n\u01b0\u1edbc v\u00ec kh\u00f4ng c\u1ea7n t\u01b0\u1edbi qu\u00e1 nhi\u1ec1u n\u01b0\u1edbc cho c\u00e2y m\u1ed9t l\u00fac \u0111\u1ec3 tr\u00e1nh l\u00e3ng ph\u00ed n\u01b0\u1edbc; ngo\u00e0i ra, khi ch\u00fang ta v\u1eafng nh\u00e0 ng\u1eafn ng\u00e0y, kh\u00f4ng th\u1ec3 t\u01b0\u1edbi n\u01b0\u1edbc h\u1eb1ng ng\u00e0y cho c\u00e2y v\u00ec v\u1eady m\u1ed9t b\u00ecnh t\u01b0\u1edbi nh\u1ecf gi\u1ecdt l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft. \u2013 GV t\u1ed5 ch\u1ee9c cho HS l\u00e0m vi\u1ec7c theo nh\u00f3m 4. HS th\u1ea3o lu\u1eadn nh\u00f3m v\u00e0 th\u1ef1c hi\u1ec7n thi\u1ebft k\u1ebf b\u00ecnh t\u01b0\u1edbi nh\u1ecf gi\u1ecdt nh\u01b0 c\u00e1c b\u01b0\u1edbc g\u1ee3i \u00fd \u1edf c\u00e1c h\u00ecnh 1, 2, 3 (SGK, trang 71). \u2013 GV l\u01b0u \u00fd HS c\u1ea7n c\u1ea9n th\u1eadn khi d\u00f9ng \u0111\u1ed3 v\u1eadt s\u1eafc nh\u1ecdn, kh\u00f4ng \u0111\u00f9a ngh\u1ecbch trong qu\u00e1 tr\u00ecnh th\u1ef1c h\u00e0nh; ti\u1ebfn h\u00e0nh l\u00e0m b\u00ecnh t\u01b0\u1edbi nh\u1ecf gi\u1ecdt theo tr\u00ecnh t\u1ef1 t\u1eebng b\u01b0\u1edbc. \u2013 GV theo d\u00f5i, gi\u00e1m s\u00e1t c\u00e1c nh\u00f3m, h\u1ed7 tr\u1ee3 cho HS khi c\u1ea7n thi\u1ebft, kh\u00f4ng \u0111\u01b0\u1ee3c l\u00e0m thay cho HS. \u2013 \u0110\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c s\u00f4i n\u1ed5i v\u00e0 HS c\u00f3 nhi\u1ec1u l\u1ef1a ch\u1ecdn cho v\u1eadt li\u1ec7u d\u1eabn n\u01b0\u1edbc nh\u1ecf gi\u1ecdt t\u1eeb trong b\u00ecnh ra \u0111\u1ea5t, GV c\u00f3 th\u1ec3 b\u1ed5 sung th\u00eam d\u00e2y ni l\u00f4ng, d\u00e2y v\u1ea3i c\u00f3 h\u00e0m l\u01b0\u1ee3ng ni l\u00f4ng nhi\u1ec1u, d\u00e2y v\u1ea3i coton \u0111\u1ec3 HS l\u1ef1a ch\u1ecdn lo\u1ea1i v\u1eadt li\u1ec7u l\u00e0m d\u00e2y d\u1eabn n\u01b0\u1edbc; k\u00edch th\u01b0\u1edbc \u0111\u01b0\u1eddng k\u00ednh c\u00e1c s\u1ee3i d\u00e2y v\u1ea3i kh\u00e1c nhau. L\u01b0u \u00fd: Ph\u01b0\u01a1ng \u00e1n ch\u1ecdn d\u00e2y v\u1ea3i coton l\u00e0 ph\u01b0\u01a1ng \u00e1n t\u1ed1i \u01b0u nh\u1ea5t, d\u00e2y kh\u00f4ng qu\u00e1 to \u0111\u1ec3 n\u01b0\u1edbc ch\u1ea3y ra kh\u00f4ng qu\u00e1 nhi\u1ec1u. \u2013 GV m\u1eddi l\u1ea7n l\u01b0\u1ee3t c\u00e1c nh\u00f3m chia s\u1ebb v\u1edbi c\u1ea3 l\u1edbp s\u1ea3n ph\u1ea9m c\u1ee7a nh\u00f3m m\u00ecnh. GV c\u00f3 th\u1ec3 \u0111\u1eb7t m\u1ed9t ch\u1eadu c\u00e2y \u0111\u1ec3 l\u00e0m v\u00ed d\u1ee5 cho vi\u1ec7c tr\u00ecnh b\u00e0y s\u1ea3n ph\u1ea9m c\u1ee7a c\u00e1c nh\u00f3m. GV \u01b0u ti\u00ean m\u1eddi c\u00e1c nh\u00f3m l\u00e0m s\u1ea3n ph\u1ea9m kh\u00f4ng t\u1ed1t tr\u00ecnh b\u00e0y tr\u01b0\u1edbc, c\u00e1c nh\u00f3m c\u00f3 s\u1ea3n ph\u1ea9m ho\u00e0n thi\u1ec7n h\u01a1n s\u1ebd tr\u00ecnh b\u00e0y sau. \u2013 G\u1ee3i \u00fd y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi s\u1ea3n ph\u1ea9m: + L\u1ed7 \u1edf n\u1eafp chai nh\u1ef1a kh\u00f4ng qu\u00e1 to, v\u1eeba ph\u1ea3i \u0111\u1ec3 \u0111\u1ee7 cho d\u00e2y v\u1ea3i lu\u1ed3n qua. + D\u00e2y d\u1eabn n\u01b0\u1edbc ph\u1ea3i l\u00e0 d\u00e2y v\u1ea3i coton (l\u00e0 ph\u01b0\u01a1ng \u00e1n t\u1ed1i \u01b0u) v\u00ec kh\u1ea3 n\u0103ng d\u1eabn n\u01b0\u1edbc t\u1ed1t. + N\u01b0\u1edbc ch\u1ea3y ra theo d\u1ea1ng nh\u1ecf gi\u1ecdt, c\u00e0ng ch\u1eadm c\u00e0ng t\u1ed1t, gi\u1ecdt n\u01b0\u1edbc v\u1eeba ph\u1ea3i. + Chai nh\u1ef1a \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh ch\u1eafc ch\u1eafn v\u00e0o c\u1ecdc. C\u1ecdc \u0111\u01b0\u1ee3c c\u1eafm \u0111\u00fang v\u1ecb tr\u00ed, kh\u00f4ng qu\u00e1 xa g\u1ed1c c\u00e2y \u0111\u1ec3 n\u01b0\u1edbc c\u00f3 th\u1ec3 th\u1ea5m v\u00e0o r\u1ec5 c\u00e2y d\u1ec5 d\u00e0ng. + Kho\u1ea3ng c\u00e1ch t\u1eeb n\u1eafp chai \u0111\u1ebfn m\u1eb7t \u0111\u1ea5t kh\u00f4ng qu\u00e1 xa, kho\u1ea3ng 10 \u2013 15 cm l\u00e0 v\u1eeba ph\u1ea3i. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 xem l\u1ea1i, \u0111\u1ecdc v\u00e0 ghi nh\u1edb c\u00e1c n\u1ed9i dung Em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c \u1edf c\u00e1c b\u00e0i 15, 16, 17 c\u1ee7a ch\u1ee7 \u0111\u1ec1 Th\u1ef1c v\u1eadt v\u00e0 \u0111\u1ed9ng v\u1eadt. 114","Chu\u00fb \u00f1e\u00e0 4: NA\u00c1M B\u00e0i 19. S\u1ef0 \u0110A D\u1ea0NG C\u1ee6A N\u1ea4M (1 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2013 Nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c s\u1ef1 \u0111a \u0111\u1ea1ng c\u1ee7a n\u1ea5m, c\u00f3 nhi\u1ec1u lo\u1ea1i n\u1ea5m kh\u00e1c nhau. \u2013 N\u00eau \u0111u\u031b\u01a1\u0323c hi\u0300nh da\u0323ng, ki\u0301ch thu\u031b\u01a1\u0301c, ma\u0300u s\u0103\u0301c va\u0300 no\u031bi s\u00f4\u0301ng kha\u0301c nhau c\u1ee7a m\u1ed9t s\u1ed1 lo\u1ea1i n\u1ea5m qua quan sa\u0301t tranh a\u0309nh ho\u1ea1\u0306c video. II. \u0110\u1ed2 D\u00d9NG D\u1ea0Y H\u1eccC \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 19 SGK, \u0111\u1ea5t n\u1eb7n nhi\u1ec1u m\u00e0u, gi\u1ea5y, phi\u1ebfu quan s\u00e1t, m\u1ed9t s\u1ed1 m\u1eabu n\u1ea5m th\u1eadt. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 n\u1ea5m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan s\u00e1t h\u00ecnh 1 (SGK, trang 73). \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi cho HS: Sinh v\u1eadt trong h\u00ecnh c\u00f3 ph\u1ea3i l\u00e0 c\u00e2y xanh kh\u00f4ng? V\u00ec sao? \u2013 GV m\u1eddi HS b\u1ea5t k\u00ec \u0111\u1ee9ng l\u00ean tr\u1ea3 l\u1eddi. \u2013 GV \u0111\u1ec3 HS tr\u1ea3 l\u1eddi t\u1ef1 do, kh\u00f4ng ch\u1ec9nh s\u1eeda ch\u00ednh x\u00e1c c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS. D\u1ef1a v\u00e0o th\u1ef1c t\u1ebf c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS, GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cS\u1ef1 \u0111a d\u1ea1ng c\u1ee7a n\u1ea5m\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: Kh\u00e1m ph\u00e1 h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc c\u1ee7a n\u1ea5m * M\u1ee5c ti\u00eau: HS nh\u1ea1\u0302n bi\u00ea\u0301t \u0111u\u031b\u01a1\u0323c h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c n\u1ea5m kh\u00e1c nhau. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh 2 \u2013 7 (SGK, trang 73) v\u1ec1 c\u00e1c lo\u1ea1i n\u1ea5m kh\u00e1c nhau. \u2013 GV gi\u1edbi thi\u1ec7u cho HS m\u1ed9t s\u1ed1 h\u00ecnh d\u1ea1ng c\u1ee7a n\u1ea5m nh\u01b0 h\u00ecnh ch\u00f3p n\u00f3n, h\u00ecnh m\u0169, h\u00ecnh c\u1ea7u, h\u00ecnh s\u1ee3i,\u2026 ho\u1eb7c GV c\u00f3 th\u1ec3 y\u00eau c\u1ea7u HS \u0111\u1ecdc th\u00f4ng tin trong m\u1ee5c Em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c (SGK, trang 74). Sau \u0111\u00f3, GV y\u00eau c\u1ea7u HS ho\u00e0n th\u00e0nh phi\u1ebfu quan s\u00e1t trong SGK. \u2013 GV l\u01b0u \u00fd cho HS h\u00ecnh 6, 7 l\u00e0 hai lo\u1ea1i n\u1ea5m c\u00f3 k\u00edch th\u01b0\u1edbc r\u1ea5t nh\u1ecf n\u00ean kh\u00f4ng th\u1ec3 quan s\u00e1t \u0111\u01b0\u1ee3c b\u1eb1ng m\u1eaft th\u01b0\u1eddng m\u00e0 ph\u1ea3i quan s\u00e1t b\u1eb1ng k\u00ednh hi\u1ec3n vi. 115","\u2013 GV c\u00f3 th\u1ec3 cho HS quan s\u00e1t m\u1ed9t s\u1ed1 h\u00ecnh \u1ea3nh v\u1ec1 c\u00e1c lo\u1ea1i n\u1ea5m ph\u1ed5 bi\u1ebfn \u1edf \u0111\u1ecba ph\u01b0\u01a1ng ho\u1eb7c GV cho HS quan s\u00e1t m\u1eabu n\u1ea5m th\u1eadt v\u00e0 gi\u1edbi thi\u1ec7u cho HS bi\u1ebft t\u00ean g\u1ecdi ch\u00ednh x\u00e1c c\u1ee7a ch\u00fang. \u2013 GV cho HS l\u00e0m vi\u1ec7c c\u00e1 nh\u00e2n; GV quan s\u00e1t, g\u1ee3i \u00fd cho HS v\u1ec1 h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c lo\u1ea1i n\u1ea5m \u0111\u1ec3 HS ho\u00e0n th\u00e0nh phi\u1ebfu quan s\u00e1t theo m\u1eabu trong SGK. G\u1ee3i \u00fd: PHI\u1ebeU QUAN S\u00c1T T\u00ean n\u1ea5m H\u00ecnh d\u1ea1ng M\u00e0u s\u1eafc K\u00edch th\u01b0\u1edbc Tr\u1eafng Nh\u1ecf N\u1ea5m m\u1ed1c H\u00ecnh s\u1ee3i Tr\u1eafng Nh\u1ecf N\u00e2u L\u1edbn N\u1ea5m men r\u01b0\u1ee3u H\u00ecnh b\u1ea7u d\u1ee5c L\u1edbn V\u00e0ng nh\u1ea1t, \u0111en nh\u1ea1t L\u1edbn N\u1ea5m m\u1ed9c nh\u0129 H\u00ecnh d\u1ea1ng gi\u1ed1ng c\u00e1i tai Tr\u1eafng, v\u00e0ng nh\u1ea1t L\u1edbn \u0110\u1ecf N\u1ea5m r\u01a1m G\u1ea7n gi\u1ed1ng h\u00ecnh tr\u1ee5, c\u00f3 m\u0169 n\u1ea5m N\u1ea5m kim ch\u00e2m H\u00ecnh que thon d\u00e0i, c\u00f3 m\u0169 n\u1ea5m N\u1ea5m linh chi \u0111\u1ecf M\u0169 n\u1ea5m h\u00ecnh c\u00e1nh qu\u1ea1t \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau d\u01b0\u1edbi s\u1ef1 \u0111i\u1ec1u khi\u1ec3n c\u1ee7a GV. \u2013 GV nh\u1eadn x\u00e9t, k\u1ebft lu\u1eadn v\u00e0 ch\u1ed1t l\u1ea1i \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c cho phi\u1ebfu quan s\u00e1t. \u2013 GV y\u00eau c\u1ea7u HS k\u1ec3 t\u00ean m\u1ed9t s\u1ed1 n\u1ea5m kh\u00e1c theo hi\u1ec3u bi\u1ebft c\u1ee7a HS, t\u1eeb \u0111\u00f3 m\u00f4 t\u1ea3 h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c n\u1ea5m \u0111\u00f3. * K\u1ebft lu\u1eadn: \u2013 C\u00f3 nhi\u1ec1u lo\u00e0i n\u1ea5m trong t\u1ef1 nhi\u00ean. C\u00e1c lo\u00e0i n\u1ea5m kh\u00e1c nhau v\u1ec1 h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc v\u00e0 m\u00e0u s\u1eafc. \u2013 N\u1ea5m c\u00f3 nhi\u1ec1u h\u00ecnh d\u1ea1ng kh\u00e1c nhau nh\u01b0 h\u00ecnh m\u0169, h\u00ecnh ch\u00f3p n\u00f3n, h\u00ecnh c\u1ea7u, h\u00ecnh s\u1ee3i,\u2026 \u2013 M\u00e0u s\u1eafc c\u1ee7a n\u1ea5m r\u1ea5t phong ph\u00fa nh\u01b0 m\u00e0u n\u00e2u, v\u00e0ng, tr\u1eafng, \u0111\u1ecf,\u2026 \u2013 M\u1ed9t s\u1ed1 n\u1ea5m l\u1edbn c\u00f3 th\u1ec3 quan s\u00e1t \u0111\u01b0\u1ee3c b\u1eb1ng m\u1eaft th\u01b0\u1eddng nh\u01b0ng c\u0169ng c\u00f3 nh\u1eefng n\u1ea5m c\u00f3 k\u00edch th\u01b0\u1edbc r\u1ea5t nh\u1ecf ch\u1ec9 quan s\u00e1t \u0111\u01b0\u1ee3c b\u1eb1ng k\u00ednh hi\u1ec3n vi nh\u01b0 n\u1ea5m m\u1ed1c v\u00e0 n\u1ea5m men. Ho\u1ea1t \u0111\u1ed9ng 2: T\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m * M\u1ee5c ti\u00eau: HS nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS ho\u1ea1t \u0111\u1ed9ng nh\u00f3m \u0111\u00f4i. \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh 8 (SGK, trang 74) \u0111\u1ec3 nh\u1eadn bi\u1ebft c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m qua h\u00ecnh v\u1ebd, t\u1eeb \u0111\u00f3 v\u1eadn d\u1ee5ng \u0111\u1ec3 ch\u1ec9 ra c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m th\u1eadt. 116","\u2013 GV m\u1eddi 1 \u2013 2 HS ch\u1ec9 tr\u00ean s\u01a1 \u0111\u1ed3 h\u00ecnh 8 \u0111\u1ec3 n\u00f3i v\u1edbi b\u1ea1n v\u1ec1 m\u1ed9t s\u1ed1 b\u1ed9 ph\u1eadn ch\u00ednh c\u1ee7a n\u1ea5m. Sau \u0111\u00f3 GV m\u1eddi 2 \u2013 3 HS kh\u00e1c ch\u1ec9 v\u00e0 n\u00f3i t\u00ean c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m th\u1eadt \u1edf h\u00ecnh 8. \u2013 HS ch\u1ec9 tr\u00ean h\u00ecnh v\u1ebd, n\u00f3i t\u00ean m\u1ed9t s\u1ed1 b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m, t\u1eeb \u0111\u00f3 ch\u1ec9 v\u00e0 n\u00f3i t\u00ean c\u00e1c b\u1ed9 ph\u1eadn t\u01b0\u01a1ng \u1ee9ng \u1edf h\u00ecnh n\u1ea5m th\u1eadt. \u2013 GV c\u00f3 th\u1ec3 chu\u1ea9n b\u1ecb th\u00eam h\u00ecnh \u1ea3nh m\u1ed9t s\u1ed1 n\u1ea5m kh\u00e1c ho\u1eb7c GV c\u00f3 th\u1ec3 chu\u1ea9n b\u1ecb m\u1eabu v\u1eadt th\u1eadt \u0111\u1ec3 m\u1edf r\u1ed9ng cho HS c\u00f9ng nh\u1eadn bi\u1ebft c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a nhi\u1ec1u n\u1ea5m kh\u00e1c nhau. GV gi\u1ea3i th\u00edch cho HS: M\u1ed9t s\u1ed1 n\u1ea5m \u0103n b\u00e1n \u1edf ch\u1ee3, si\u00eau th\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c l\u00e0m s\u1ea1ch, c\u1eaft b\u1ecf ch\u00e2n n\u1ea5m v\u00e0 c\u00e1c s\u1ee3i n\u1ea5m \u0111\u1ec3 HS kh\u00f4ng hi\u1ec3u sai v\u1ec1 c\u1ea5u t\u1ea1o c\u1ee7a n\u1ea5m. * K\u1ebft lu\u1eadn: C\u00e1c n\u1ea5m l\u1edbn th\u01b0\u1eddng c\u00f3 c\u1ea5u t\u1ea1o g\u1ed3m c\u00e1c b\u1ed9 ph\u1eadn ch\u00ednh: m\u0169 n\u1ea5m, th\u00e2n n\u1ea5m, ch\u00e2n n\u1ea5m. Ho\u1ea1t \u0111\u1ed9ng 3: C\u00f9ng s\u00e1ng t\u1ea1o * M\u1ee5c ti\u00eau: HS v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c v\u1ec1 c\u1ea5u t\u1ea1o c\u1ee7a n\u1ea5m \u0111\u1ec3 t\u1ea1o h\u00ecnh n\u1ea5m b\u1eb1ng \u0111\u1ea5t n\u1eb7n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4 v\u00e0 ph\u00e1t cho m\u1ed7i nh\u00f3m m\u1ed9t b\u1ed9 \u0111\u1ea5t n\u1eb7n nhi\u1ec1u m\u00e0u. \u2013 GV y\u00eau c\u1ea7u c\u00e1c nh\u00f3m d\u00f9ng \u0111\u1ea5t n\u1eb7n \u0111\u1ec3 t\u1ea1o h\u00ecnh c\u00e2y n\u1ea5m v\u1edbi \u0111\u1ea7y \u0111\u1ee7 c\u00e1c b\u1ed9 ph\u1eadn. \u2013 HS t\u1ea1o h\u00ecnh c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m t\u1eeb \u0111\u1ea5t n\u1eb7n. HS c\u00f3 th\u1ec3 t\u1ef1 do s\u00e1ng t\u1ea1o m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc, h\u00ecnh d\u1ea1ng c\u1ee7a c\u00e1c c\u00e2y n\u1ea5m. \u2013 GV t\u1ed5 ch\u1ee9c cho c\u00e1c nh\u00f3m tr\u00ecnh b\u00e0y s\u1ea3n ph\u1ea9m v\u1edbi c\u1ea3 l\u1edbp. GV quan s\u00e1t, h\u1ed7 tr\u1ee3 c\u00e1c nh\u00f3m khi t\u1ea1o h\u00ecnh. \u2013 C\u00e1c nh\u00f3m chia s\u1ebb s\u1ea3n ph\u1ea9m v\u00e0 nh\u1eadn x\u00e9t s\u1ea3n ph\u1ea9m c\u1ee7a nhau. GV d\u1eabn d\u1eaft HS r\u00fat ra k\u1ebft lu\u1eadn v\u1ec1 c\u1ea5u t\u1ea1o c\u1ee7a n\u1ea5m v\u00e0 h\u01b0\u1edbng d\u1eabn HS kh\u1eafc s\u00e2u ki\u1ebfn th\u1ee9c. \u2013 Trong tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng c\u00f3 \u0111\u1ea5t n\u1eb7n, GV c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c cho HS x\u00e9, d\u00e1n h\u00ecnh \u1ea3nh c\u00e2y n\u1ea5m ho\u1eb7c v\u1ebd l\u00ean gi\u1ea5y v\u00e0 ch\u00fa th\u00edch t\u00ean c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a n\u1ea5m m\u00e0 HS \u0111\u00e3 \u0111\u01b0\u1ee3c h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 4: T\u00ecm hi\u1ec3u n\u01a1i s\u1ed1ng c\u1ee7a n\u1ea5m * M\u1ee5c ti\u00eau: HS bi\u1ebft \u0111\u01b0\u1ee3c n\u01a1i s\u1ed1ng c\u1ee7a n\u1ea5m r\u1ea5t \u0111a d\u1ea1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chi\u1ebfu l\u00ean b\u1ea3ng cho HS quan s\u00e1t c\u00e1c h\u00ecnh 10 \u2013 13 (SGK, trang 75) ho\u1eb7c y\u00eau c\u1ea7u HS nh\u00ecn h\u00ecnh trong SGK. \u2013 GV \u0111\u1eb7t ra y\u00eau c\u1ea7u cho HS: Quan s\u00e1t c\u00e1c h\u00ecnh v\u00e0 cho bi\u1ebft n\u1ea5m th\u01b0\u1eddng s\u1ed1ng \u1edf \u0111\u00e2u. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS \u0111\u1ee9ng l\u00ean tr\u1ea3 l\u1eddi. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: C\u00e1c m\u00f4i tr\u01b0\u1eddng s\u1ed1ng c\u1ee7a n\u1ea5m th\u01b0\u1eddng c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m g\u00ec? G\u1ee3i \u00fd: + N\u1ea5m th\u01b0\u1eddng s\u1ed1ng \u1edf tr\u00ean th\u00e2n c\u00e2y \u0111\u00e3 ch\u1ebft (h\u00ecnh 10); tr\u00ean \u0111\u1ea5t (h\u00ecnh 11); tr\u00ean th\u1ef1c ph\u1ea9m (h\u00ecnh 12); tr\u00ean r\u01a1m, r\u1ea1 (h\u00ecnh 13). + N\u01a1i s\u1ed1ng c\u1ee7a n\u1ea5m th\u01b0\u1eddng \u1ea9m \u01b0\u1edbt v\u00e0 c\u00f3 nhi\u1ec1u ch\u1ea5t dinh d\u01b0\u1ee1ng. 117","\u2013 GV y\u00eau c\u1ea7u HS k\u1ec3 th\u00eam m\u1ed9t s\u1ed1 n\u01a1i s\u1ed1ng c\u1ee7a n\u1ea5m. (G\u1ee3i \u00fd: tr\u00ean th\u00e2n c\u00e2y, tr\u00ean x\u00e1c \u0111\u1ed9ng v\u1eadt, tr\u00ean da, tr\u00ean b\u1ec1 m\u1eb7t g\u1ed7, tr\u00ean t\u01b0\u1eddng \u1ea9m,\u2026). \u2013 GV c\u00f9ng HS nh\u1eadn x\u00e9t v\u00e0 r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: N\u1ea5m th\u01b0\u1eddng s\u1ed1ng \u1edf nh\u1eefng n\u01a1i \u1ea9m \u01b0\u1edbt, gi\u00e0u dinh d\u01b0\u1ee1ng nh\u01b0 \u0111\u1ea5t \u1ea9m, r\u01a1m r\u1ea1, x\u00e1c th\u1ef1c v\u1eadt,... Ho\u1ea1t \u0111\u1ed9ng 5: \u0110\u1ed1 em * M\u1ee5c ti\u00eau: HS hi\u1ec3u v\u00e0 v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc v\u1ec1 n\u1ea5m v\u00e0o \u0111\u1eddi s\u1ed1ng th\u1ef1c ti\u1ec5n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV n\u00eau c\u00e2u \u0111\u1ed1 cho HS: V\u00ec sao sau m\u01b0a m\u1ed9t th\u1eddi gian, trong v\u01b0\u1eddn th\u01b0\u1eddng m\u1ecdc l\u00ean nhi\u1ec1u n\u1ea5m? \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. \u2013 HS suy ngh\u0129 v\u00e0 tr\u1ea3 l\u1eddi. \u2013 GV nh\u1eadn x\u00e9t v\u00e0 nh\u1ea5n m\u1ea1nh v\u1edbi to\u00e0n l\u1edbp v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m m\u00f4i tr\u01b0\u1eddng s\u1ed1ng c\u1ee7a n\u1ea5m l\u00e0 \u1ea9m \u01b0\u1edbt v\u00e0 nhi\u1ec1u dinh d\u01b0\u1ee1ng. G\u1ee3i \u00fd: V\u00ec \u0111\u1eb7c \u0111i\u1ec3m n\u01a1i s\u1ed1ng c\u1ee7a n\u1ea5m l\u00e0 \u1ea9m \u01b0\u1edbt v\u00e0 nhi\u1ec1u dinh d\u01b0\u1ee1ng n\u00ean sau m\u1ed9t th\u1eddi gian m\u01b0a, kh\u00f4ng kh\u00ed \u1ea9m \u0111\u00e3 l\u00e0m cho n\u1ea5m m\u1ecdc l\u00ean trong v\u01b0\u1eddn. \u2013 GV g\u1ee3i \u00fd v\u00e0 d\u1eabn d\u1eaft HS n\u00eau \u0111\u01b0\u1ee3c c\u00e1c t\u1eeb kho\u00e1 trong b\u00e0i: N\u1ea5m \u2013 M\u0169 n\u1ea5m \u2013 Th\u00e2n n\u1ea5m \u2013 Ch\u00e2n n\u1ea5m. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc \u2013 GV y\u00eau c\u1ea7u HS \u0111\u1ecdc v\u00e0 ghi nh\u1edb th\u00f4ng tin ki\u1ebfn th\u1ee9c \u1edf c\u00e1c m\u1ee5c Em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c trong b\u00e0i 19. \u2013 GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 s\u01b0u t\u1ea7m th\u00eam tranh \u1ea3nh v\u1ec1 n\u1ea5m v\u00e0 nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c c\u00e1c b\u1ed9 ph\u1eadn chung c\u1ee7a n\u1ea5m. B\u00e0i 20. N\u1ea4M \u0102N V\u00c0 N\u1ea4M MEN TRONG \u0110\u1edcI S\u1ed0NG (2 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2212 N\u00eau \u0111\u01b0\u1ee3c t\u00ean v\u00e0 m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m (h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc) c\u1ee7a n\u1ea5m \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m th\u1ee9c \u0103n qua quan s\u00e1t tranh \u1ea3nh ho\u1eb7c video. \u2212 Kh\u00e1m ph\u00e1 \u0111\u01b0\u1ee3c \u00edch l\u1ee3i c\u1ee7a m\u1ed9t s\u1ed1 n\u1ea5m men trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m th\u00f4ng qua th\u00ed nghi\u1ec7m th\u1ef1c h\u00e0nh ho\u1eb7c quan s\u00e1t tranh \u1ea3nh, video. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 20 SGK, m\u1ed9t s\u1ed1 h\u00ecnh \u1ea3nh th\u1ee9c \u0103n \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb n\u1ea5m men, phi\u1ebfu h\u1ecdc t\u1eadp, nguy\u00ean li\u1ec7u, d\u1ee5ng c\u1ee5 l\u00e0m th\u00ed nghi\u1ec7m (b\u1ed9t m\u00ec, n\u01b0\u1edbc, n\u1ea5m men, b\u00e1t to, \u0111\u0129a). \u2013 HS: SGK, VBT. 118","III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa, kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 m\u00f4\u0323t s\u00f4\u0301 m\u00f3n \u0103n \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb n\u1ea5m v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan sa\u0301t hi\u0300nh 1 (SGK, trang 76). \u2013 GV t\u1ed5 ch\u1ee9c cho HS l\u00e0m vi\u1ec7c nh\u00f3m \u0111\u00f4i, m\u1ed9t b\u1ea1n \u0111\u1eb7t c\u00e2u h\u1ecfi, m\u1ed9t b\u1ea1n tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: V\u00ed d\u1ee5: + B\u1ea1n \u0111\u1eb7t c\u00e2u h\u1ecfi: B\u1ea1n \u0111\u00e3 t\u1eebng \u0103n nh\u1eefng m\u00f3n \u0103n n\u00e0o \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb n\u1ea5m? + B\u1ea1n tr\u1ea3 l\u1eddi: M\u00ecnh \u0111\u00e3 \u0103n m\u00f3n n\u1ea5m x\u00e0o\/l\u1ea9u n\u1ea5m,\u2026 \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cN\u1ea5m \u0103n v\u00e0 n\u1ea5m men trong \u0111\u1eddi s\u1ed1ng\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a n\u1ea5m \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m th\u1ee9c \u0103n * M\u1ee5c ti\u00eau: HS nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a n\u1ea5m \u0103n v\u00e0 k\u1ec3 t\u00ean \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 n\u1ea5m \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u00f4i, quan sa\u0301t c\u00e1c hi\u0300nh 2, 3, 4, 5, 6, 7 (SGK, trang 76) va\u0300 ho\u00e0n th\u00e0nh nhi\u1ec7m v\u1ee5: + K\u1ec3 t\u00ean m\u1ed9t s\u1ed1 n\u1ea5m \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m th\u1ee9c \u0103n v\u00e0 chia s\u1ebb v\u1ec1 h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc c\u1ee7a ch\u00fang. + K\u1ec3 t\u00ean m\u1ed9t s\u1ed1 n\u1ea5m \u0103n c\u00f3 \u1edf \u0111\u1ecba ph\u01b0\u01a1ng em. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS tr\u1ea3 l\u1eddi. \u2013 C\u00e1c HS kh\u00e1c nh\u1eadn x\u00e9t v\u00e0 b\u1ed5 sung. \u2013 GV co\u0301 th\u00ea\u0309 cho HS \u0111o\u0323c th\u00f4ng tin \u1edf mu\u0323c Em t\u00ecm hi\u1ec3u th\u00eam \u0111\u00ea\u0309 bi\u1ebft th\u00eam v\u1ec1 vai tr\u00f2 c\u1ee7a n\u1ea5m \u0103n \u0111\u1ed1i v\u1edbi \u0111\u1eddi s\u1ed1ng con ng\u01b0\u1eddi. * K\u1ebft lu\u1eadn: N\u1ea5m \u0103n c\u00f3 nhi\u1ec1u h\u00ecnh d\u1ea1ng (h\u00ecnh tr\u00f2n, h\u00ecnh que,\u2026) v\u00e0 nhi\u1ec1u m\u00e0u s\u1eafc (m\u00e0u n\u00e2u, tr\u1eafng,\u2026). C\u00f3 r\u1ea5t nhi\u1ec1u n\u1ea5m \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m th\u1ee9c \u0103n nh\u01b0 n\u1ea5m h\u01b0\u01a1ng, n\u1ea5m m\u1ee1, n\u1ea5m r\u01a1m, n\u1ea5m s\u00f2, n\u1ea5m ch\u00e2n d\u00e0i, n\u1ea5m m\u1ed9c nh\u0129 (n\u1ea5m tai m\u00e8o),... * Th\u00f4ng tin d\u00e0nh cho GV: Nhi\u1ec1u lo\u00e0i n\u1ea5m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00f4ng ngh\u1ec7 th\u1ef1c ph\u1ea9m, l\u00e0m th\u1ee9c \u0103n ho\u1eb7c d\u00f9ng trong qu\u00e1 tr\u00ecnh l\u00ean men. N\u1ea5m c\u00f2n \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t ch\u1ea5t kh\u00e1ng sinh, h\u00f3c-m\u00f4n trong y h\u1ecdc v\u00e0 nhi\u1ec1u lo\u1ea1i enzyme.\u00a0 M\u1ed9t s\u1ed1 lo\u00e0i n\u1ea5m c\u00f3 th\u1ec3 g\u00e2y b\u1ec7nh cho con ng\u01b0\u1eddi v\u00e0 \u0111\u1ed9ng v\u1eadt; ch\u00fang c\u00f3 th\u1ec3 g\u00e2y ra b\u1ec7nh d\u1ecbch cho c\u00e2y tr\u1ed3ng, m\u00f9a m\u00e0ng, g\u00e2y t\u00e1c \u0111\u1ed9ng l\u1edbn \u0111\u1ebfn l\u01b0\u01a1ng th\u1ef1c v\u00e0 kinh t\u1ebf. N\u1ea5m c\u00f3 \u1edf t\u1ea5t c\u1ea3 c\u00e1c m\u00f4i tr\u01b0\u1eddng tr\u00ean Tr\u00e1i \u0110\u1ea5t, \u0111\u00f3ng vai tr\u00f2 r\u1ea5t quan tr\u1ecdng trong h\u1ec7 sinh th\u00e1i. C\u00f9ng v\u1edbi vi khu\u1ea9n, n\u1ea5m l\u00e0 sinh v\u1eadt ph\u00e2n hu\u1ef7 ch\u00ednh \u1edf h\u1ea7u h\u1ebft c\u00e1c h\u1ec7 sinh th\u00e1i tr\u00ean c\u1ea1n v\u00e0 m\u1ed9t s\u1ed1 h\u1ec7 sinh th\u00e1i \u1edf d\u01b0\u1edbi n\u01b0\u1edbc, do \u0111\u00f3 n\u1ea5m c\u00f3 vai tr\u00f2 quan tr\u1ecdng trong c\u00e1c chu tr\u00ecnh sinh \u0111\u1ecba ho\u00e1 v\u00e0 \u1edf nhi\u1ec1u l\u01b0\u1edbi th\u1ee9c \u0103n. 119","Ho\u1ea1t \u0111\u1ed9ng 2: Em t\u1eadp l\u00e0m \u0111\u1ea7u b\u1ebfp * M\u1ee5c ti\u00eau: Ki\u00ea\u0309m tra hi\u00ea\u0309u bi\u00ea\u0301t cu\u0309a HS v\u1ec1 t\u00ean, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 m\u00f3n \u0103n \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb m\u1ed9t s\u1ed1 n\u1ea5m \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m th\u1ee9c \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u HS th\u1ea3o lu\u1eadn v\u00e0 ho\u00e0n th\u00e0nh b\u1ea3ng nh\u01b0 m\u1eabu g\u1ee3i \u00fd (SGK, trang 77) b\u1eb1ng c\u00e1ch k\u1ec3 t\u00ean c\u00e1c n\u1ea5m \u0103n v\u00e0 n\u00eau \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh d\u1ea1ng, m\u00e0u s\u1eafc, m\u00f3n \u0103n c\u00f3 th\u1ec3 ch\u1ebf bi\u1ebfn t\u1eeb n\u1ea5m \u0103n \u0111\u00f3. \u2013 GV m\u1eddi 2 \u2013 3 HS b\u1ea5t k\u00ec \u0111\u1ea1i di\u1ec7n c\u00e1c nh\u00f3m chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t va\u0300 co\u0301 th\u00eam nh\u01b0\u0303ng y\u0301 m\u01a1\u0301i, sa\u0301ng ta\u0323o,... \u2013 GV c\u00f3 th\u1ec3 h\u01b0\u1edbng d\u1eabn HS \u0111\u1ecdc th\u00f4ng tin trong m\u1ee5c Em t\u00ecm hi\u1ec3u th\u00eam. GV d\u1eabn d\u1eaft HS c\u00f9ng r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: C\u00f3 r\u1ea5t nhi\u1ec1u n\u1ea5m \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m th\u1ee9c \u0103n b\u1ed5 d\u01b0\u1ee1ng nh\u01b0 n\u1ea5m h\u01b0\u01a1ng, n\u1ea5m m\u1ee1, n\u1ea5m r\u01a1m, n\u1ea5m s\u00f2, n\u1ea5m ch\u00e2n d\u00e0i, n\u1ea5m tai m\u00e8o (m\u1ed9c nh\u0129),\u2026 Ch\u00fang ta c\u1ea7n k\u1ebft h\u1ee3p n\u1ea5m v\u1edbi c\u00e1c lo\u1ea1i th\u1ef1c ph\u1ea9m kh\u00e1c \u0111\u1ec3 ch\u1ebf bi\u1ebfn \u0111\u01b0\u1ee3c c\u00e1c m\u00f3n \u0103n ngon v\u00e0 b\u1ed5 d\u01b0\u1ee1ng. Ho\u1ea1t \u0111\u1ed9ng 3: T\u00ecm hi\u1ec3u \u00edch l\u1ee3i c\u1ee7a m\u1ed9t s\u1ed1 n\u1ea5m men trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m * M\u1ee5c ti\u00eau: HS nh\u00e2\u0323n bi\u00ea\u0301t \u00edch l\u1ee3i c\u1ee7a m\u1ed9t s\u1ed1 n\u1ea5m men trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c nh\u00f3m \u0111\u00f4i, GV h\u01b0\u1edbng d\u1eabn HS quan s\u00e1t c\u00e1c h\u00ecnh 8a, 8b, 8c, 9a, 9b, 9c (SGK, trang 78) v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c nhi\u1ec7m v\u1ee5 sau: + K\u1ec3 t\u00ean m\u1ed9t s\u1ed1 s\u1ea3n ph\u1ea9m s\u1eed d\u1ee5ng n\u1ea5m men khi ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m trong c\u00e1c h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y. + N\u1ea5m men c\u00f3 nh\u1eefng \u00edch l\u1ee3i g\u00ec? \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS k\u1ec3 t\u00ean v\u00e0 n\u00eau \u00edch l\u1ee3i c\u1ee7a n\u1ea5m men tr\u01b0\u1edbc l\u1edbp. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, \u0111\u01b0a ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u01a1\u0323i nho\u0301m k\u1ec3 \u0111\u01b0\u01a1\u0323c nhi\u00ea\u0300u t\u00ean s\u1ea3n ph\u1ea9m s\u1eed d\u1ee5ng n\u1ea5m men khi ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m v\u00e0 \u00edch l\u1ee3i c\u1ee7a ch\u00fang. * K\u1ebft lu\u1eadn: N\u1ea5m men \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m b\u00e1nh m\u00ec, b\u00e1nh bao, b\u00e1nh ng\u1ecdt, r\u01b0\u1ee3u, bia,\u2026 N\u1ea5m men c\u00f3 nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m, vi-ta-min B v\u00e0 c\u00e1c ch\u1ea5t kho\u00e1ng. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u m\u1ed7i nh\u00f3m v\u1ec1 nh\u00e0 chu\u1ea9n b\u1ecb nguy\u00ean li\u1ec7u, d\u1ee5ng c\u1ee5 trong m\u1ee5c \u201cT\u00ecm hi\u1ec3u t\u00e1c d\u1ee5ng c\u1ee7a n\u1ea5m men v\u1edbi b\u1ed9t m\u00ec\u201d (SGK, trang 79) \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft h\u1ecdc m\u1edbi. 120","Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa, kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 n\u1ea5m men. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS ch\u01a1i tr\u00f2 ch\u01a1i \u0111o\u00e1n t\u00ean th\u1ee9c \u0103n theo nh\u00f3m, GV chi\u1ebfu l\u00ean b\u1ea3ng m\u1ed9t s\u1ed1 h\u00ecnh \u1ea3nh th\u1ee9c \u0103n \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb n\u1ea5m men v\u00e0 cho HS xung phong \u0111o\u00e1n t\u00ean th\u1ee9c \u0103n \u0111\u00f3. Nh\u00f3m n\u00e0o \u0111o\u00e1n \u0111\u00fang nhi\u1ec1u nh\u1ea5t s\u1ebd gi\u00e0nh chi\u1ebfn th\u1eafng. \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: Kh\u00e1m ph\u00e1 nh\u1eefng s\u1ea3n ph\u1ea9m c\u00f3 \u1ee9ng d\u1ee5ng n\u1ea5m men trong s\u1ea3n xu\u1ea5t m\u00e0 gia \u0111\u00ecnh em s\u1eed d\u1ee5ng * M\u1ee5c ti\u00eau: HS gh\u00e9p \u0111\u01b0\u1ee3c t\u00ean nh\u1eefng s\u1ea3n ph\u1ea9m c\u00f3 \u1ee9ng d\u1ee5ng n\u1ea5m men v\u1edbi h\u00ecnh; chia s\u1ebb \u0111\u01b0\u1ee3c th\u1ee9c \u0103n l\u00e0m t\u1eeb n\u1ea5m \u0103n trong \u0111\u1eddi s\u1ed1ng h\u1eb1ng ng\u00e0y. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan s\u00e1t c\u00e1c h\u00ecnh 10, 11, 12 (SGK, trang 79). \u2013 GV h\u01b0\u1edbng d\u1eabn HS l\u00e0m vi\u1ec7c theo nh\u00f3m 4, y\u00eau c\u1ea7u HS gh\u00e9p t\u00ean nh\u1eefng s\u1ea3n ph\u1ea9m c\u00f3 \u1ee9ng d\u1ee5ng n\u1ea5m men trong s\u1ea3n xu\u1ea5t v\u1edbi m\u1ed7i h\u00ecnh cho ph\u00f9 h\u1ee3p. \u2013 GV m\u1eddi 2 \u2013 3 \u0111\u1ea1i di\u1ec7n nh\u00f3m n\u00f3i t\u00ean c\u00e1c th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c con ng\u01b0\u1eddi \u1ee9ng d\u1ee5ng n\u1ea5m men v\u00e0o s\u1ea3n xu\u1ea5t tr\u01b0\u1edbc l\u1edbp. \u2013 GV khuy\u1ebfn kh\u00edch HS t\u00ecm th\u00eam c\u00e1c s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c con ng\u01b0\u1eddi \u1ee9ng d\u1ee5ng n\u1ea5m men (l\u00e0m b\u1ed9t n\u00eam, r\u01b0\u1ee3u vang, r\u01b0\u1ee3u c\u1ea7n, n\u01b0\u1edbc ng\u1ecdt gi\u1ea3i kh\u00e1t, bia,...) m\u00e0 gia \u0111\u00ecnh em s\u1eed d\u1ee5ng trong \u0111\u1eddi s\u1ed1ng h\u1eb1ng ng\u00e0y v\u00e0 chia s\u1ebb v\u1edbi b\u1ea1n. \u2013 GV khen ng\u01a1\u0323i nho\u0301m tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi \u0111\u00fang v\u00e0 t\u00ecm \u0111\u01b0\u1ee3c nhi\u1ec1u th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb n\u1ea5m men. * K\u1ebft lu\u1eadn: N\u1ea5m men \u0111\u01b0\u1ee3c con ng\u01b0\u1eddi \u1ee9ng d\u1ee5ng nhi\u1ec1u trong \u0111\u1eddi s\u1ed1ng nh\u01b0 s\u1ea3n xu\u1ea5t r\u01b0\u1ee3u (r\u01b0\u1ee3u c\u1ea7n, r\u01b0\u1ee3u n\u1ebfp,\u2026), bia, n\u01b0\u1edbc gi\u1ea3i kh\u00e1t, b\u1ed9t n\u00eam,\u2026 Ho\u1ea1t \u0111\u1ed9ng 2: Em t\u1eadp la\u0300m nha\u0300 khoa ho\u0323c: \u201cT\u00ecm hi\u1ec3u t\u00e1c d\u1ee5ng c\u1ee7a n\u1ea5m men v\u1edbi b\u1ed9t m\u00ec\u201d * M\u1ee5c ti\u00eau: HS \u0111\u1ecdc, ph\u00e2n t\u00edch th\u00ed nghi\u1ec7m; th\u1ef1c h\u00e0nh, \u0111\u01b0a ra nh\u1eadn x\u00e9t v\u00e0 gi\u1ea3i th\u00edch \u0111\u01b0\u1ee3c hi\u1ec7n t\u01b0\u1ee3ng v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a n\u1ea5m men trong qu\u00e1 tr\u00ecnh l\u00e0m b\u00e1nh m\u00ec,.... * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u HS \u0111\u1ecdc m\u00f4 t\u1ea3 c\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n trong m\u1ee5c Em t\u1eadp l\u00e0m nh\u00e0 khoa h\u1ecdc v\u00e0 quan s\u00e1t h\u00ecnh 13, 14 (SGK, trang 79). \u2013 GV h\u01b0\u1edbng d\u1eabn HS th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m theo nh\u00f3m. GV l\u01b0u \u00fd HS c\u1ea7n th\u1ef1c hi\u1ec7n theo \u0111\u00fang th\u1ee9 t\u1ef1: b\u00e1t \u0111\u1ed1i ch\u1ee9ng tr\u01b0\u1edbc, b\u00e1t th\u00ed nghi\u1ec7m sau. \u2013 GV m\u1eddi 2 \u2013 3 \u0111\u1ea1i di\u1ec7n nh\u00f3m l\u00ean tr\u01b0ng b\u00e0y s\u1ea3n ph\u1ea9m tr\u01b0\u1edbc l\u1edbp. \u2013 GV h\u01b0\u1edbng d\u1eabn HS quan s\u00e1t kh\u1ed1i b\u1ed9t m\u00ec \u0111\u00e3 tr\u1ed9n n\u1ea5m men sau 30 ph\u00fat, y\u00eau c\u1ea7u HS so s\u00e1nh s\u1ef1 kh\u00e1c bi\u1ec7t v\u1edbi kh\u1ed1i b\u1ed9t m\u00ec kh\u00f4ng tr\u1ed9n n\u1ea5m men v\u00e0 gi\u1ea3i th\u00edch k\u1ebft qu\u1ea3. 121","\u2013 GV m\u1eddi c\u00e1c nh\u00f3m kh\u00e1c nh\u1eadn x\u00e9t, GV khen ng\u1ee3i nh\u00f3m th\u1ef1c hi\u1ec7n \u0111\u00fang c\u00e1c b\u01b0\u1edbc th\u00ed nghi\u1ec7m v\u00e0 \u0111\u01b0a ra l\u1eddi gi\u1ea3i th\u00edch ch\u00ednh x\u00e1c. \u2013 Tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng c\u00f3 \u0111i\u1ec1u ki\u1ec7n t\u1ed5 ch\u1ee9c th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m t\u1ea1i l\u1edbp, GV c\u00f3 th\u1ec3 chi\u1ebfu l\u00ean b\u1ea3ng cho HS quan s\u00e1t h\u00ecnh \u1ea3nh trong SGK ho\u1eb7c GV chu\u1ea9n b\u1ecb m\u1eabu s\u1ea3n ph\u1ea9m th\u00ed nghi\u1ec7m r\u1ed3i cho HS quan s\u00e1t, nh\u1eadn x\u00e9t. \u2013 GV c\u00f9ng HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: \u2013 N\u1ea5m men c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m t\u0103ng \u0111\u1ed9 n\u1edf cho th\u1ef1c ph\u1ea9m nh\u01b0 b\u00e1nh m\u00ec, b\u00e1nh bao,\u2026 gi\u00fap cho b\u00e1nh ph\u1ed3ng, x\u1ed1p m\u1ec1m h\u01a1n. \u2013 GV g\u1ee3i \u00fd v\u00e0 d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c c\u00e1c t\u1eeb kho\u00e1 trong b\u00e0i: N\u1ea5m \u0103n \u2013 N\u1ea5m men. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc \u2013 GV khuy\u1ebfn kh\u00edch HS v\u1ec1 nh\u00e0 t\u1ef1 l\u00e0m b\u00e1nh m\u00ec, b\u00e1nh bao \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n vai tr\u00f2 c\u1ee7a n\u1ea5m men. \u2013 GV h\u01b0\u1edbng d\u1eabn HS mua hai mi\u1ebfng b\u00e1nh m\u00ec c\u00f9ng th\u1eddi \u0111i\u1ec3m s\u1ea3n xu\u1ea5t v\u00e0 th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m: + M\u1ed9t mi\u1ebfng b\u00e1nh m\u00ec c\u00f3 r\u01b0\u1edbi ch\u00fat n\u01b0\u1edbc \u0111\u1eb7t \u1edf nhi\u1ec7t \u0111\u1ed9 b\u00ean ngo\u00e0i. + M\u1ed9t mi\u1ebfng b\u00e1nh m\u00ec \u0111\u1ec3 trong t\u1ee7 l\u1ea1nh. \u2013 GV y\u00eau c\u1ea7u quan s\u00e1t s\u1ef1 thay \u0111\u1ed5i c\u1ee7a hai mi\u1ebfng b\u00e1nh trong \u0111i\u1ec1u ki\u1ec7n kh\u00e1c nhau sau t\u1eeb 3 \u0111\u1ebfn 5 ng\u00e0y. B\u00e0i 21. N\u1ea4M C\u00d3 H\u1ea0I V\u00c0 C\u00c1CH B\u1ea2O QU\u1ea2N TH\u1ef0C PH\u1ea8M (2 ti\u1ebft) I. y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2013 Nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c t\u00e1c h\u1ea1i c\u1ee7a m\u1ed9t s\u1ed1 n\u1ea5m m\u1ed1c g\u00e2y h\u1ecfng th\u1ef1c ph\u1ea9m th\u00f4ng qua th\u00ed nghi\u1ec7m ho\u1eb7c quan s\u00e1t tranh \u1ea3nh, video. \u2013 C\u00f3 \u00fd th\u1ee9c kh\u00f4ng \u0103n n\u1ea5m l\u1ea1 \u0111\u1ec3 ph\u00f2ng tr\u00e1nh ng\u1ed9 \u0111\u1ed9c. \u2013 V\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c v\u1ec1 nguy\u00ean nh\u00e2n g\u00e2y h\u1ecfng th\u1ef1c ph\u1ea9m, n\u00eau \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m (l\u00e0m l\u1ea1nh, s\u1ea5y kh\u00f4, \u01b0\u1edbp mu\u1ed1i,...). II. \u0111\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 21 SGK, phi\u1ebfu h\u1ecdc t\u1eadp, th\u1ebb t\u1eeb c\u00f3 t\u00ean th\u1ef1c ph\u1ea9m trong tr\u00f2 ch\u01a1i \u201cTh\u1ef1c ph\u1ea9m \u2013 B\u1ea3o qu\u1ea3n\u201d. \u2013 HS: SGK, VBT. 122","III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: Kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 m\u1ed9t s\u1ed1 th\u1ef1c ph\u1ea9m \u0111\u00e3 b\u1ecb h\u1ecfng do n\u1ea5m m\u1ed1c, \u1ea3nh h\u01b0\u1edfng t\u1edbi s\u1ee9c kho\u1ebb. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS c\u1ee7a t\u1eebng nh\u00f3m quan sa\u0301t hi\u0300nh 1 trong SGK trang 80. \u2013 GV m\u1eddi t\u1eebng c\u1eb7p HS, m\u1ed9t b\u1ea1n \u0111\u1eb7t c\u00e2u h\u1ecfi, m\u1ed9t b\u1ea1n tr\u1ea3 l\u1eddi: V\u00ed d\u1ee5: + B\u1ea1n A \u0111\u1eb7t c\u00e2u h\u1ecfi: \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu ch\u00fang ta \u0103n ph\u1ea3i c\u01a1m \u1edf h\u00ecnh 1? + B\u1ea1n B tr\u1ea3 l\u1eddi: Th\u1ee9c \u0103n \u1edf h\u00ecnh 1 b\u1ecb \u00f4i thiu, do \u0111\u00f3 ch\u00fang ta \u0103n v\u00e0o c\u00f3 th\u1ec3 b\u1ecb ng\u1ed9 \u0111\u1ed9c,\u2026 \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cN\u1ea5m c\u00f3 h\u1ea1i v\u00e0 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u t\u00e1c h\u1ea1i c\u1ee7a n\u1ea5m \u0111\u1ed9c v\u00e0 n\u1ea5m m\u1ed1c * M\u1ee5c ti\u00eau: HS nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c t\u00e1c h\u1ea1i c\u1ee7a n\u1ea5m \u0111\u1ed9c v\u00e0 m\u1ed9t s\u1ed1 n\u1ea5m m\u1ed1c. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m \u0111\u00f4i, sau \u0111\u00f3 t\u1ed5 ch\u1ee9c cho HS c\u1ee7a t\u1eebng nh\u00f3m quan sa\u0301t, \u0111\u1ecdc th\u00f4ng tin trong c\u00e1c hi\u0300nh 2, 3, 4, 5, 6, 7 trong SGK trang 80, 81 va\u0300 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: + N\u1ea5m \u0111\u1ed9c c\u00f3 t\u00e1c h\u1ea1i g\u00ec? + V\u00ec sao ch\u00fang ta kh\u00f4ng \u0103n n\u1ea5m l\u1ea1? \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS l\u00ean tr\u01b0\u1edbc l\u1edbp h\u1ecfi v\u00e0 tr\u1ea3 l\u1eddi. \u2013 C\u00e1c HS c\u00f2n l\u1ea1i nh\u1eadn x\u00e9t v\u00e0 b\u1ed5 sung. L\u01b0u \u00fd: GV c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c cho HS \u0111\u00f3ng vai \u201cN\u1ea5m \u0111\u1ed9c\u201d, \u201cN\u1ea5m m\u1ed1c\u201d v\u00e0 n\u00f3i v\u1ec1 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m, m\u00e0u s\u1eafc, t\u00e1c h\u1ea1i,\u2026 c\u1ee7a ch\u00fang. GV c\u00f3 th\u1ec3 s\u00e1ng t\u1ea1o th\u00eam c\u00e1c ho\u1ea1t \u0111\u1ed9ng kh\u00e1c sao cho h\u1ea5p d\u1eabn, ph\u00f9 h\u1ee3p v\u1edbi HS c\u1ee7a l\u1edbp, \u0111\u1ea3m b\u1ea3o ph\u00e1t huy n\u0103ng l\u1ef1c c\u1ee7a HS. \u2013 GV co\u0301 th\u00ea\u0309 h\u01b0\u1edbng d\u1eabn HS \u0111o\u0323c th\u00f4ng tin \u1edf mu\u0323c Em t\u00ecm hi\u1ec3u th\u00eam \u0111\u00ea\u0309 bi\u1ebft th\u00eam v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a n\u1ea5m \u0111\u1ed9c v\u00e0 m\u1ed9t s\u1ed1 n\u1ea5m m\u1ed1c c\u00f3 \u00edch, \u0111\u01b0\u1ee3c d\u00f9ng trong s\u1ea3n xu\u1ea5t \u0111\u1ec3 ph\u1ee5c v\u1ee5 \u0111\u1eddi s\u1ed1ng. * K\u1ebft lu\u1eadn: N\u1ea5m \u0111\u1ed9c v\u00e0 th\u1ef1c ph\u1ea9m nhi\u1ec5m n\u1ea5m m\u1ed1c r\u1ea5t nguy hi\u1ec3m, \u1ea3nh h\u01b0\u1edfng x\u1ea5u t\u1edbi s\u1ee9c kho\u1ebb con ng\u01b0\u1eddi. * Th\u00f4ng tin d\u00e0nh cho GV: N\u00f3i \u0111\u1ebfn ng\u1ed9 \u0111\u1ed9c th\u1ef1c ph\u1ea9m v\u00e0 b\u1ec7nh l\u00e2y truy\u1ec1n qua th\u1ef1c ph\u1ea9m, ng\u01b0\u1eddi ta th\u01b0\u1eddng ch\u1ec9 ngh\u0129 \u0111\u1ebfn c\u00e1c ch\u1ea5t \u0111\u1ed9c c\u00f3 trong th\u1ef1c ph\u1ea9m v\u00e0 vai tr\u00f2 c\u1ee7a c\u00e1c vi khu\u1ea9n g\u00e2y b\u1ec7nh, \u00edt khi \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c n\u1ea5m m\u1ed1c v\u00e0 \u0111\u1ed9c t\u1ed1 c\u1ee7a ch\u00fang. Trong th\u1ef1c t\u1ebf, c\u00e1c b\u1ec7nh do \u0111\u1ed9c t\u1ed1 n\u1ea5m g\u00e2y ra l\u00e0 kh\u00f4ng nh\u1ecf. Hi\u1ec7n nay, khoa h\u1ecdc \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng n\u1ebfu ch\u00fang ta \u0103n ph\u1ea3i nh\u1eefng th\u1ee9c \u0103n nhi\u1ec5m n\u1ea5m m\u1ed1c c\u00f3 th\u1ec3 m\u1eafc b\u1ec7nh nguy hi\u1ec3m, ng\u01b0\u1eddi b\u1ec7nh c\u00f3 th\u1ec3 b\u1ecb ng\u1ed9 \u0111\u1ed9c c\u1ea5p t\u00ednh, nh\u01b0ng ph\u1ea7n l\u1edbn th\u01b0\u1eddng g\u1eb7p l\u00e0 ng\u1ed9 \u0111\u1ed9c m\u00e3n t\u00ednh do c\u01a1 th\u1ec3 t\u00edch lu\u1ef9 d\u1ea7n nh\u1eefng l\u01b0\u1ee3ng nh\u1ecf\u00a0\u0111\u1ed9c t\u1ed1 n\u1ea5m. 123","Ng\u01b0\u1eddi ta \u01b0\u1edbc t\u00ednh c\u00f3 kho\u1ea3ng g\u1ea7n 40% s\u1ed1 lo\u00e0i n\u1ea5m m\u1ed1c c\u00f3 th\u1ec3 s\u1ea3n sinh ra \u0111\u1ed9c t\u1ed1, nguy hi\u1ec3m cho s\u1ee9c kho\u1ebb con ng\u01b0\u1eddi. C\u00e1c \u0111\u1ed9c t\u1ed1 c\u1ee7a n\u1ea5m \u0111\u1ec1u \u0111\u1ed9c nh\u01b0ng m\u1ee9c \u0111\u1ed9 \u0111\u1ed9c kh\u00e1c nhau, v\u00ec v\u1eady ch\u00fang g\u00e2y b\u1ec7nh kh\u00f4ng gi\u1ed1ng nhau khi x\u00e2m nh\u1eadp v\u00e0o c\u01a1 th\u1ec3. V\u1edbi nh\u1eefng lo\u1ea1i \u00edt \u0111\u1ed9c, m\u1ed9t li\u1ec1u l\u01b0\u1ee3ng nh\u1ecf \u0111\u1ed9c t\u1ed1 n\u1ea5m ch\u1ec9 g\u00e2y ng\u1ed9 \u0111\u1ed9c nh\u1eb9, ng\u01b0\u1eddi b\u1ec7nh b\u1ecb n\u00f4n m\u1eeda, ti\u00eau ch\u1ea3y, cho\u00e1ng v\u00e1ng,\u2026; nh\u1eefng \u0111\u1ed9c t\u1ed1 vi n\u1ea5m t\u00edch lu\u1ef9 d\u1ea7n trong c\u01a1 th\u1ec3 l\u00e2u d\u1ea7n d\u1eabn \u0111\u1ebfn m\u1eafc c\u00e1c b\u1ec7nh nguy hi\u1ec3m nh\u01b0 ung th\u01b0 gan, suy th\u1eadn, ung th\u01b0 bu\u1ed3ng tr\u1ee9ng,\u2026 B\u00e1nh ch\u01b0ng ngon v\u00e0 b\u1ed5 d\u01b0\u1ee1ng nh\u01b0ng n\u1ebfu \u0111\u00e3 b\u1ecb chua v\u00e0 m\u1ed1c th\u00ec \u0103n v\u00e0o s\u1ebd g\u1eb7p nguy hi\u1ec3m. Do b\u00e1nh ch\u01b0ng c\u00f3 \u0111\u1ed9 \u1ea9m cao v\u00e0 gi\u00e0u ch\u1ea5t dinh d\u01b0\u1ee1ng n\u00ean \u0111\u00e2y l\u00e0 m\u00f4i tr\u01b0\u1eddng th\u00edch h\u1ee3p cho n\u1ea5m m\u1ed1c ph\u00e1t tri\u1ec3n, v\u00ec v\u1eady b\u00e1nh ch\u01b0ng \u0111\u1ec3 l\u00e2u d\u1ec5 b\u1ecb m\u1ed1c. T\u1eeb l\u1edbp l\u00e1 \u1edf ngo\u00e0i, n\u1ea5m m\u1ed1c ph\u00e1t tri\u1ec3n v\u00e0o b\u00ean trong, lan r\u1ed9ng ra v\u00e0 l\u00e0m h\u1ecfng b\u00e1nh. D\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a men a-mi-la-za c\u00f3 trong m\u1ed9t s\u1ed1 n\u1ea5m m\u1ed1c, tinh b\u1ed9t b\u1ecb bi\u1ebfn \u0111\u1ed5i th\u00e0nh \u0111\u01b0\u1eddng glu-c\u00f4-z\u01a1, n\u1ea5m men \u0103n \u0111\u01b0\u1eddng n\u00e0y v\u00e0 chuy\u1ec3n n\u00f3 th\u00e0nh r\u01b0\u1ee3u \u00ea-ti-lic, l\u00e0m b\u00e1nh b\u1ecb v\u1eefa t\u1ea1i n\u01a1i n\u1ea5m ph\u00e1t tri\u1ec3n; c\u00f3 v\u1ecb cay, h\u0103ng m\u00f9i r\u01b0\u1ee3u.\u00a0 Ho\u1ea1t \u0111\u1ed9ng 2: C\u00f9ng th\u1ea3o lu\u1eadn * M\u1ee5c ti\u00eau: Ki\u00ea\u0309m tra hi\u00ea\u0309u bi\u00ea\u0301t cu\u0309a HS v\u1ec1 vi\u1ec7c kh\u00f4ng n\u00ean \u0103n n\u1ea5m l\u1ea1, n\u1ea5m m\u1ed1c v\u00e0 c\u00e1ch ph\u00f2ng tr\u00e1nh do ng\u1ed9 \u0111\u1ed9c n\u1ea5m l\u1ea1 g\u00e2y ra; \u0111\u1ed3ng th\u1eddi ph\u00e1t tri\u1ec3n n\u0103ng l\u1ef1c thuy\u1ebft tr\u00ecnh cho HS. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS th\u1ea3o lu\u1eadn theo nh\u00f3m 4 v\u00e0 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: V\u00ec sao ch\u00fang ta kh\u00f4ng \u0103n n\u1ea5m l\u1ea1 v\u00e0 th\u1ef1c ph\u1ea9m nhi\u1ec5m n\u1ea5m m\u1ed1c? C\u1ea7n l\u00e0m g\u00ec \u0111\u1ec3 ph\u00f2ng tr\u00e1nh ng\u1ed9 \u0111\u1ed9c do n\u1ea5m l\u1ea1 g\u00e2y ra? \u2013 GV m\u1eddi 2 \u2013 3 HS \u0111\u1ea1i di\u1ec7n c\u00e1c nh\u00f3m l\u00ean chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t, co\u0301 y\u0301 m\u01a1\u0301i, sa\u0301ng ta\u0323o,... * K\u1ebft lu\u1eadn: C\u1ea7n l\u1ef1a ch\u1ecdn nh\u1eefng n\u1ea5m \u0103n r\u00f5 ngu\u1ed3n g\u1ed1c. Kh\u00f4ng \u0103n n\u1ea5m l\u1ea1 v\u00e0 nh\u1eefng th\u1ef1c ph\u1ea9m \u0111\u00e3 qu\u00e1 h\u1ea1n s\u1eed d\u1ee5ng, c\u00f3 m\u00e0u v\u00e0 m\u00f9i l\u1ea1,\u2026 Khi b\u1ecb ng\u1ed9 \u0111\u1ed9c c\u1ea7n \u0111\u1ebfn c\u01a1 s\u1edf y t\u1ebf g\u1ea7n nh\u1ea5t \u0111\u1ec3 \u0111i\u1ec1u tr\u1ecb k\u1ecbp th\u1eddi. * Th\u00f4ng tin d\u00e0nh cho GV: N\u1ea5m \u0111\u1ed9c v\u00e0 n\u1ea5m m\u1ed1c g\u00e2y nguy hi\u1ec3m, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ee9c kho\u1ebb con ng\u01b0\u1eddi nh\u01b0 ng\u1ed9 \u0111\u1ed9c, n\u00f4n m\u1eeda,\u2026, tr\u01b0\u1eddng h\u1ee3p n\u1eb7ng c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u1eed vong. N\u1ea5m m\u1ed1c t\u00edch lu\u1ef9 trong c\u01a1 th\u1ec3 l\u00e2u d\u1ea7n c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ung th\u01b0,\u2026 \u0110\u1ec3 ng\u0103n ng\u1eeba t\u00ecnh tr\u1ea1ng ng\u1ed9 \u0111\u1ed9c do \u0103n ph\u1ea3i \u0111\u1ed9c t\u1ed1 c\u1ee7a vi n\u1ea5m, c\u1ea7n \u00e1p d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p ph\u00f2ng\u00a0tr\u00e1nh nh\u01b0: kh\u00f4ng mua v\u00e0\u00a0s\u1eed d\u1ee5ng\u00a0c\u00e1c lo\u1ea1i\u00a0l\u01b0\u01a1ng th\u1ef1c, th\u1ef1c ph\u1ea9m\u00a0\u0111\u00e3 b\u1ecb m\u1ed1c nh\u01b0: l\u1ea1c, \u0111\u1eadu n\u00e0nh, g\u1ea1o, ng\u00f4, b\u00e1nh ng\u1ecdt, m\u1ee9t,...; kh\u00f4ng r\u1eeda c\u00e1c\u00a0l\u01b0\u01a1ng th\u1ef1c, th\u1ef1c ph\u1ea9m \u0111\u00e3 b\u1ecb\u00a0m\u1ed1c \u0111\u1ec3 s\u1eed d\u1ee5ng tr\u1edf l\u1ea1i v\u00ec \u0111\u1ed9c t\u1ed1 c\u00f2n t\u1ed3n t\u1ea1i b\u00ean trong; khi s\u1eed d\u1ee5ng th\u1ef1c ph\u1ea9m nhi\u1ec5m \u0111\u1ed9c ho\u1eb7c c\u00f3 d\u1ea5u hi\u1ec7u b\u1ecb ng\u1ed9 \u0111\u1ed9c th\u1ee9c \u0103n ho\u1eb7c nghi ng\u1edd b\u1ecb ng\u1ed9 \u0111\u1ed9c th\u00ec c\u1ea7n d\u1eebng ngay vi\u1ec7c s\u1eed d\u1ee5ng th\u1ee9c \u0103n \u0111\u00f3, \u0111\u1ed3ng th\u1eddi gi\u1eef to\u00e0n b\u1ed9 th\u1ee9c \u0103n th\u1eeba, ch\u1ea5t n\u00f4n, ph\u00e2n, n\u01b0\u1edbc ti\u1ec3u,\u2026 \u0111\u1ec3 mang \u0111i x\u00e9t nghi\u1ec7m, b\u00e1o ngay cho c\u01a1 s\u1edf y t\u1ebf g\u1ea7n nh\u1ea5t \u0111\u1ec3 \u0111i\u1ec1u tra, x\u00e1c minh v\u00e0 k\u1ecbp th\u1eddi t\u1ed5 ch\u1ee9c c\u1ea5p c\u1ee9u ng\u01b0\u1eddi ng\u1ed9 \u0111\u1ed9c. \u0110i\u1ec1u \u0111\u1ea7u ti\u00ean c\u1ea7n l\u00e0m khi c\u1ea5p c\u1ee9u ng\u01b0\u1eddi b\u1ecb ng\u1ed9 \u0111\u1ed9c l\u00e0 l\u00e0m cho ng\u01b0\u1eddi b\u1ecb ng\u1ed9 \u0111\u1ed9c n\u00f4n ra h\u1ebft nh\u1eefng g\u00ec \u0111\u00e3 \u0103n v\u00e0o nh\u1eb1m ng\u0103n c\u1ea3n s\u1ef1 h\u1ea5p thu c\u1ee7a ru\u1ed9t v\u1edbi ch\u1ea5t \u0111\u1ed9c, ph\u00e1 hu\u1ef7 \u0111\u1ed9c t\u00ednh, \u0111\u1ed3ng th\u1eddi b\u1ea3o v\u1ec7 ni\u00eam m\u1ea1c d\u1ea1 d\u00e0y. 124","Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 t\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 nguy\u00ean nh\u00e2n g\u00e2y h\u1ecfng th\u1ef1c ph\u1ea9m \u0111ang s\u1eed d\u1ee5ng trong gia \u0111\u00ecnh v\u00e0 c\u00e1c c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m t\u1ea1i nh\u00e0. Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa, kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 m\u00f4\u0323t s\u00f4\u0301 th\u1ef1c ph\u1ea9m b\u1ecb n\u1ea5m m\u1ed1c v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV m\u1eddi 4 \u2013 5 HS b\u1ea5t k\u00ec k\u1ec3 t\u00ean m\u1ed9t s\u1ed1 th\u1ee9c \u0103n b\u1ecb n\u1ea5m m\u1ed1c \u1edf nh\u00e0 m\u00e0 em t\u1eebng nh\u00ecn th\u1ea5y v\u00e0 chia s\u1ebb ho\u1eb7c d\u1ef1 \u0111o\u00e1n nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00f3. \u2013 GV nh\u1eadn x\u00e9t c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS v\u00e0 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u nguy\u00ean nh\u00e2n g\u00e2y h\u1ecfng th\u1ef1c ph\u1ea9m * M\u1ee5c ti\u00eau: HS nh\u00e2\u0323n bi\u00ea\u0301t \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 nguy\u00ean nh\u00e2n g\u00e2y h\u1ecfng th\u1ef1c ph\u1ea9m, t\u1eeb \u0111\u00f3 bi\u1ebft c\u00e1ch v\u1eadn d\u1ee5ng b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, sau \u0111\u00f3 h\u01b0\u1edbng d\u1eabn HS \u0111\u1ecdc v\u00e0 quan s\u00e1t ba th\u00ed nghi\u1ec7m \u1edf ba \u0111i\u1ec1u ki\u1ec7n kh\u00e1c nhau: \u0111i\u1ec1u ki\u1ec7n l\u1ea1nh, \u0111i\u1ec1u ki\u1ec7n \u1ea5m v\u00e0 \u1ea9m, \u0111i\u1ec1u ki\u1ec7n s\u1ea5y kh\u00f4 v\u00e0 l\u1ea1nh. GV y\u00eau c\u1ea7u HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi trong SGK trang 82. + Trong \u0111i\u1ec1u ki\u1ec7n n\u00e0o n\u1ea5m m\u1ed1c ph\u00e1t tri\u1ec3n m\u1ea1nh nh\u1ea5t? + Nh\u1eefng nguy\u00ean nh\u00e2n n\u00e0o g\u00e2y h\u1ecfng b\u00e1nh m\u00ec trong c\u00e1c th\u00ed nghi\u1ec7m n\u00e0y? + Theo em, khi s\u1eed d\u1ee5ng th\u1ef1c ph\u1ea9m ch\u00fang ta c\u1ea7n ch\u00fa \u00fd \u0111i\u1ec1u g\u00ec? \u2013 GV g\u1ee3i \u00fd, h\u01b0\u1edbng d\u1eabn HS quan s\u00e1t th\u00ed nghi\u1ec7m v\u00e0 ho\u00e0n th\u00e0nh b\u1ea3ng theo g\u1ee3i \u00fd sau: \u0110i\u1ec1u ki\u1ec7n th\u00ed M\u00f4 t\u1ea3 th\u00ed nghi\u1ec7m K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m Nh\u1eadn x\u00e9t nghi\u1ec7m Ng\u00e0y 1 Ng\u00e0y 3 Ng\u00e0y 8 N\u1ea5m m\u1ed1c ph\u00e1t tri\u1ec3n \u0110i\u1ec1u ki\u1ec7n l\u1ea1nh \u2013 B\u00e1nh m\u00ec m\u1edbi s\u1ea3n xu\u1ea5t. B\u00ecnh B\u00ecnh B\u1eaft \u0111\u1ea7u xu\u1ea5t \u2013 \u0110\u1ec3 trong t\u1ee7 l\u1ea1nh. th\u01b0\u1eddng th\u01b0\u1eddng hi\u1ec7n n\u1ea5m m\u1ed1c ch\u1eadm. N\u1ea5m m\u1ed1c \u0110i\u1ec1u ki\u1ec7n \u1ea5m v\u00e0 \u2013 B\u00e1nh m\u00ec m\u1edbi s\u1ea3n xu\u1ea5t. B\u00ecnh B\u1eaft \u0111\u1ea7u N\u1ea5m m\u1ed1c ph\u1ee7 ph\u00e1t tri\u1ec3n \u1ea9m \u2013 L\u00e0m \u1ea9m. th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n g\u1ea7n k\u00edn mi\u1ebfng nhanh nh\u1ea5t. n\u1ea5m m\u1ed1c b\u00e1nh m\u00ec N\u1ea5m m\u1ed1c \u2013 \u0110\u1ec3 trong ph\u00f2ng. ch\u01b0a ph\u00e1t tri\u1ec3n trong \u0110i\u1ec1u ki\u1ec7n s\u1ea5y \u2013 B\u00e1nh m\u00ec m\u1edbi s\u1ea3n xu\u1ea5t. B\u00ecnh B\u00ecnh B\u00ecnh th\u01b0\u1eddng kh\u00f4 v\u00e0 l\u1ea1nh \u2013 S\u1ea5y kh\u00f4 v\u00e0 \u0111\u1ec3 trong th\u01b0\u1eddng th\u01b0\u1eddng v\u00f2ng t\u1ee7 l\u1ea1nh. 8 ng\u00e0y. 125","\u2013 GV m\u1eddi \u0111\u1ea1i di\u1ec7n c\u00e1c nh\u00f3m l\u00ean tr\u01b0\u1edbc l\u1edbp \u0111\u1ec3 tr\u00ecnh b\u00e0y b\u1ea3ng theo g\u1ee3i \u00fd tr\u00ean v\u00e0 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi trong SGK trang 82. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, \u0111\u01b0a ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u01a1\u0323i nho\u0301m c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi v\u00e0 tr\u00ecnh b\u00e0y b\u1ea3ng t\u1ed1t nh\u1ea5t, ch\u1ec9nh s\u1eeda v\u00e0 \u0111\u1ed9ng vi\u00ean c\u00e1c nh\u00f3m ch\u01b0a ho\u00e0n thi\u1ec7n. * K\u1ebft lu\u1eadn: Khi \u0111\u1ec3 \u1edf n\u01a1i n\u00f3ng \u1ea9m, th\u1ef1c ph\u1ea9m s\u1ebd nhanh b\u1ecb h\u1ecfng do nhi\u1ec5m n\u1ea5m m\u1ed1c. Ho\u1ea1t \u0111\u1ed9ng 2: T\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m * M\u1ee5c ti\u00eau: HS nh\u00e2\u0323n bi\u00ea\u0301t \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS th\u1ea3o lu\u1eadn theo nh\u00f3m \u0111\u00f4i, quan s\u00e1t c\u00e1c h\u00ecnh 8, 9, 10, 11, 12, 13 v\u00e0 c\u00e2u h\u1ecfi trong SGK trang 83. \u2013 HS l\u00e0m vi\u1ec7c c\u1eb7p \u0111\u00f4i, m\u1ed9t HS h\u1ecfi v\u00e0 m\u1ed9t HS k\u1ec3 t\u00ean c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m c\u00f3 trong c\u00e1c h\u00ecnh, t\u1eeb \u0111\u00f3 gi\u1ea3i th\u00edch t\u1ea1i sao nh\u1eefng th\u1ef1c ph\u1ea9m \u0111\u00f3 l\u1ea1i l\u00e2u h\u1ecfng. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS k\u1ec3 t\u00ean c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m v\u00e0 gi\u1ea3i th\u00edch tr\u01b0\u1edbc l\u1edbp. GV khuy\u1ebfn kh\u00edch HS k\u1ec3 th\u00eam m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m kh\u00e1c m\u00e0 HS bi\u1ebft ho\u1eb7c gia \u0111\u00ecnh th\u01b0\u1eddng \u00e1p d\u1ee5ng t\u1ea1i nh\u00e0. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, \u0111\u01b0a ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u01a1\u0323i nho\u0301m k\u1ec3 v\u00e0 ti\u0300m \u0111\u01b0\u01a1\u0323c nhi\u00ea\u0300u c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. * K\u1ebft lu\u1eadn: \u0110\u1ec3 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c l\u00e2u h\u01a1n, con ng\u01b0\u1eddi \u0111\u00e3 s\u1eed d\u1ee5ng nhi\u1ec1u c\u00e1ch nh\u01b0 b\u1ea3o qu\u1ea3n l\u1ea1nh, \u01b0\u1edbp mu\u1ed1i (mu\u1ed1i d\u01b0a), \u01b0\u1edbp \u0111\u01b0\u1eddng (l\u00e0m m\u1ee9t, si r\u00f4),\u2026 Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 t\u00ecm hi\u1ec3u th\u00eam m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m ph\u1ed5 bi\u1ebfn \u1edf gia \u0111\u00ecnh v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng. Ti\u1ebft 3 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho c\u00e1c nh\u00f3m thi t\u00ecm t\u1eeb li\u00ean quan \u0111\u1ebfn c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. V\u00ed d\u1ee5: mu\u1ed1i, s\u1ea5y kh\u00f4, \u01b0\u1edbp l\u1ea1nh,\u2026 Nh\u00f3m n\u00e0o t\u00ecm \u0111\u01b0\u1ee3c nhi\u1ec1u v\u00e0 nhanh nh\u1ea5t, nh\u00f3m \u0111\u00f3 th\u1eafng cu\u1ed9c. \u2013 GV nh\u1eadn x\u00e9t, b\u1ed5 sung th\u00eam c\u00e1c c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m va\u0300 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft 3 c\u1ee7a b\u00e0i h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: C\u00f9ng th\u1ea3o lu\u1eadn * M\u1ee5c ti\u00eau: Gi\u00fap HS c\u1ee7ng c\u1ed1 l\u1ea1i c\u00e1c c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m v\u00e0 li\u00ean h\u1ec7 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m t\u1ea1i gia \u0111\u00ecnh. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia nh\u00f3m v\u00e0 t\u1ed5 ch\u1ee9c h\u01b0\u1edbng d\u1eabn HS t\u1eebng nh\u00f3m quan s\u00e1t h\u00ecnh 13 v\u00e0 c\u00e2u h\u1ecfi trong SGK trang 83. 126","\u2013 GV t\u1ed5 ch\u1ee9c cho HS l\u00e0m vi\u1ec7c c\u1eb7p \u0111\u00f4i, t\u1eebng HS h\u1ecfi v\u00e0 k\u1ec3 t\u00ean m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m \u1edf gia \u0111\u00ecnh v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS k\u1ec3 t\u00ean c\u00e1c c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m tr\u01b0\u1edbc l\u1edbp. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, kh\u00e1i qu\u00e1t l\u1ea1i nh\u1eefng vi\u1ec7c c\u1ea7n l\u00e0m \u0111\u1ec3 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. \u2013 GV khen ng\u01a1\u0323i nho\u0301m k\u1ec3 \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m nh\u1ea5t. * K\u1ebft lu\u1eadn: \u0110\u1ec3 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m, con ng\u01b0\u1eddi \u0111\u00e3 s\u1eed d\u1ee5ng nhi\u1ec1u c\u00e1ch nh\u01b0 b\u1ea3o qu\u1ea3n l\u1ea1nh; h\u00fat ch\u00e2n kh\u00f4ng; \u01b0\u1edbp mu\u1ed1i (mu\u1ed1i d\u01b0a,\u2026), \u01b0\u1edbp \u0111\u01b0\u1eddng (l\u00e0m m\u1ee9t, si r\u00f4,\u2026); \u0111\u00f3ng h\u1ed9p; hun kh\u00f3i; ph\u01a1i, s\u1ea5y kh\u00f4;\u2026 Ho\u1ea1t \u0111\u1ed9ng 2: Tr\u00f2 ch\u01a1i \u201cTh\u1ef1c ph\u1ea9m \u2013 B\u1ea3o qu\u1ea3n\u201d * M\u1ee5c ti\u00eau: Ki\u1ec3m tra, c\u1ee7ng c\u1ed1 v\u1ec1 vi\u1ec7c b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4. \u2013 GV ph\u00e1t c\u00e1c th\u1ebb t\u1eeb cho t\u1eebng nh\u00f3m, h\u01b0\u1edbng d\u1eabn HS ch\u01a1i tr\u00f2 ch\u01a1i: \u201cTh\u1ef1c ph\u1ea9m \u2013 B\u1ea3o qu\u1ea3n\u201d. Lu\u1eadt ch\u01a1i: M\u1ed9t HS gi\u01a1 th\u1ebb t\u1eeb c\u00f3 t\u00ean th\u1ef1c ph\u1ea9m, c\u00e1c HS c\u00f2n l\u1ea1i n\u00eau c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m \u0111\u00f3. B\u1ea1n n\u00e0o tr\u1ea3 l\u1eddi nhanh v\u00e0 \u0111\u00fang nhi\u1ec1u nh\u1ea5t s\u1ebd th\u1eafng cu\u1ed9c. V\u00ed d\u1ee5: M\u1ed9t HS gi\u01a1 th\u1ebb t\u1eeb \u201cTh\u1ecbt l\u1ee3n\u201d, HS kh\u00e1c tr\u1ea3 l\u1eddi: kho, r\u00e1n, g\u00e1c b\u1ebfp, l\u00e0m th\u1ecbt h\u1ed9p, \u0111\u00f4ng l\u1ea1nh,\u2026 \u2013 GV khuy\u1ebfn kh\u00edch HS t\u00ecm th\u00eam nhi\u1ec1u c\u00e1ch b\u1ea3o qu\u1ea3n hay ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 \u0111\u1ea1i di\u1ec7n c\u00e1c nh\u00f3m l\u00ean tr\u01b0\u1edbc l\u1edbp tr\u00ecnh b\u00e0y \u00fd ki\u1ebfn d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng nh\u01b0 g\u1ee3i \u00fd sau: T\u00ean th\u1ef1c ph\u1ea9m C\u00e1ch b\u1ea3o qu\u1ea3n Th\u1ecbt l\u1ee3n Kho, r\u00e1n, g\u00e1c b\u1ebfp, l\u00e0m th\u1ecbt h\u1ed9p, \u0111\u00f4ng l\u1ea1nh,\u2026 C\u00e1 Kho, r\u00e1n, ph\u01a1i\/s\u1ea5y kh\u00f4, l\u00e0m c\u00e1 h\u1ed9p, l\u00e0m ch\u1ea3, h\u00fat ch\u00e2n kh\u00f4ng, \u0111\u00f4ng l\u1ea1nh,\u2026 C\u00f9i d\u1eeba L\u00e0m m\u1ee9t, n\u01b0\u1edbc c\u1ed1t d\u1eeba, b\u00e1nh d\u1eeba,\u2026 \u2026\u2026 \u2013 GV c\u00f9ng HS nh\u1eadn x\u00e9t ph\u1ea7n tr\u00ecnh b\u00e0y c\u1ee7a c\u00e1c nh\u00f3m. GV khen ng\u1ee3i c\u00e1c nh\u00f3m ho\u00e0n th\u00e0nh t\u1ed1t, \u0111\u01b0a ra \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e1ch b\u1ea3o qu\u1ea3n cho c\u00e1c th\u1ef1c ph\u1ea9m. * K\u1ebft lu\u1eadn: C\u00f3 nhi\u1ec1u c\u00e1ch ch\u1ebf bi\u1ebfn, b\u1ea3o qu\u1ea3n gi\u00fap th\u1ef1c ph\u1ea9m gi\u1eef \u0111\u01b0\u1ee3c l\u00e2u v\u00e0 th\u00e0nh nhi\u1ec1u m\u00f3n \u0103n kh\u00e1c nhau. \u2013 GV g\u1ee3i \u00fd v\u00e0 d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c c\u00e1c t\u1eeb kho\u00e1 trong b\u00e0i: N\u1ea5m \u0111\u1ed9c \u2013 N\u1ea5m m\u1ed1c \u2013 B\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV h\u01b0\u1edbng d\u1eabn HS v\u1ec1 nh\u00e0 ho\u00e0n th\u00e0nh b\u1ea3ng \u201cTh\u1ef1c ph\u1ea9m \u2013 B\u1ea3o qu\u1ea3n\u201d v\u00e0o v\u1edf v\u00e0 v\u1ebd s\u01a1 \u0111\u1ed3 t\u01b0 duy nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c c\u1ee7a ch\u1ee7 \u0111\u1ec1 N\u1ea5m \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft h\u1ecdc t\u1edbi. 127","B\u00e0i 22. \u00d4N T\u1eacP CH\u1ee6 \u0110\u1ec0 N\u1ea4M (1 ti\u1ebft) I. Y\u00caU C\u1ea6U C\u1ea6N \u0110\u1ea0T Sau b\u00e0i h\u1ecdc, HS: C\u1ee7ng c\u1ed1 v\u00e0 \u0111\u00e1nh gi\u00e1 \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c, k\u0129 n\u0103ng c\u1ee7a ch\u1ee7 \u0111\u1ec1 N\u1ea5m. II. \u0110\u1ed2 D\u00d9NG d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 22 SGK v\u00e0 c\u00e1c b\u00e0i thu\u1ed9c ch\u1ee7 \u0111\u1ec1 N\u1ea5m. \u2013 HS: SGK, VBT, c\u00e1c h\u00ecnh n\u1ea5m thu\u1ed9c ch\u1ee7 \u0111\u1ec1 N\u1ea5m. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i \u0111\u1ec3 h\u1ecdc sinh nh\u1edb l\u1ea1i nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc c\u1ee7a ch\u1ee7 \u0111\u1ec1 N\u1ea5m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS thi t\u00ecm nh\u1eefng c\u00e2u h\u00e1t, c\u00e2u th\u01a1 ho\u1eb7c c\u00e2u chuy\u1ec7n,\u2026 vi\u1ebft v\u1ec1 c\u00e1c lo\u1ea1i n\u1ea5m qua s\u00e1ch, truy\u1ec7n ho\u1eb7c in-t\u01a1-n\u00e9t,... V\u00ed d\u1ee5: B\u00e0i th\u01a1 \u201cC\u00e2y n\u1ea5m \u0111i m\u01b0a\u201d, c\u00e2u chuy\u1ec7n \u201cChuy\u1ec7n nh\u1eefng c\u00e2y n\u1ea5m\u201d,\u2026 \u2013 GV khuy\u1ebfn kh\u00edch HS khai th\u00e1c, ph\u00e2n t\u00edch v\u00e0 t\u00ecm m\u1ed9t s\u1ed1 c\u00e2u, t\u1eeb \u0111\u1ec3 di\u1ec5n t\u1ea3 h\u00ecnh d\u1ea1ng v\u00e0 n\u01a1i s\u1ed1ng c\u1ee7a n\u1ea5m. \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201c\u00d4n t\u1eadp ch\u1ee7 \u0111\u1ec1 N\u1ea5m\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: C\u00f9ng l\u00e0m b\u1ed9 s\u01b0u t\u1eadp * M\u1ee5c ti\u00eau: HS c\u1ee7ng c\u1ed1, \u00f4n t\u1eadp ki\u1ebfn th\u1ee9c v\u1ec1 ch\u1ee7 \u0111\u1ec1 N\u1ea5m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4 v\u00e0 y\u00eau c\u1ea7u HS c\u00f9ng l\u00e0m b\u1ed9 s\u01b0u t\u1eadp v\u1ec1 n\u1ea5m \u0103n theo g\u1ee3i \u00fd (SGK, trang 85). \u2013 GV h\u01b0\u1edbng d\u1eabn HS v\u1ebd ho\u1eb7c d\u00e1n h\u00ecnh \u1ea3nh c\u00e1c lo\u1ea1i n\u1ea5m m\u00e0 HS \u0111\u00e3 s\u01b0u t\u1ea7m \u0111\u01b0\u1ee3c. \u2013 GV m\u1eddi \u0111\u1ea1i di\u1ec7n c\u00e1c nh\u00f3m chia s\u1ebb s\u1ea3n ph\u1ea9m tr\u01b0\u1edbc l\u1edbp. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u1ee3i c\u00e1c nh\u00f3m s\u01b0u t\u1ea7m ho\u1eb7c v\u1ebd, vi\u1ebft \u0111\u01b0\u1ee3c t\u00ean nhi\u1ec1u lo\u1ea1i n\u1ea5m. * K\u1ebft lu\u1eadn: C\u00f9ng chia s\u1ebb v\u1edbi c\u00e1c b\u1ea1n, gia \u0111\u00ecnh v\u1ec1 n\u1ea5m \u0103n v\u00e0 c\u00e1c n\u1ea5m kh\u00e1c. Ho\u1ea1t \u0111\u1ed9ng 2: C\u00f9ng th\u1ea3o lu\u1eadn * M\u1ee5c ti\u00eau: HS c\u1ee7ng c\u1ed1, \u00f4n t\u1eadp ki\u1ebfn th\u1ee9c v\u1ec1 n\u1ea5m c\u00f3 \u00edch, n\u1ea5m c\u00f3 h\u1ea1i v\u00e0 m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. 128","* C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV h\u01b0\u1edbng d\u1eabn HS \u0111\u1ecdc y\u00eau c\u1ea7u (SGK, trang 85) v\u00e0 th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u00f4i v\u1ec1 t\u00e1c h\u1ea1i c\u1ee7a m\u1ed9t s\u1ed1 n\u1ea5m \u0111\u1ed9c, n\u1ea5m m\u1ed1c; m\u1ed9t s\u1ed1 c\u00e1ch b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m ph\u00f2ng tr\u00e1nh n\u1ea5m m\u1ed1c. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 c\u1eb7p HS l\u00ean chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u1ee3i c\u00e1c nh\u00f3m HS c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi t\u1ed1t, l\u01b0u lo\u00e1t,\u2026 * K\u1ebft lu\u1eadn: C\u00f9ng chia s\u1ebb v\u1edbi c\u00e1c b\u1ea1n, gia \u0111\u00ecnh, c\u1ed9ng \u0111\u1ed3ng v\u1ec1 c\u00e1ch s\u1eed d\u1ee5ng n\u1ea5m, b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m an to\u00e0n \u0111\u1ec3 c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh. Ho\u1ea1t \u0111\u1ed9ng 3: X\u1eed l\u00ed t\u00ecnh hu\u1ed1ng * M\u1ee5c ti\u00eau: HS c\u1ee7ng c\u1ed1, c\u00f3 \u00fd th\u1ee9c kh\u00f4ng \u0103n n\u1ea5m l\u1ea1. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV h\u01b0\u1edbng d\u1eabn HS quan s\u00e1t h\u00ecnh 1 (SGK, trang 85). \u2013 GV t\u1ed5 ch\u1ee9c cho HS l\u00e0m vi\u1ec7c nh\u00f3m \u0111\u00f4i, \u0111\u00f3ng vai b\u1ea1n h\u1ecfi \u2013 b\u1ea1n tr\u1ea3 l\u1eddi \u0111\u1ec3 x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng trong h\u00ecnh 1. GV khuy\u1ebfn kh\u00edch HS t\u00ecm th\u00eam c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c \u0111\u1ec3 \u0111\u00f3ng vai v\u00e0 x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng \u0111\u01b0a ra. \u2013 GV khen ng\u1ee3i nh\u00f3m x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng s\u00e1ng t\u1ea1o v\u00e0 t\u00ecm th\u00eam \u0111\u01b0\u1ee3c c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c li\u00ean quan t\u1edbi ch\u1ee7 \u0111\u1ec1 N\u1ea5m \u0111\u00e3 h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS ho\u00e0n thi\u1ec7n b\u1ed9 s\u01b0u t\u1eadp n\u1ea5m \u0111\u1ec3 tr\u01b0ng b\u00e0y \u1edf g\u00f3c s\u00e1ng t\u1ea1o c\u1ee7a l\u1edbp. 129","Chu\u00fb \u00f1e\u00e0 5: CON NG\u00d6\u00d4\u00d8I VA\u00d8 S\u00d6\u00d9C KHOE\u00db B\u00e0i 23. C\u00c1C NH\u00d3M CH\u1ea4T DINH D\u01af\u1ee0NG C\u00d3 TRONG TH\u1ee8C \u0102N (2 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2013 K\u1ec3 \u0111\u01b0\u1ee3c t\u00ean c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n. \u2013 N\u00eau \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 23 SGK, phi\u1ebfu h\u1ecdc t\u1eadp, b\u1ed1n th\u00f9ng c\u00f3 nh\u00e3n: \u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng\u201d, \u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m\u201d, \u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o\u201d, \u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng\u201d v\u00e0 c\u00e1c th\u1ebb t\u1eeb c\u00f3 t\u00ean th\u1ee9c \u0103n nh\u01b0 g\u1ee3i \u00fd. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 m\u00f4\u0323t s\u00f4\u0301 nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n \u0111\u1ec3 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc m\u1edbi. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS \u0111\u1ecdc v\u00e0 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: H\u1eb1ng ng\u00e0y, em th\u01b0\u1eddng s\u1eed d\u1ee5ng nh\u1eefng th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng n\u00e0o? T\u1ea1i sao em l\u1ea1i c\u1ea7n nh\u1eefng th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng \u0111\u00f3? \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi. \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 gi\u1ea3i th\u00edch th\u00eam cho HS: C\u01a1 th\u1ec3 ch\u00fang ta r\u1ea5t c\u1ea7n th\u1ee9c \u0103n v\u00e0 \u0111\u1ed3 u\u1ed1ng \u0111\u1ec3 cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 ch\u1ea5t dinh d\u01b0\u1ee1ng cho c\u01a1 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng, l\u1edbn l\u00ean v\u00e0 kho\u1ebb m\u1ea1nh,\u2026 D\u1ef1a v\u00e0o c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n, ng\u01b0\u1eddi ta chia th\u1ee9c \u0103n th\u00e0nh c\u00e1c nh\u00f3m, m\u1ed7i nh\u00f3m c\u00f3 nh\u1eefng vai tr\u00f2 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3,\u2026 \u2013 GV d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cC\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n * M\u1ee5c ti\u00eau: HS k\u1ec3 t\u00ean \u0111\u01b0\u1ee3c c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh 1 (SGK, trang 87), th\u1ea3o lu\u1eadn c\u1eb7p \u0111\u00f4i \u0111\u1ec3 ho\u00e0n th\u00e0nh c\u00e1c nhi\u1ec7m v\u1ee5 sau: + K\u1ec3 t\u00ean nh\u1eefng th\u1ee9c \u0103n c\u00f3 trong \u0111\u0129a ph\u1edf. 130","+ Th\u1ee9c \u0103n trong \u0111\u0129a ph\u1edf g\u1ed3m c\u00f3 nh\u1eefng nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng n\u00e0o? G\u1ee3i \u00fd: Nh\u1eefng th\u1ee9c \u0103n trong \u0111\u0129a ph\u1edf g\u1ed3m: + B\u00e1nh ph\u1edf ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng. + Th\u1ecbt b\u00f2 ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m. + Th\u1ecbt m\u1ee1 ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o. + Rau c\u1ea3i, c\u00e0 r\u1ed1t, h\u00e0nh t\u00e2y ch\u1ee9a nhi\u1ec1u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV co\u0301 th\u00ea\u0309 cung c\u1ea5p th\u00eam th\u00f4ng tin m\u1edf r\u1ed9ng cho HS: Trong su\u1ed1t cu\u1ed9c \u0111\u1eddi c\u1ee7a m\u00ecnh, m\u1ed9t ng\u01b0\u1eddi tr\u01b0\u1edfng th\u00e0nh c\u00f3 tu\u1ed5i th\u1ecd trung b\u00ecnh s\u1ebd ti\u00eau th\u1ee5 kho\u1ea3ng 27 t\u1ea5n th\u1ee9c \u0103n, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a 6 con voi. Th\u1ee9c \u0103n ch\u1ee9a c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng \u0111\u1ec3 cung c\u1ea5p cho c\u01a1 th\u1ec3 l\u1edbn l\u00ean v\u00e0 kho\u1ebb m\u1ea1nh; cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng \u0111\u1ec3 c\u01a1 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng h\u1eb1ng ng\u00e0y. Ngo\u00e0i b\u1ed1n nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng (ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng), th\u1ee9c \u0103n c\u00f2n ch\u1ee9a ch\u1ea5t x\u01a1 v\u00e0 n\u01b0\u1edbc r\u1ea5t c\u1ea7n thi\u1ebft cho c\u01a1 th\u1ec3. \u2013 GV h\u01b0\u1edbng d\u1eabn HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: D\u1ef1a v\u00e0o c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n, ng\u01b0\u1eddi ta chia th\u1ee9c \u0103n th\u00e0nh c\u00e1c nh\u00f3m: nh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, nh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m, nh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o v\u00e0 nh\u00f3m ch\u1ee9a nhi\u1ec1u vi-ta-min, ch\u1ea5t kho\u00e1ng. * Th\u00f4ng tin d\u00e0nh cho GV: M\u1ed9t lo\u1ea1i th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t dinh d\u01b0\u1ee1ng kh\u00e1c nhau n\u00ean c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u1ebfp v\u00e0o nhi\u1ec1u nh\u00f3m th\u1ee9c \u0103n kh\u00e1c nhau. V\u00ed d\u1ee5: tr\u1ee9ng ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t kho\u00e1ng (can\u2013xi, ph\u1ed1t\u2013pho, s\u1eaft, k\u1ebdm, i\u2013\u1ed1t); l\u00f2ng \u0111\u1ecf tr\u1ee9ng ch\u1ee9a nhi\u1ec1u vi-ta-min A, B,\u2026 Ho\u1ea1t \u0111\u1ed9ng 2: T\u00ecm hi\u1ec3u v\u1ec1 vai tr\u00f2 c\u1ee7a c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 GV t\u00e1ch ra t\u1eebng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec3 khai th\u00e1c c\u00e1c n\u1ed9i dung theo t\u1eebng nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng. Ho\u1ea1t \u0111\u1ed9ng 2a: T\u00ecm hi\u1ec3u v\u1ec1 ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng v\u00e0 vai tr\u00f2 c\u1ee7a ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 * M\u1ee5c ti\u00eau: K\u1ec3 \u0111\u01b0\u1ee3c t\u00ean m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng v\u00e0 vai tr\u00f2 c\u1ee7a ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t va\u0300 \u0111o\u0323c ca\u0301c th\u00f4ng tin \u1edf c\u00e1c h\u00ecnh 2a, 2b, 2c, 2d (SGK, trang 88). \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m \u0111\u00f4i, y\u00eau c\u1ea7u m\u1ed7i nh\u00f3m th\u1ea3o lu\u1eadn v\u00e0 ho\u00e0n th\u00e0nh c\u00e1c nhi\u1ec7m v\u1ee5 sau: + K\u1ec3 t\u00ean c\u00e1c th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng c\u00f3 trong h\u00ecnh. + N\u00f3i v\u1ec1 vai tr\u00f2 c\u1ee7a ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. + K\u1ec3 th\u00eam m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng m\u00e0 c\u00e1c em bi\u1ebft ho\u1eb7c gia \u0111\u00ecnh c\u00e1c em th\u01b0\u1eddng s\u1eed d\u1ee5ng. 131","G\u1ee3i \u00fd: + Nh\u01b0\u0303ng th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng nh\u01b0: g\u1ea1o, ng\u00f4, b\u00e1nh m\u00ec, c\u00e1c lo\u1ea1i khoai, b\u00e1nh ph\u1edf,\u2026 + Ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng c\u00f3 vai tr\u00f2 cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng ch\u1ee7 y\u1ebfu cho c\u01a1 th\u1ec3. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t va\u0300 t\u00ecm \u0111\u01b0\u1ee3c th\u00eam nhi\u1ec1u t\u00ean th\u1ee9c \u0103n m\u1edbi,\u2026 GV b\u1ed5 sung n\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a HS ch\u01b0a ho\u00e0n ch\u1ec9nh. \u2013 GV h\u01b0\u1edbng d\u1eabn HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: Nh\u01b0\u0303ng th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng nh\u01b0: g\u1ea1o, ng\u00f4, c\u00e1c lo\u1ea1i khoai, b\u00e1nh ph\u1edf, b\u00e1nh m\u00ec,\u2026 Ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng c\u00f3 vai tr\u00f2 cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng ch\u1ee7 y\u1ebfu cho c\u01a1 th\u1ec3. Ho\u1ea1t \u0111\u1ed9ng 2b: T\u00ecm hi\u1ec3u v\u1ec1 ch\u1ea5t \u0111\u1ea1m v\u00e0 vai tr\u00f2 c\u1ee7a ch\u1ea5t \u0111\u1ea1m \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 * M\u1ee5c ti\u00eau: K\u1ec3 \u0111\u01b0\u1ee3c t\u00ean m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m v\u00e0 vai tr\u00f2 c\u1ee7a ch\u1ea5t \u0111\u1ea1m \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t va\u0300 \u0111o\u0323c ca\u0301c th\u00f4ng tin \u1edf c\u00e1c h\u00ecnh 3a, 3b, 3c, 3d, 3e, 3g, 3h, 3i (SGK, trang 88). \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m \u0111\u00f4i, y\u00eau c\u1ea7u m\u1ed7i nh\u00f3m th\u1ea3o lu\u1eadn v\u00e0 ho\u00e0n th\u00e0nh c\u00e1c nhi\u1ec7m v\u1ee5 sau: + K\u1ec3 t\u00ean c\u00e1c th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m c\u00f3 trong h\u00ecnh. + N\u00f3i v\u1ec1 vai tr\u00f2 c\u1ee7a ch\u1ea5t \u0111\u1ea1m \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. + K\u1ec3 th\u00eam m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m m\u00e0 em bi\u1ebft ho\u1eb7c gia \u0111\u00ecnh th\u01b0\u1eddng s\u1eed d\u1ee5ng. G\u1ee3i \u00fd: + Nh\u01b0\u0303ng th\u1ee9c \u0103n gi\u00e0u ch\u1ea5t \u0111\u1ea1m nh\u01b0: c\u00e1c lo\u1ea1i th\u1ecbt, c\u00e1, t\u00f4m, tr\u1ee9ng, s\u1eefa, \u0111\u1ed7, \u0111\u1eadu ph\u1ee5,\u2026 + Ch\u1ea5t \u0111\u1ea1m c\u00f3 vai tr\u00f2 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 nh\u01b0 gi\u00fap x\u00e2y d\u1ef1ng v\u00e0 \u0111\u1ed5i m\u1edbi c\u01a1 th\u1ec3, gi\u00fap c\u01a1 th\u1ec3 l\u1edbn l\u00ean (GV c\u00f3 th\u1ec3 cung c\u1ea5p th\u00eam th\u00f4ng tin: ch\u1ea5t \u0111\u1ea1m tham gia t\u1ea1o ra nh\u1eefng t\u1ebf b\u00e0o m\u1edbi gi\u00fap c\u01a1 th\u1ec3 l\u1edbn l\u00ean v\u00e0 thay th\u1ebf nh\u1eefng t\u1ebf b\u00e0o gi\u00e0 ch\u1ebft \u0111i trong qu\u00e1 tr\u00ecnh s\u1ed1ng c\u1ee7a con ng\u01b0\u1eddi). \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t va\u0300 k\u1ec3 th\u00eam nhi\u1ec1u t\u00ean th\u1ee9c \u0103n gi\u00e0u ch\u1ea5t \u0111\u1ea1m kh\u00e1c. \u2013 GV h\u01b0\u1edbng d\u1eabn HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: Nh\u01b0\u0303ng th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m nh\u01b0: c\u00e1c lo\u1ea1i th\u1ecbt, c\u00e1, t\u00f4m, tr\u1ee9ng, s\u1eefa, \u0111\u1ed7, \u0111\u1eadu ph\u1ee5,\u2026 Ch\u1ea5t \u0111\u1ea1m c\u00f3 vai tr\u00f2 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 nh\u01b0 gi\u00fap x\u00e2y d\u1ef1ng v\u00e0 \u0111\u1ed5i m\u1edbi c\u01a1 th\u1ec3, gi\u00fap c\u01a1 th\u1ec3 l\u1edbn l\u00ean. 132","* Th\u00f4ng tin d\u00e0nh cho GV: Ph\u00f4 mai l\u00e0 m\u1ed9t lo\u1ea1i th\u1ee9c \u0103n \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb s\u1eefa b\u00f2, ch\u1ee9a r\u1ea5t nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m. Ho\u1ea1t \u0111\u1ed9ng 2c: T\u00ecm hi\u1ec3u v\u1ec1 ch\u1ea5t b\u00e9o v\u00e0 vai tr\u00f2 c\u1ee7a ch\u1ea5t b\u00e9o \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 * M\u1ee5c ti\u00eau: K\u1ec3 \u0111\u01b0\u1ee3c t\u00ean m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o v\u00e0 vai tr\u00f2 c\u1ee7a ch\u1ea5t b\u00e9o \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t va\u0300 \u0111o\u0323c ca\u0301c th\u00f4ng tin \u1edf c\u00e1c h\u00ecnh 4a, 4b, 4c, 4d (SGK, trang 89). \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m \u0111\u00f4i, y\u00eau c\u1ea7u m\u1ed7i nh\u00f3m th\u1ea3o lu\u1eadn v\u00e0 ho\u00e0n th\u00e0nh c\u00e1c nhi\u1ec7m v\u1ee5 sau: + K\u1ec3 t\u00ean c\u00e1c th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o c\u00f3 ngu\u1ed3n g\u1ed1c th\u1ef1c v\u1eadt, ch\u1ea5t b\u00e9o c\u00f3 ngu\u1ed3n g\u1ed1c \u0111\u1ed9ng v\u1eadt c\u00f3 trong h\u00ecnh. + N\u00f3i v\u1ec1 vai tr\u00f2 c\u1ee7a ch\u1ea5t b\u00e9o \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. + K\u1ec3 th\u00eam m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o m\u00e0 em bi\u1ebft ho\u1eb7c gia \u0111\u00ecnh th\u01b0\u1eddng s\u1eed d\u1ee5ng. G\u1ee3i \u00fd: + Nh\u01b0\u0303ng th\u1ee9c \u0103n gi\u00e0u ch\u1ea5t b\u00e9o nh\u01b0: th\u1ecbt m\u1ee1, b\u01a1, d\u1ea7u \u0103n, d\u1eeba, l\u1ea1c, v\u1eebng,\u2026 + Ch\u1ea5t b\u00e9o c\u00f3 vai tr\u00f2 cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng, gi\u1eef \u1ea5m cho c\u01a1 th\u1ec3. Ngo\u00e0i ra, ch\u1ea5t b\u00e9o trong c\u01a1 th\u1ec3 c\u00f2n gi\u00fap h\u1ea5p th\u1ee5 c\u00e1c vi-ta-min tan trong d\u1ea7u nh\u01b0 vi-ta-min A, D, E, K. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t va\u0300 k\u1ec3 th\u00eam \u0111\u01b0\u1ee3c nhi\u1ec1u t\u00ean th\u1ee9c \u0103n gi\u00e0u ch\u1ea5t b\u00e9o. \u2013 GV h\u01b0\u1edbng d\u1eabn HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: Nh\u01b0\u0303ng th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o nh\u01b0: th\u1ecbt m\u1ee1, b\u01a1, d\u1ea7u \u0103n, d\u1eeba, l\u1ea1c, v\u1eebng,\u2026 Ch\u1ea5t b\u00e9o c\u00f3 vai tr\u00f2 cung c\u1ea5p v\u00e0 d\u1ef1 tr\u1eef n\u0103ng l\u01b0\u1ee3ng, gi\u1eef \u1ea5m cho c\u01a1 th\u1ec3. Ngo\u00e0i ra, ch\u1ea5t b\u00e9o trong c\u01a1 th\u1ec3 c\u00f2n gi\u00fap h\u1ea5p th\u1ee5 c\u00e1c vi-ta-min tan trong d\u1ea7u nh\u01b0 vi-ta-min A, D, E, K. * Th\u00f4ng tin d\u00e0nh cho GV: B\u01a1 \u0111\u1ed9ng v\u1eadt l\u00e0 th\u1ee9c \u0103n \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn t\u1eeb s\u1eefa b\u00f2 nh\u01b0ng ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 v\u1ebd, vi\u1ebft t\u00ean c\u00e1c th\u1ee9c \u0103n gi\u00e0u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, ch\u1ea5t \u0111\u1ea1m v\u00e0o v\u1edf. Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 \u00f4n l\u1ea1i c\u00e1c nh\u00f3m ch\u1ea5t \u0111\u00e3 h\u1ecdc \u1edf ti\u1ebft tr\u01b0\u1edbc \u0111\u1ec3 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc m\u1edbi. 133","* C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS thi \u0111ua tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: \u0110\u1ed1 em, trong th\u1ee9c \u0103n c\u00f3 ch\u1ee9a c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng n\u00e0o? \u2013 HS tr\u1ea3 l\u1eddi c\u00e1 nh\u00e2n. \u2013 GV nh\u1eadn x\u00e9t chung v\u00e0 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft 2 c\u1ee7a b\u00e0i h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 2d: T\u00ecm hi\u1ec3u v\u1ec1 vi-ta-min, ch\u1ea5t kho\u00e1ng v\u00e0 vai tr\u00f2 c\u1ee7a ch\u00fang \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 * M\u1ee5c ti\u00eau: K\u1ec3 \u0111\u01b0\u1ee3c t\u00ean m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng. N\u00eau \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t va\u0300 \u0111o\u0323c ca\u0301c th\u00f4ng tin \u1edf c\u00e1c h\u00ecnh 5a, 5b, 5c, 5d (SGK, trang 89). \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m \u0111\u00f4i, y\u00eau c\u1ea7u m\u1ed7i nh\u00f3m th\u1ea3o lu\u1eadn v\u00e0 ho\u00e0n th\u00e0nh c\u00e1c nhi\u1ec7m v\u1ee5 sau: + K\u1ec3 t\u00ean c\u00e1c th\u1ee9c \u0103n gi\u00e0u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng c\u00f3 trong h\u00ecnh. + N\u00f3i v\u1ec1 vai tr\u00f2 c\u1ee7a vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. + K\u1ec3 th\u00eam m\u1ed9t s\u1ed1 th\u1ee9c \u0103n gi\u00e0u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng m\u00e0 em bi\u1ebft ho\u1eb7c gia \u0111\u00ecnh th\u01b0\u1eddng s\u1eed d\u1ee5ng. G\u1ee3i \u00fd: + Nh\u01b0\u0303ng th\u1ee9c \u0103n gi\u00e0u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng nh\u01b0: hoa qu\u1ea3 t\u01b0\u01a1i, rau xanh, cua, s\u1eefa t\u01b0\u01a1i,\u2026 + Vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng c\u00f3 vai tr\u00f2 gi\u00fap c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh, ph\u00f2ng ch\u1ed1ng b\u1ec7nh t\u1eadt. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t va\u0300 k\u1ec3 \u0111\u01b0\u1ee3c th\u00eam nhi\u1ec1u t\u00ean th\u1ee9c \u0103n gi\u00e0u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng. \u2013 GV h\u01b0\u1edbng d\u1eabn HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: Vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng r\u1ea5t c\u1ea7n thi\u1ebft cho ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a c\u01a1 th\u1ec3, gi\u00fap c\u01a1 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t v\u00e0 kho\u1ebb m\u1ea1nh. * Th\u00f4ng tin d\u00e0nh cho GV: \u2013 Vi-ta-min A r\u1ea5t c\u1ea7n thi\u1ebft cho m\u1eaft. Nh\u1eefng th\u1ee9c \u0103n gi\u00e0u vi-ta-min A nh\u01b0 c\u00e0 r\u1ed1t, xo\u00e0i,\u2026 \u2013 Vi-ta-min C gi\u00fap t\u0103ng c\u01b0\u1eddng h\u1ec7 mi\u1ec5n d\u1ecbch, b\u1ea3o v\u1ec7 c\u01a1 th\u1ec3 ch\u1ed1ng l\u1ea1i b\u1ec7nh t\u1eadt. Nh\u1eefng th\u1ee9c \u0103n gi\u00e0u vi-ta-min C nh\u01b0 cam, kiwi,\u2026 \u2013 M\u1ed9t s\u1ed1 ch\u1ea5t kho\u00e1ng nh\u01b0 s\u1eaft, can\u2013xi tham gia v\u00e0o vi\u1ec7c x\u00e2y d\u1ef1ng c\u01a1 th\u1ec3, can\u2013xi gi\u00fap x\u01b0\u01a1ng v\u00e0 r\u0103ng ch\u1eafc kho\u1ebb. Nh\u1eefng th\u1ee9c \u0103n gi\u00e0u can\u2013xi nh\u01b0 s\u1eefa, rau xanh,\u2026 \u0110\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 134","ch\u1ea5t kho\u00e1ng kh\u00e1c, c\u01a1 th\u1ec3 ch\u1ec9 c\u1ea7n m\u1ed9t l\u01b0\u1ee3ng r\u1ea5t nh\u1ecf \u0111\u1ec3 t\u1ea1o ra men th\u00fac \u0111\u1ea9y v\u00e0 \u0111i\u1ec1u khi\u1ec3n ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng, tuy v\u1eady n\u1ebfu thi\u1ebfu c\u00e1c ch\u1ea5t kho\u00e1ng th\u00ec c\u01a1 th\u1ec3 s\u1ebd b\u1ecb b\u1ec7nh do c\u00e1c qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i ch\u1ea5t trong c\u01a1 th\u1ec3 b\u1ecb r\u1ed1i lo\u1ea1n,\u2026 \u2013 Ch\u1ea5t x\u01a1 kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng nh\u01b0ng c\u00f3 vai tr\u00f2 quan tr\u1ecdng trong \u0111i\u1ec1u tr\u1ecb v\u00e0 ph\u00f2ng ng\u1eeba nh\u1eefng c\u0103n b\u1ec7nh m\u00e3n t\u00ednh nh\u01b0 tim m\u1ea1ch, b\u00e9o ph\u00ec, ti\u1ec3u \u0111\u01b0\u1eddng, t\u00e1o b\u00f3n, ung th\u01b0,\u2026 Ho\u1ea1t \u0111\u1ed9ng 3: T\u00ecm c\u00e1c th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng * M\u1ee5c ti\u00eau: Ki\u1ec3m tra, c\u1ee7ng c\u1ed1 v\u00e0 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c nh\u00f3m th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng; ch\u1ea5t \u0111\u1ea1m; ch\u1ea5t b\u00e9o; vi-ta-min, ch\u1ea5t kho\u00e1ng v\u00e0 vai tr\u00f2 c\u1ee7a ch\u00fang \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, ph\u00e1t cho m\u1ed7i nh\u00f3m m\u1ed9t t\u1edd gi\u1ea5y A4 ho\u1eb7c A3 v\u00e0 y\u00eau c\u1ea7u HS v\u1ebd, vi\u1ebft t\u00ean c\u00e1c th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng; ch\u1ea5t \u0111\u1ea1m; ch\u1ea5t b\u00e9o; vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng theo t\u1eebng c\u1ed9t ho\u1eb7c theo s\u1ef1 s\u00e1ng t\u1ea1o c\u1ee7a t\u1eebng nh\u00f3m. \u2013 GV t\u1ed5 ch\u1ee9c thi \u0111ua gi\u1eefa c\u00e1c nh\u00f3m, nh\u00f3m n\u00e0o vi\u1ebft, v\u1ebd \u0111\u01b0\u1ee3c nhi\u1ec1u th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng; ch\u1ea5t \u0111\u1ea1m; ch\u1ea5t b\u00e9o; vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng nhanh nh\u1ea5t, \u0111\u00fang nh\u1ea5t l\u00e0 nh\u00f3m th\u1eafng cu\u1ed9c. \u2013 GV ch\u1ecdn 2 \u2013 3 nh\u00f3m c\u00f3 s\u1ea3n ph\u1ea9m t\u1ed1t nh\u1ea5t treo l\u00ean b\u1ea3ng, m\u1eddi \u0111\u1ea1i di\u1ec7n l\u00ean gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m c\u1ee7a nh\u00f3m m\u00ecnh. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS nh\u1eadn x\u00e9t. \u2013 GV v\u00e0 khen ng\u1ee3i c\u00e1c nh\u00f3m ho\u00e0n th\u00e0nh t\u1ed1t v\u00e0 h\u01b0\u1edbng d\u1eabn HS r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: C\u00f3 r\u1ea5t nhi\u1ec1u th\u1ee9c \u0103n gi\u00e0u c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng xung quanh ch\u00fang ta, ch\u00fang r\u1ea5t \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa. Ho\u1ea1t \u0111\u1ed9ng 4: S\u1eafp x\u1ebfp c\u00e1c th\u1ef1c ph\u1ea9m v\u00e0o c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng * M\u1ee5c ti\u00eau: Ki\u1ec3m tra, c\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c, nh\u1eadn bi\u1ebft c\u00e1c lo\u1ea1i th\u1ef1c ph\u1ea9m thu\u1ed9c b\u1ed1n nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 6. \u2013 GV chu\u1ea9n b\u1ecb b\u1ed1n th\u00f9ng c\u00f3 nh\u00e3n: \u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng\u201d, \u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m\u201d,\u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o\u201d,\u201cNh\u00f3m ch\u1ee9a nhi\u1ec1u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng\u201d v\u00e0 c\u00e1c th\u1ebb t\u1eeb c\u00f3 t\u00ean th\u1ee9c \u0103n nh\u01b0 g\u1ee3i \u00fd (SGK, trang 90). \u2013 GV t\u1ed5 ch\u1ee9c cho c\u00e1c nh\u00f3m HS thi \u0111ua s\u1eafp x\u1ebfp c\u00e1c th\u1ebb t\u1eeb c\u00f3 t\u00ean th\u1ee9c \u0103n v\u00e0o b\u1ed1n th\u00f9ng sao cho ph\u00f9 h\u1ee3p. B\u1ea1n th\u1ee9 nh\u1ea5t \u0111\u1eb7t t\u00ean th\u1ee9c \u0103n v\u00e0o th\u00f9ng xong v\u1ec1 ch\u1ed7 th\u00ec b\u1ea1n ti\u1ebfp theo trong nh\u00f3m m\u1edbi \u0111\u01b0\u1ee3c l\u00ean. C\u1ee9 l\u00e0m tu\u1ea7n t\u1ef1 nh\u01b0 v\u1eady cho \u0111\u1ebfn h\u1ebft th\u1ebb ch\u1eef. \u2013 Nh\u00f3m n\u00e0o l\u00e0m \u0111\u00fang v\u00e0 nhanh nh\u1ea5t s\u1ebd l\u00e0 nh\u00f3m th\u1eafng cu\u1ed9c. 135","\u2013 GV tuy\u00ean d\u01b0\u01a1ng nh\u00f3m th\u1eafng cu\u1ed9c v\u00e0 nh\u1eafc l\u1ea1i n\u1ed9i dung v\u1ec1 b\u1ed1n nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n \u0111\u1ed3ng th\u1eddi l\u1ed3ng gh\u00e9p gi\u00e1o d\u1ee5c HS c\u1ea7n \u0103n u\u1ed1ng \u0111\u1ee7 b\u1ed1n nh\u00f3m ch\u1ea5t \u0111\u1ec3 gi\u00fap c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh. * K\u1ebft lu\u1eadn: C\u1ea7n quan s\u00e1t v\u00e0 ph\u00e2n lo\u1ea1i c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n h\u1eb1ng ng\u00e0y, t\u1eeb \u0111\u00f3 c\u00f3 ch\u1ebf \u0111\u1ed9 \u0103n u\u1ed1ng khoa h\u1ecdc. \u2013 GV d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c c\u00e1c t\u1eeb kho\u00e1 trong b\u00e0i: \u201cC\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng \u2013 Ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng \u2013 Ch\u1ea5t b\u00e9o \u2013 Ch\u1ea5t \u0111\u1ea1m \u2013 Vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng\u201d. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 t\u00ecm c\u00e1c th\u1ee9c \u0103n trong c\u00e1c b\u1eefa \u0103n h\u1eb1ng ng\u00e0y, sau \u0111\u00f3 ghi nh\u1eadn t\u00ean m\u00f3n \u0103n v\u00e0 x\u1ebfp ch\u00fang v\u00e0o c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng \u0111\u00e3 h\u1ecdc. B\u00e0i 24. GI\u00c1 TR\u1eca DINH D\u01af\u1ee0NG C\u00d3 TRONG TH\u1ee8C \u0102N (1 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: N\u00eau \u0111\u01b0\u1ee3c v\u00ed d\u1ee5 v\u1ec1 c\u00e1c th\u1ee9c \u0103n kh\u00e1c nhau cung c\u1ea5p cho c\u01a1 th\u1ec3 c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng v\u00e0 n\u0103ng l\u01b0\u1ee3ng \u1edf m\u1ee9c \u0111\u1ed9 kh\u00e1c nhau. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 24 SGK, phi\u1ebfu h\u1ecdc t\u1eadp. \u2013 HS: SGK, VBT; nh\u00e3n h\u1ed9p, g\u00f3i th\u1ee9c \u0103n. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 th\u1ef1c \u0111\u01a1n b\u1eefa \u0103n s\u00e1ng h\u1eb1ng ng\u00e0y c\u1ee7a HS v\u00e0 nh\u1eafc nh\u1edf HS c\u1ea7n \u0103n s\u00e1ng,\u2026 * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS \u0111\u1ecdc c\u00e2u h\u1ecfi trong ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng (SGK, trang 91). \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: + B\u1eefa \u0103n s\u00e1ng h\u1eb1ng ng\u00e0y c\u1ee7a em th\u01b0\u1eddng c\u00f3 nh\u1eefng th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng n\u00e0o? + Th\u1ee9c \u0103n n\u00e0o gi\u00e0u n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t? (G\u1ee3i \u00fd: G\u1ea1o\/c\u01a1m l\u00e0 th\u1ee9c \u0103n gi\u00e0u n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t). + V\u00ec sao em l\u1ea1i ch\u1ecdn nh\u1eefng th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng \u0111\u00f3 cho b\u1eefa \u0103n s\u00e1ng c\u1ee7a m\u00ecnh? \u2013 GV m\u1eddi c\u00e1c HS kh\u00e1c nh\u1eadn x\u00e9t nh\u1eefng th\u1ee9c \u0103n v\u00e0 \u0111\u1ed3 u\u1ed1ng m\u00e0 b\u1ea1n v\u1eeba n\u00eau \u0111\u00e3 \u0111\u1ee7 c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng ch\u01b0a. 136","\u2013 GV gi\u1ea3i th\u00edch cho HS: B\u1eefa \u0103n s\u00e1ng r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi m\u1ed7i ch\u00fang ta, v\u00ec n\u00f3 cung c\u1ea5p ch\u1ea5t dinh d\u01b0\u1ee1ng v\u00e0 n\u0103ng l\u01b0\u1ee3ng cho c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh, \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u00e0 vui ch\u01a1i, l\u1edbn l\u00ean m\u1ed7i ng\u00e0y,\u2026 \u2013 GV d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cGi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u v\u1ec1 n\u0103ng l\u01b0\u1ee3ng c\u00f3 trong m\u1ed9t s\u1ed1 th\u1ee9c \u0103n * M\u1ee5c ti\u00eau: \u2013 N\u00eau \u0111\u01b0\u1ee3c n\u0103ng l\u01b0\u1ee3ng c\u00f3 trong m\u1ed9t s\u1ed1 th\u1ee9c \u0103n. \u2013 HS nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c th\u1ee9c \u0103n kh\u00e1c nhau c\u00f3 n\u0103ng l\u01b0\u1ee3ng kh\u00e1c nhau. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u HS \u0111\u1ecdc th\u00f4ng tin v\u00e0 quan sa\u0301t hi\u0300nh 1 (SGK, trang 91). \u2013 GV gi\u1edbi thi\u1ec7u v\u1edbi HS v\u1ec1 calo: Ca-lo (k\u00ed hi\u1ec7u cal) ho\u1eb7c ki-l\u00f4-ca-lo (k\u00ed hi\u1ec7u kcal) l\u00e0 \u0111\u01a1n v\u1ecb \u0111o n\u0103ng l\u01b0\u1ee3ng ch\u1ee9a trong th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng; 1 kcal = 1 000 cal. Tr\u1ebb em \u1edf \u0111\u1ed9 tu\u1ed5i ti\u1ec3u h\u1ecdc c\u1ea7n t\u1eeb 1 600 kcal \u0111\u1ebfn 2 200 kcal m\u1ed7i ng\u00e0y \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng v\u00e0 l\u1edbn l\u00ean. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS \u0111\u1ea1i di\u1ec7n c\u1ee7a nh\u00f3m \u0111\u1ee9ng l\u00ean tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: + N\u0103ng l\u01b0\u1ee3ng c\u00f3 trong 100 gam c\u01a1m t\u1ebb, tr\u1ee9ng g\u00e0 lu\u1ed9c, s\u1eefa t\u01b0\u01a1i, t\u00f4m h\u1ea5p, th\u1ecbt b\u00f2 h\u1ea5p, l\u1ea1c chi\u00ean mu\u1ed1i, b\u1eafp c\u1ea3i lu\u1ed9c, chu\u1ed1i ti\u00eau l\u00e0 bao nhi\u00eau? + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t? (G\u1ee3i \u00fd: C\u01a1m t\u1ebb l\u00e0 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t). + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a \u00edt n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t? (G\u1ee3i \u00fd: B\u1eafp c\u1ea3i lu\u1ed9c l\u00e0 th\u1ee9c \u0103n ch\u1ee9a \u00edt n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t). \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 GV m\u1eddi c\u00e1c HS kh\u00e1c nh\u1eadn x\u00e9t v\u00e0 b\u1ed5 sung c\u00e2u tr\u1ea3 l\u1eddi. \u2013 GV c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c cho c\u00e1c nh\u00f3m l\u00ean b\u1ea3ng vi\u1ebft t\u00ean th\u1ee9c \u0103n c\u00f3 trong h\u00ecnh 1 theo th\u1ee9 t\u1ef1 t\u1eeb th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t \u0111\u1ebfn th\u1ee9c \u0103n ch\u1ee9a \u00edt n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t (G\u1ee3i \u00fd: L\u1ea1c chi\u00ean mu\u1ed1i \u2013 C\u01a1m t\u1ebb \u2013 Tr\u1ee9ng g\u00e0 lu\u1ed9c \u2013 Th\u1ecbt b\u00f2 h\u1ea5p \u2013 Chu\u1ed1i ti\u00eau \u2013 T\u00f4m h\u1ea5p \u2013 S\u1eefa t\u01b0\u01a1i \u2013 B\u1eafp c\u1ea3i lu\u1ed9c). \u2013 GV nh\u1eadn x\u00e9t chung, khen ng\u1ee3i c\u00e1c nh\u00f3m c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang v\u00e0 nhanh nh\u1ea5t. \u2013 GV gi\u1ea3i th\u00edch cho HS: M\u1ed7i lo\u1ea1i th\u1ee9c \u0103n ch\u1ec9 cung c\u1ea5p m\u1ed9t n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t \u0111\u1ecbnh, do v\u1eady ch\u00fang ta c\u1ea7n \u0103n u\u1ed1ng nhi\u1ec1u lo\u1ea1i th\u1ee9c \u0103n kh\u00e1c nhau \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ee7 n\u0103ng l\u01b0\u1ee3ng cung c\u1ea5p cho c\u01a1 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng v\u00e0 l\u1edbn l\u00ean. * L\u01b0u \u00fd: \u0110\u1ed1i v\u1edbi b\u00e0i h\u1ecdc n\u00e0y HS t\u00edch h\u1ee3p m\u00f4n To\u00e1n, do v\u1eady c\u00f3 th\u1ec3 khai th\u00e1c ki\u1ebfn th\u1ee9c To\u00e1n c\u1ee7a HS, khuy\u1ebfn kh\u00edch c\u00e1c em so s\u00e1nh gi\u00e1 tr\u1ecb th\u1ee9c \u0103n t\u1eeb l\u1edbn nh\u1ea5t \u0111\u1ebfn nh\u1ecf nh\u1ea5t,\u2026 * K\u1ebft lu\u1eadn: M\u1ed7i lo\u1ea1i th\u1ee9c \u0103n ch\u1ec9 cung c\u1ea5p m\u1ed9t n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t \u0111\u1ecbnh. Ho\u1ea1t \u0111\u1ed9ng 2: K\u1ec3 t\u00ean nh\u1eefng th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng * M\u1ee5c ti\u00eau: Ki\u00ea\u0309m tra hi\u00ea\u0309u bi\u00ea\u0301t cu\u0309a HS v\u1ec1 nh\u1eefng th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng. 137","* C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS \u0111o\u0323c c\u00e2u h\u1ecfi trong SGK trang 91, th\u1ea3o lu\u1eadn nh\u00f3m v\u00e0 k\u1ec3 t\u00ean m\u1ed9t s\u1ed1 th\u1ee9c \u0103n ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng. G\u1ee3i \u00fd: c\u01a1m, b\u00e1nh m\u00ec, b\u00e1nh ng\u1ecdt, khoai, ng\u00f4, c\u00e1, th\u1ecbt,... \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, l\u01b0u loa\u0301t va\u0300 co\u0301 th\u00eam nh\u01b0\u0303ng y\u0301 m\u01a1\u0301i, sa\u0301ng ta\u0323o,... * K\u1ebft lu\u1eadn: Nh\u1eefng th\u1ee9c \u0103n gi\u00e0u n\u0103ng l\u01b0\u1ee3ng: C\u01a1m, b\u00e1nh m\u00ec, b\u00e1nh ng\u1ecdt, khoai, ng\u00f4, c\u00e1, th\u1ecbt,... Ho\u1ea1t \u0111\u1ed9ng 3: T\u00ecm hi\u1ec3u v\u1ec1 th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n * M\u1ee5c ti\u00eau: \u2013 N\u00eau \u0111\u01b0\u1ee3c th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng c\u00f3 trong m\u1ed9t s\u1ed1 th\u1ee9c \u0103n. \u2013 Nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c th\u1ee9c \u0103n kh\u00e1c nhau c\u00f3 c\u00e1c th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng kh\u00e1c nhau. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u HS quan sa\u0301t b\u1ea3ng Th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng c\u1ee7a m\u1ed9t s\u1ed1 th\u1ee9c \u0103n (Theo: Gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng 500 m\u00f3n \u0103n th\u00f4ng d\u1ee5ng \u2013 Vi\u1ec7n Dinh d\u01b0\u1ee1ng Qu\u1ed1c gia n\u0103m 2016) trong SGK trang 92. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS \u0111\u1ea1i di\u1ec7n c\u1ee7a nh\u00f3m tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: + Th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng c\u00f3 trong 100 g c\u01a1m t\u1ebb, tr\u1ee9ng g\u00e0 lu\u1ed9c, s\u1eefa t\u01b0\u01a1i, t\u00f4m h\u1ea5p, th\u1ecbt b\u00f2 h\u1ea5p, l\u1ea1c chi\u00ean mu\u1ed1i, b\u1eafp c\u1ea3i lu\u1ed9c, chu\u1ed1i ti\u00eau l\u00e0 bao nhi\u00eau? + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng nh\u1ea5t? (G\u1ee3i \u00fd: c\u01a1m t\u1ebb). + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m nh\u1ea5t? (G\u1ee3i \u00fd: l\u1ea1c chi\u00ean mu\u1ed1i v\u00e0 th\u1ecbt b\u00f2 h\u1ea5p). + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u ch\u1ea5t b\u00e9o nh\u1ea5t? (G\u1ee3i \u00fd: l\u1ea1c chi\u00ean mu\u1ed1i). + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u vi-ta-min C nh\u1ea5t? (G\u1ee3i \u00fd: b\u1eafp c\u1ea3i lu\u1ed9c). + Th\u1ee9c \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u ch\u1ea5t kho\u00e1ng (Can-xi) nh\u1ea5t? (G\u1ee3i \u00fd: s\u1eefa t\u01b0\u01a1i, t\u00f4m h\u1ea5p). \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 GV m\u1eddi c\u00e1c HS kh\u00e1c nh\u1eadn x\u00e9t v\u00e0 b\u1ed5 sung c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a b\u1ea1n. \u2013 GV nh\u1eadn x\u00e9t chung, khen ng\u1ee3i c\u00e1c nh\u00f3m c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang v\u00e0 nhanh nh\u1ea5t. \u2013 GV y\u00eau c\u1ea7u c\u00e1c nh\u00f3m HS \u0111\u1ecdc v\u00e0 th\u1ea3o lu\u1eadn theo c\u00e1c c\u00e2u h\u1ecfi g\u1ee3i \u00fd trong SGK trang 93: + Nh\u1eefng th\u1ee9c \u0103n n\u00e0o trong b\u1ea3ng \u1edf trang 92 ch\u1ee9a nhi\u1ec1u ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o, ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng? + Th\u1ee9c \u0103n n\u00e0o cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng? + Gia \u0111\u00ecnh em th\u01b0\u1eddng s\u1eed d\u1ee5ng nh\u1eefng th\u1ee9c \u0103n n\u00e0o? + Theo em, c\u00e1c th\u1ee9c \u0103n kh\u00e1c nhau c\u00f3 n\u0103ng l\u01b0\u1ee3ng v\u00e0 c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng gi\u1ed1ng nhau kh\u00f4ng? 138","\u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 GV m\u1eddi c\u00e1c HS kh\u00e1c nh\u1eadn x\u00e9t v\u00e0 b\u1ed5 sung c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a b\u1ea1n. * K\u1ebft lu\u1eadn: C\u00e1c th\u1ee9c \u0103n kh\u00e1c nhau cung c\u1ea5p cho c\u01a1 th\u1ec3 c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng v\u00e0 n\u0103ng l\u01b0\u1ee3ng kh\u00e1c nhau. C\u00e1c th\u1ee9c \u0103n kh\u00e1c nhau c\u00f3 gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng kh\u00e1c nhau. C\u00e1c th\u1ee9c \u0103n nh\u01b0 tr\u1ee9ng, s\u1eefa, rau, hoa qu\u1ea3 l\u00e0 nh\u1eefng th\u1ee9c \u0103n c\u00f3 h\u1ea7u h\u1ebft c\u00e1c th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng,\u2026 Ho\u1ea1t \u0111\u1ed9ng 4: \u0110\u1ed1 em * M\u1ee5c ti\u00eau: Ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 th\u1ee9c \u0103n gi\u00e0u n\u0103ng l\u01b0\u1ee3ng, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u HS ph\u00e2n t\u00edch c\u00e1c su\u1ea5t \u0103n \u0111\u1ec3 gi\u1ea3i th\u00edch su\u1ea5t \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng, su\u1ea5t \u0103n n\u00e0o ch\u1ee9a nhi\u1ec1u vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng. \u2013 GV m\u1eddi \u0111a\u0323i di\u00ea\u0323n 2 \u2013 3 nho\u0301m l\u00ean tr\u1ea3 l\u1eddi tr\u01b0\u1edbc l\u1edbp. \u2013 GV m\u01a1\u0300i ca\u0301c nho\u0301m kha\u0301c nh\u1eadn x\u00e9t. \u2013 GV khen ng\u01a1\u0323i HS c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi, gi\u1ea3i th\u00edch r\u00f5 r\u00e0ng, ch\u00ednh x\u00e1c. * K\u1ebft lu\u1eadn: C\u1ea7n l\u1ef1a ch\u1ecdn su\u1ea5t \u0103n \u0111a d\u1ea1ng, \u0111\u1ee7 n\u0103ng l\u01b0\u1ee3ng, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng. Ho\u1ea1t \u0111\u1ed9ng 5: Em t\u1eadp l\u00e0m nha\u0300 khoa ho\u0323c * M\u1ee5c ti\u00eau: HS c\u00f3 th\u00f3i quen quan t\u00e2m t\u1edbi th\u00e0nh ph\u1ea7n gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng c\u00f3 trong m\u1ed7i th\u1ee9c \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS \u0111\u1ecdc v\u00e0 chia s\u1ebb c\u00e1c nh\u00e3n h\u1ed9p, g\u00f3i th\u1ee9c \u0103n \u0111\u00e3 s\u01b0u t\u1ea7m v\u1edbi c\u00e1c b\u1ea1n trong nh\u00f3m. \u2013 GV y\u00eau c\u1ea7u HS th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u00f4i, l\u1ef1a ch\u1ecdn m\u1ed9t s\u1ed1 nh\u00e3n h\u1ed9p, g\u00f3i th\u1ee9c \u0103n v\u00e0 ghi th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng c\u00f3 trong 100 gam th\u1ee9c \u0103n v\u00e0o v\u1edf theo g\u1ee3i \u00fd trong SGK. \u2013 GV m\u1eddi \u0111a\u0323i di\u00ea\u0323n 2 \u2013 3 nho\u0301m l\u00ean tri\u0300nh ba\u0300y sa\u0309n ph\u00e2\u0309m cu\u0309a nho\u0301m tr\u01b0\u1edbc l\u1edbp. \u2013 GV m\u01a1\u0300i ca\u0301c nho\u0301m kha\u0301c nh\u1eadn x\u00e9t. * K\u1ebft lu\u1eadn: Khi \u0111i mua th\u1ef1c ph\u1ea9m ch\u00fang ta c\u1ea7n \u0111\u1ecdc k\u0129 th\u00e0nh ph\u1ea7n ch\u1ea5t dinh d\u01b0\u1ee1ng, n\u0103ng l\u01b0\u1ee3ng c\u00f3 trong th\u1ee9c \u0103n v\u00e0 c\u00e1c th\u00f4ng tin kh\u00e1c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o mua \u0111\u00fang lo\u1ea1i th\u1ef1c ph\u1ea9m c\u1ea7n d\u00f9ng, \u0111\u1ee7 ch\u1ea5t dinh d\u01b0\u1ee1ng,\u2026 \u2013 GV g\u1ee3i \u00fd v\u00e0 d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c c\u00e1c t\u1eeb kho\u00e1 trong b\u00e0i: Ch\u1ea5t dinh d\u01b0\u1ee1ng \u2013 N\u0103ng l\u01b0\u1ee3ng. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc \u2013 GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 v\u1ebd, vi\u1ebft m\u1ed9t nh\u00e3n th\u1ee9c \u0103n m\u00e0 HS th\u00edch v\u00e0 ghi t\u00ean th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng c\u1ee7a th\u1ee9c \u0103n \u0111\u00f3 v\u00e0o v\u1edf. \u2013 GV g\u1ee3i \u00fd HS suy ngh\u0129 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: C\u1ea7n \u0103n u\u1ed1ng nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ec3 c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh? v\u00e0 chu\u1ea9n b\u1ecb cho b\u00e0i h\u1ecdc sau. 139","B\u00e0i 25. \u0102N, U\u1ed0NG KHOA H\u1eccC \u0111\u1ec3 c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh (3 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2212 Tr\u00ecnh b\u00e0y \u0111\u01b0\u1ee3c s\u1ef1 c\u1ea7n thi\u1ebft ph\u1ea3i \u0103n ph\u1ed1i h\u1ee3p nhi\u1ec1u lo\u1ea1i th\u1ee9c \u0103n, \u0103n nhi\u1ec1u rau, hoa qu\u1ea3 v\u00e0 u\u1ed1ng \u0111\u1ee7 n\u01b0\u1edbc m\u1ed7i ng\u00e0y. \u2212 N\u00eau \u0111\u01b0\u1ee3c \u1edf m\u1ee9c \u0111\u1ed9 \u0111\u01a1n gi\u1ea3n v\u1ec1 ch\u1ebf \u0111\u1ed9 \u0103n u\u1ed1ng c\u00e2n b\u1eb1ng. \u2212 Nh\u1eadn x\u00e9t \u0111\u01b0\u1ee3c b\u1eefa \u0103n c\u00f3 c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh kh\u00f4ng d\u1ef1a v\u00e0o s\u01a1 \u0111\u1ed3 th\u00e1p dinh d\u01b0\u1ee1ng c\u1ee7a tr\u1ebb em v\u00e0 \u0111\u1ed1i chi\u1ebfu v\u1edbi th\u1ef1c t\u1ebf b\u1eefa \u0103n trong ng\u00e0y \u1edf nh\u00e0 ho\u1eb7c \u1edf tr\u01b0\u1eddng. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 25 SGK, phi\u1ebfu \u0111i\u1ec1u tra. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng ki\u1ebfn th\u1ee9c c\u00e1c em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c \u1edf b\u00e0i tr\u01b0\u1edbc v\u1ec1 c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng \u0111\u1ec3 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc m\u1edbi. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS \u0111\u1ecdc c\u00e2u h\u1ecfi trong SGK trang 94. \u2013 GV y\u00eau c\u1ea7u t\u1eebng c\u1eb7p HS k\u1ec3 t\u00ean c\u00e1c m\u00f3n \u0103n m\u00e0 gia \u0111\u00ecnh \u0103n trong v\u00e0i ng\u00e0y g\u1ea7n nh\u1ea5t v\u00e0 nh\u1eadn x\u00e9t v\u1ec1 c\u00e1c b\u1eefa \u0103n \u0111\u00f3 \u0111\u00e3 \u0111\u1ee7 c\u00e1c th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng v\u00e0 n\u0103ng l\u01b0\u1ee3ng ch\u01b0a. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS tr\u1ea3 l\u1eddi. \u2013 GV nh\u1eadn x\u00e9t chung, gi\u1ea3i th\u00edch cho HS: \u0102n u\u1ed1ng h\u1ee3p l\u00ed, c\u00e2n \u0111\u1ed1i gi\u1eefa c\u00e1c lo\u1ea1i th\u1ee9c \u0103n r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi s\u1ee9c kho\u1ebb c\u1ee7a m\u1ed7i ng\u01b0\u1eddi,\u2026 \u2013 GV d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201c\u0102n, u\u1ed1ng khoa h\u1ecdc \u0111\u1ec3 c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh\u201d. Ho\u1ea1t \u0111\u1ed9ng 1: Nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c v\u00ec sao c\u1ea7n \u0103n ph\u1ed1i h\u1ee3p nhi\u1ec1u lo\u1ea1i th\u1ee9c \u0103n * M\u1ee5c ti\u00eau: Tr\u00ecnh b\u00e0y \u0111\u01b0\u1ee3c s\u1ef1 c\u1ea7n thi\u1ebft ph\u1ea3i \u0103n ph\u1ed1i h\u1ee3p nhi\u1ec1u lo\u1ea1i th\u1ee9c \u0103n, \u0103n nhi\u1ec1u rau v\u00e0 hoa qu\u1ea3. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh, \u0111\u1ecdc c\u00e1c th\u00f4ng tin v\u1ec1 c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng: ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o, ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng trong SGK trang 94, 95 va\u0300 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: 140","+ Th\u1ee9c \u0103n n\u00e0o c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb \u0111\u1ed9ng v\u1eadt, th\u1ee9c \u0103n n\u00e0o c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb th\u1ef1c v\u1eadt? + Th\u1ee9c \u0103n ch\u1ee9a ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o t\u1eeb \u0111\u1ed9ng v\u1eadt c\u00f3 \u00edch l\u1ee3i g\u00ec? + Th\u1ee9c \u0103n ch\u1ee9a ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o t\u1eeb th\u1ef1c v\u1eadt c\u00f3 \u00edch l\u1ee3i g\u00ec? + \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu c\u01a1 th\u1ec3 thi\u1ebfu ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng, vi-ta-min v\u00e0 ch\u1ea5t kho\u00e1ng? + Theo em, c\u1ea7n \u0103n ph\u1ed1i h\u1ee3p c\u00e1c lo\u1ea1i th\u1ee9c \u0103n nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ec3 c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh? \u2013 GV m\u1eddi 2 \u2212 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. * K\u1ebft lu\u1eadn: M\u1ed7i lo\u1ea1i th\u1ee9c \u0103n ch\u1ec9 cung c\u1ea5p m\u1ed9t s\u1ed1 ch\u1ea5t dinh d\u01b0\u1ee1ng nh\u1ea5t \u0111\u1ecbnh \u1edf nh\u1eefng t\u1ec9 l\u1ec7 kh\u00e1c nhau. Kh\u00f4ng c\u00f3 lo\u1ea1i th\u1ee9c \u0103n n\u00e0o ch\u1ee9a \u0111\u1ee7 ch\u1ea5t dinh d\u01b0\u1ee1ng cho nhu c\u1ea7u c\u1ee7a c\u01a1 th\u1ec3. V\u00ec v\u1eady, ch\u00fang ta c\u1ea7n \u0103n ph\u1ed1i h\u1ee3p nhi\u1ec1u lo\u1ea1i th\u1ee9c \u0103n \u0111\u1ec3 cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng v\u00e0 n\u0103ng l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft cho ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a c\u01a1 th\u1ec3. * Th\u00f4ng tin d\u00e0nh cho GV: \u2212 Trong t\u1ed5ng s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ea1m c\u1ea7n \u0103n, n\u00ean \u0103n t\u1eeb 1 \u0111\u1ebfn 1 l\u01b0\u1ee3ng \u0111\u1ea1m \u0111\u1ed9ng v\u1eadt. N\u00ean \u0103n c\u00e1 3 2 nhi\u1ec1u h\u01a1n \u0103n th\u1ecbt v\u00ec ch\u1ea5t \u0111\u1ea1m t\u1eeb c\u00e1 d\u1ec5 ti\u00eau h\u01a1n ch\u1ea5t \u0111\u1ea1m t\u1eeb th\u1ecbt; t\u1ed1i thi\u1ec3u m\u1ed7i tu\u1ea7n n\u00ean \u0103n ba b\u1eefa c\u00e1. \u2212 Ch\u1ea5t \u0111\u1ea1m \u0103n v\u00e0o kh\u00f4ng th\u1ec3 d\u1ef1 tr\u1eef \u0111\u01b0\u1ee3c v\u00ec v\u1eady n\u1ebfu \u0103n qu\u00e1 nhi\u1ec1u th\u1ee9c \u0103n gi\u00e0u \u0111\u1ea1m, ch\u1ea5t \u0111\u1ea1m s\u1ebd chuy\u1ec3n th\u00e0nh \u0111\u01b0\u1eddng v\u00e0 \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng th\u00e0nh n\u0103ng l\u01b0\u1ee3ng. \u2212 C\u00e1c ch\u1ea5t b\u00e9o \u0111\u1ed9ng v\u1eadt nh\u01b0 m\u1ee1, b\u01a1 c\u00f3 nhi\u1ec1u acid b\u00e9o no. C\u00e1c ch\u1ea5t b\u00e9o th\u1ef1c v\u1eadt nh\u01b0 d\u1ea7u v\u1eebng, d\u1ea7u l\u1ea1c, d\u1ea7u \u0111\u1eadu n\u00e0nh c\u00f3 nhi\u1ec1u acid b\u00e9o kh\u00f4ng no. V\u00ec v\u1eady, s\u1eed d\u1ee5ng c\u1ea3 m\u1ee1 v\u00e0 d\u1ea7u \u0103n \u0111\u1ec3 kh\u1ea9u ph\u1ea7n \u0103n c\u00f3 c\u1ea3 acid b\u00e9o no v\u00e0 kh\u00f4ng no. Ngo\u00e0i th\u1ecbt m\u1ee1, trong c\u00e1c ph\u1ee7 t\u1ea1ng \u0111\u1ed9ng v\u1eadt c\u00f3 ch\u1ee9a nhi\u1ec1u ch\u1ea5t l\u00e0m t\u0103ng huy\u1ebft \u00e1p v\u00e0 c\u00e1c b\u1ec7nh tim m\u1ea1ch n\u00ean c\u1ea7n h\u1ea1n ch\u1ebf c\u00e1c lo\u1ea1i th\u1ee9c \u0103n n\u00e0y. Ho\u1ea1t \u0111\u1ed9ng 2: Trao \u0111\u00f4\u0309i, tha\u0309o lu\u00e2\u0323n * M\u1ee5c ti\u00eau: Ki\u00ea\u0309m tra hi\u00ea\u0309u bi\u00ea\u0301t cu\u0309a HS v\u1ec1 vi\u1ec7c ph\u1ed1i h\u1ee3p c\u00e1c lo\u1ea1i th\u1ee9c \u0103n trong b\u1eefa \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c nh\u00f3m \u0111\u00f4i v\u00e0 quan s\u00e1t c\u00e1c h\u00ecnh 1, 2, 3 (SGK, trang 95). \u2013 HS th\u1ea3o lu\u1eadn y\u00eau c\u1ea7u trong SGK: + H\u00e3y ch\u1ec9 ra c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng, n\u0103ng l\u01b0\u1ee3ng c\u00f3 trong m\u1ed7i su\u1ea5t \u0103n. + Em n\u00ean ch\u1ecdn su\u1ea5t \u0103n n\u00e0o? V\u00ec sao? G\u1ee3i \u00fd: Em n\u00ean ch\u1ecdn su\u1ea5t \u0103n \u1edf h\u00ecnh 3 v\u00ec \u0111\u00e2y l\u00e0 su\u1ea5t \u0103n ch\u1ee9a \u0111\u1ea7y \u0111\u1ee7 c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng nh\u1ea5t. \u2013 GV m\u1eddi m\u1ed9t s\u1ed1 HS l\u00ean tr\u1ea3 l\u1eddi v\u00e0 li\u00ean h\u1ec7 v\u1edbi b\u1eefa \u0103n h\u1eb1ng ng\u00e0y, khuy\u1ebfn kh\u00edch HS v\u1eadn d\u1ee5ng c\u00e1c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc \u0111\u1ec3 ph\u00e2n t\u00edch r\u00f5 th\u00e0nh ph\u1ea7n v\u00e0 vai tr\u00f2 c\u1ee7a t\u1eebng lo\u1ea1i th\u1ee9c \u0103n. \u2013 GV khen ng\u01a1\u0323i nh\u01b0\u0303ng HS co\u0301 c\u00e2u tra\u0309 l\u1eddi \u0111\u00fang. 141","\u2013 GV c\u00f9ng HS nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: M\u1ed7i su\u1ea5t \u0103n c\u1ea7n ph\u1ea3i c\u00f3 \u0111\u1ee7 c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng nh\u01b0 ch\u1ea5t \u0111\u1ea1m, ch\u1ea5t b\u00e9o t\u1eeb \u0111\u1ed9ng v\u1eadt v\u00e0 th\u1ef1c v\u1eadt; ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng; vi-ta-min; ch\u1ea5t kho\u00e1ng. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS \u0111i\u1ec1u tra v\u00e0 ghi ch\u00e9p v\u1ec1 b\u1eefa \u0103n trong ba ng\u00e0y \u1edf nh\u00e0 ho\u1eb7c \u1edf tr\u01b0\u1eddng \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft h\u1ecdc t\u1edbi. Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 ph\u1ed1i h\u1ee3p c\u00e1c lo\u1ea1i th\u1ee9c \u0103n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS d\u01b0\u1edbi h\u00ecnh th\u1ee9c tr\u00f2 ch\u01a1i \u201c\u0110i ch\u1ee3\u201d. + C\u00e1ch 1: GV c\u00f3 th\u1ec3 d\u00f9ng tranh v\u1ebd m\u1ed9t s\u1ed1 m\u00f3n \u0103n, \u0111\u1ed3 u\u1ed1ng ho\u1eb7c th\u1ef1c ph\u1ea9m t\u01b0\u01a1i s\u1ed1ng v\u00e0 t\u1ed5 ch\u1ee9c cho HS l\u1ef1a ch\u1ecdn c\u00e1c th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng trong tranh. + C\u00e1ch 2: GV d\u00f9ng c\u00e1c th\u1ebb t\u1eeb\/th\u1ebb h\u00ecnh \u1ea3nh t\u00ean c\u00e1c lo\u1ea1i th\u1ee9c \u0103n ho\u1eb7c c\u00e1c lo\u1ea1i \u0111\u1ed3 ch\u01a1i b\u1eb1ng nh\u1ef1a nh\u01b0 c\u00e1c lo\u1ea1i rau, qu\u1ea3, g\u00e0, v\u1ecbt,\u2026 GV t\u1ed5 ch\u1ee9c cho HS ch\u01a1i b\u00e1n h\u00e0ng,\u2026 + C\u00e1ch 3: GV cho HS thi k\u1ec3 ho\u1eb7c v\u1ebd, vi\u1ebft t\u00ean c\u00e1c th\u1ee9c \u0103n, \u0111\u1ed3 u\u1ed1ng h\u1eb1ng ng\u00e0y. \u2013 GV nh\u1eadn x\u00e9t, c\u00f3 h\u00ecnh th\u1ee9c khen ng\u1ee3i, \u0111\u1ed9ng vi\u00ean va\u0300 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft 2 c\u1ee7a b\u00e0i h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u v\u1ec1 vai tr\u00f2 c\u1ee7a n\u01b0\u1edbc \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 * M\u1ee5c ti\u00eau: HS nh\u00e2\u0323n bi\u00ea\u0301t \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a n\u01b0\u1edbc \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 va\u0300 co\u0301 y\u0301 th\u01b0\u0301c u\u1ed1ng \u0111\u1ee7 n\u01b0\u1edbc m\u1ed7i ng\u00e0y. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m \u0111\u00f4i, y\u00eau c\u1ea7u HS \u0111\u1ecdc c\u00e1c th\u00f4ng tin v\u1ec1 vai tr\u00f2 c\u1ee7a n\u01b0\u1edbc \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 \u1edf trang 96 trong SGK. \u2013 GV h\u01b0\u1edbng d\u1eabn HS th\u1ea3o lu\u1eadn v\u00e0 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: + N\u01b0\u1edbc c\u00f3 vai tr\u00f2 nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3? + \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu ch\u00fang ta u\u1ed1ng kh\u00f4ng \u0111\u1ee7 n\u01b0\u1edbc? \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t v\u00e0 \u0111\u01b0a ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u01a1\u0323i HS c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang, l\u01b0u lo\u00e1t. * K\u1ebft lu\u1eadn: N\u01b0\u1edbc c\u00f3 vai tr\u00f2 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 nh\u01b0 \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 cho c\u01a1 th\u1ec3, gi\u00fap b\u00e0i ti\u1ebft ch\u1ea5t th\u1ea3i, v\u1eadn chuy\u1ec3n ch\u1ea5t dinh d\u01b0\u1ee1ng v\u00e0 \u00f4-xi \u0111\u1ebfn c\u00e1c c\u01a1 quan trong c\u01a1 th\u1ec3,\u2026 Ch\u00fang ta n\u00ean u\u1ed1ng \u0111\u1ee7 n\u01b0\u1edbc m\u1ed7i ng\u00e0y \u0111\u1ec3 b\u1ed5 sung l\u01b0\u1ee3ng n\u01b0\u1edbc \u0111\u00e3 m\u1ea5t \u0111i qua c\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u01a1 th\u1ec3. 142","* Th\u00f4ng tin d\u00e0nh cho GV: N\u01b0\u1edbc trong c\u01a1 th\u1ec3 c\u00f2n\u00a0gi\u00fap b\u00f4i tr\u01a1n v\u00e0 n\u00e2ng \u0111\u1ee1 c\u00e1c kh\u1edbp, tu\u1ef7 s\u1ed1ng,... l\u00e0 th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a n\u01b0\u1edbc b\u1ecdt.\u00a0N\u01b0\u1edbc b\u1ecdt\u00a0r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ec3 ph\u00e1 v\u1ee1 th\u1ee9c \u0103n r\u1eafn v\u00e0 gi\u1eef cho khoang mi\u1ec7ng kho\u1ebb m\u1ea1nh. Ngo\u00e0i ra, n\u01b0\u1edbc\u00a0\u0111\u1ec3 h\u00ecnh th\u00e0nh ph\u00e2n v\u00e0 tr\u00e1nh\u00a0t\u00e1o b\u00f3n. M\u1ed7i ng\u00e0y, n\u01b0\u1edbc \u0111\u01b0\u1ee3c c\u01a1 th\u1ec3 th\u1ea3i ra ngo\u00e0i qua \u0111\u01b0\u1eddng ti\u1ec3u kho\u1ea3ng 1 500 ml, qua m\u1ed3 h\u00f4i 600 ml, qua h\u01a1i th\u1edf 400 ml v\u00e0 qua ph\u00e2n l\u00e0 100 ml. Ho\u1ea1t \u0111\u1ed9ng 2: T\u00ecm hi\u1ec3u v\u1ec1 ch\u1ebf \u0111\u1ed9 \u0103n u\u1ed1ng c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh * M\u1ee5c ti\u00eau: N\u00eau \u0111\u01b0\u1ee3c \u1edf m\u1ee9c \u0111\u1ed9 \u0111\u01a1n gi\u1ea3n v\u1ec1 ch\u1ebf \u0111\u1ed9 \u0103n u\u1ed1ng c\u00e2n b\u1eb1ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 4, y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh Th\u00e1p dinh d\u01b0\u1ee1ng trong SGK trang 97 va\u0300 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: + Nh\u1eefng th\u1ef1c ph\u1ea9m n\u00e0o n\u00ean \u0103n \u00edt, \u0103n h\u1ea1n ch\u1ebf? + Nh\u1eefng th\u1ef1c ph\u1ea9m n\u00e0o c\u1ea7n \u0103n v\u1eeba ph\u1ea3i? + Nh\u1eefng th\u1ef1c ph\u1ea9m n\u00e0o c\u1ea7n \u0103n \u0111\u1ee7? \u2013 GV y\u00eau c\u1ea7u HS d\u1ef1a v\u00e0o th\u00e1p dinh d\u01b0\u1ee1ng, quan s\u00e1t h\u00ecnh 1, 2, 3 trang 95 v\u00e0 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi nh\u01b0 g\u1ee3i \u00fd: + Su\u1ea5t \u0103n n\u00e0o c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh? V\u00ec sao? + Em c\u1ea7n b\u1ed5 sung nh\u1eefng th\u1ee9c \u0103n n\u00e0o cho t\u1eebng su\u1ea5t \u0103n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh? \u2013 GV m\u01a1\u0300i m\u00f4\u0323t s\u00f4\u0301 HS tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi. \u2013 GV c\u00f9ng HS nh\u1eadn x\u00e9t v\u00e0 r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: \u2013 Trung b\u00ecnh m\u1ed7i ng\u00e0y m\u1ed9t tr\u1ebb em t\u1eeb 6 \u0111\u1ebfn 11 tu\u1ed5i c\u1ea7n: Ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng t\u1eeb 150 \u0111\u1ebfn 250 g; Rau t\u1eeb 150 \u0111\u1ebfn 250 g; Hoa qu\u1ea3 t\u01b0\u01a1i c\u1ea7n t\u1eeb 150 \u0111\u1ebfn 250 g; Ch\u1ea5t \u0111\u1ea1m c\u1ea7n t\u1eeb 150 \u0111\u1ebfn 250 g; Ch\u1ea5t b\u00e9o c\u1ea7n d\u01b0\u1edbi 15 g; N\u01b0\u1edbc c\u1ea7n t\u1eeb 1 300 ml \u0111\u1ebfn 1 500 ml. \u2013 \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh, l\u1edbn l\u00ean v\u00e0 ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng, ch\u00fang ta c\u1ea7n \u0103n u\u1ed1ng h\u1ee3p l\u00ed d\u1ef1a v\u00e0o th\u00e0nh ph\u1ea7n v\u00e0 gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng c\u1ee7a th\u1ee9c \u0103n. \u2013 \u0110\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t ch\u1ebf \u0111\u1ed9 \u0103n u\u1ed1ng c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh c\u1ea7n \u0111\u1ea3m b\u1ea3o c\u00e2n \u0111\u1ed1i th\u00e0nh ph\u1ea7n c\u00e1c nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng; \u0111\u1ee7 ch\u1ea5t, \u0111\u1ee7 l\u01b0\u1ee3ng; \u0103n \u0111\u1ee7 ch\u1ea5t b\u1ed9t \u0111\u01b0\u1eddng v\u00e0 hoa qu\u1ea3, rau xanh; \u0103n v\u1eeba ph\u1ea3i ch\u1ea5t \u0111\u1ea1m; \u0103n c\u00f3 m\u1ee9c \u0111\u1ed9 ch\u1ea5t b\u00e9o; \u0103n \u00edt \u0111\u1ed3 ng\u1ecdt v\u00e0 h\u1ea1n ch\u1ebf \u0103n m\u1eb7n. Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 \u0111i\u1ec1u tra b\u1eefa \u0103n trong ba ng\u00e0y \u1edf nh\u00e0 ho\u1eb7c \u1edf tr\u01b0\u1eddng \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft h\u1ecdc t\u1edbi. Ti\u1ebft 3 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 th\u00e1p dinh d\u01b0\u1ee1ng. 143","* C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV chia l\u1edbp th\u00e0nh c\u00e1c nh\u00f3m 6, y\u00eau c\u1ea7u m\u1ed7i nh\u00f3m \u0111\u01b0a ra \u00fd t\u01b0\u1edfng x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh Th\u00e1p dinh d\u01b0\u1ee1ng theo s\u1ef1 s\u00e1ng t\u1ea1o ri\u00eang c\u1ee7a nh\u00f3m m\u00ecnh. \u2013 Chia s\u1ebb \u00fd t\u01b0\u1edfng v\u1ec1 m\u00f4 h\u00ecnh Th\u00e1p dinh d\u01b0\u1ee1ng c\u1ee7a nh\u00f3m. Ho\u1ea1t \u0111\u1ed9ng 1: L\u00e0m m\u00f4 h\u00ecnh Th\u00e1p dinh d\u01b0\u1ee1ng * M\u1ee5c ti\u00eau: HS v\u1eadn d\u1ee5ng nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc v\u1ec1 \u0103n u\u1ed1ng c\u00e2n b\u1eb1ng v\u00e0 t\u00edch h\u1ee3p gi\u00e1o d\u1ee5c STEM. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS l\u00e0m vi\u1ec7c theo nh\u00f3m 6, m\u1ed7i nh\u00f3m ho\u00e0n th\u00e0nh m\u1ed9t m\u00f4 h\u00ecnh \u201cTh\u00e1p dinh d\u01b0\u1ee1ng\u201d theo h\u01b0\u1edbng d\u1eabn trong SGK trang 98. \u2013 GV quan s\u00e1t qu\u00e1 tr\u00ecnh c\u00e1c nh\u00f3m th\u1ef1c hi\u1ec7n v\u00e0 h\u1ed7 tr\u1ee3 khi c\u1ea7n thi\u1ebft. \u2013 GV m\u1eddi \u0111\u1ea1i di\u1ec7n m\u1ed9t s\u1ed1 nh\u00f3m l\u00ean gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m. \u2013 HS quan s\u00e1t v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. GV khen ng\u01a1\u0323i nho\u0301m HS co\u0301 s\u1ea3n ph\u1ea9m t\u00f4\u0301t, sa\u0301ng ta\u0323o. \u2013 GV v\u00e0 HS c\u00f9ng nhau nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: M\u00f4 h\u00ecnh Th\u00e1p dinh d\u01b0\u1ee1ng th\u1ec3 hi\u1ec7n \u0111\u00fang, \u0111\u1ee7, \u0111\u1ea1i di\u1ec7n b\u1ed1n nh\u00f3m ch\u1ea5t dinh d\u01b0\u1ee1ng. Ho\u1ea1t \u0111\u1ed9ng 2: Em t\u1eadp l\u00e0m nha\u0300 khoa ho\u0323c * M\u1ee5c ti\u00eau: HS b\u01b0\u01a1\u0301c \u0111\u00e2\u0300u t\u00e2\u0323p la\u0300m nghi\u00ean c\u01b0\u0301u khoa ho\u0323c qua vi\u00ea\u0323c \u0111i\u00ea\u0300u tra, kha\u0309o s\u00e1t v\u1ec1 b\u1eefa \u0103n \u1edf nh\u00e0 ho\u1eb7c \u1edf tr\u01b0\u1eddng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS \u0111o\u0323c phi\u00ea\u0301u \u0111i\u00ea\u0300u tra v\u1ec1 b\u1eefa \u0103n trong ba ng\u00e0y \u1edf nh\u00e0 ho\u1eb7c \u1edf tr\u01b0\u1eddng (SGK, trang 98). \u2013 GV y\u00eau c\u1ea7u HS th\u1ea3o lu\u1eadn nh\u00f3m 4 v\u00e0 hoa\u0300n tha\u0300nh phi\u00ea\u0301u \u0111i\u1ec1u tra tr\u00ean kh\u00f4\u0309 gi\u00e2\u0301y A4 ho\u0103\u0323c A3. \u2013 GV c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c cho HS \u0111\u00f3ng vai nh\u00e0 khoa h\u1ecdc\/nh\u00e0 dinh d\u01b0\u1ee1ng \u0111\u1ec3 nh\u1eadn x\u00e9t v\u1ec1 c\u00e1c b\u1eefa \u0103n \u0111\u00e3 c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh ch\u01b0a v\u00e0 \u0111\u1ec1 xu\u1ea5t cho t\u1eebng b\u1eefa \u0103n \u0111\u00f3. \u2013 GV m\u1eddi \u0111a\u0323i di\u00ea\u0323n 2 \u2013 3 nho\u0301m l\u00ean tri\u0300nh ba\u0300y sa\u0309n ph\u00e2\u0309m cu\u0309a nho\u0301m tr\u01b0\u1edbc l\u1edbp. \u2013 GV m\u01a1\u0300i HS ca\u0301c nho\u0301m kha\u0301c nh\u1eadn x\u00e9t. \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi cho HS: Em c\u1ea7n thay \u0111\u1ed5i \u0111i\u1ec1u g\u00ec v\u1ec1 th\u00f3i quen \u0103n u\u1ed1ng \u0111\u1ec3 c\u00e1c b\u1eefa \u0103n c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh v\u00e0 c\u00f3 l\u1ee3i cho s\u1ee9c kho\u1ebb? \u2013 GV khen ng\u01a1\u0323i nho\u0301m co\u0301 phi\u00ea\u0301u \u0111i\u00ea\u0300u tra chi\u0301nh xa\u0301c, chi ti\u00ea\u0301t va\u0300 co\u0301 gia\u0309i pha\u0301p sa\u0301ng ta\u0323o,... * K\u1ebft lu\u1eadn: C\u1ea7n ph\u1ed1i h\u1ee3p c\u00e1c lo\u1ea1i th\u1ee9c \u0103n \u0111\u1ea3m b\u1ea3o \u0111\u1ee7 ch\u1ea5t, \u0111\u1ee7 l\u01b0\u1ee3ng m\u1ed7i ng\u00e0y \u0111\u1ec3 c\u01a1 th\u1ec3 kho\u1ebb m\u1ea1nh. \u2013 GV g\u1ee3i \u00fd v\u00e0 d\u1eabn d\u1eaft \u0111\u1ec3 HS n\u00eau \u0111\u01b0\u1ee3c c\u00e1c t\u1eeb kho\u00e1 trong b\u00e0i: \u0102n u\u1ed1ng c\u00e2n b\u1eb1ng, l\u00e0nh m\u1ea1nh \u2013 Th\u00e1p dinh d\u01b0\u1ee1ng. 144","Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc \u2013 GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 \u0103n u\u1ed1ng \u0111\u1ee7 ch\u1ea5t, \u0111\u1ee7 l\u01b0\u1ee3ng v\u00e0 v\u00e2\u0323n \u0111\u00f4\u0323ng ng\u01b0\u01a1\u0300i th\u00e2n, b\u1ea1n be\u0300 c\u00f9ng th\u1ef1c hi\u1ec7n. \u2013 GV khuy\u00ea\u0301n khi\u0301ch HS ve\u0303 tranh tuy\u00ean truy\u00ea\u0300n \u0103n u\u1ed1ng c\u00e2n b\u1eb1ng. B\u00e0i 26. th\u01b0\u0323c ph\u00e2\u0309m AN TOA\u0300N (2 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2212 Ne\u0302u \u0111u\u031b\u01a1\u0323c to\u0301m t\u0103\u0301t th\u00ea\u0301 na\u0300o la\u0300 th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n va\u0300 li\u0301 do c\u00e2\u0300n pha\u0309i s\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n. \u2212 Nh\u1ea1\u0302n bi\u00ea\u0301t \u0111u\u031b\u01a1\u0323c m\u1ecd\u0302t s\u00f4\u0301 d\u00e2\u0301u hi\u1eb9\u0302u th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n tho\u0302ng qua v\u1ea1\u0302t th\u1ea1\u0302t ho\u1ea1\u0306c tranh a\u0309nh, video clip. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 26 SGK, b\u1ea3ng theo d\u00f5i vi\u1ec7c s\u1eed d\u1ee5ng th\u1ef1c ph\u1ea9m an to\u00e0n, gi\u1ea5y A4, phi\u1ebfu \u0111i\u1ec1u tra th\u1ef1c ph\u1ea9m an to\u00e0n. \u2013 HS: SGK, VBT. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 m\u00f4\u0323t s\u00f4\u0301 th\u01b0\u0301c \u0103n kh\u00f4ng an toa\u0300n \u0111\u1ec3 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc m\u1edbi. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan sa\u0301t hi\u0300nh 1 (SGK, trang 99). \u2013 GV \u0111\u1eb7t c\u00e2u h\u1ecfi: Mi\u00ea\u0301ng ba\u0301nh mi\u0300 ba\u0323n Nam chu\u1ea9n b\u1ecb \u0103n co\u0301 gi\u0300 \u0111\u0103\u0323c bi\u00ea\u0323t? Theo em, \u0111i\u00ea\u0300u gi\u0300 c\u00f3 th\u1ec3 xa\u0309y ra v\u1edbi ba\u0323n Nam n\u1ebfu b\u1ea1n \u1ea5y \u0103n c\u00e1c l\u00e1t ba\u0301nh mi\u0300 n\u00e0y? \u2013 GV y\u00eau c\u1ea7u HS suy ngh\u0129 v\u00e0 \u0111\u01b0a ra ca\u0301c ti\u0300nh hu\u00f4\u0301ng c\u00f3 th\u1ec3 x\u1ea3y ra n\u00ea\u0301u ba\u0323n Nam \u0103n mi\u00ea\u0301ng ba\u0301nh mi\u0300 m\u00f4\u0301c. \u2013 GV m\u1eddi 2 \u2013 3 HS tr\u1ea3 l\u1eddi. \u2013 GV nh\u1eadn x\u00e9t chung, gi\u1ea3i th\u00edch cho HS: \u0102n ba\u0301nh mi\u0300 m\u00f4\u0301c co\u0301 th\u00ea\u0309 g\u00e2y ng\u00f4\u0323 \u0111\u00f4\u0323c, l\u00e2u nga\u0300y co\u0301 th\u00ea\u0309 d\u00e2\u0303n t\u01a1\u0301i nhi\u00ea\u0300u b\u00ea\u0323nh nguy hi\u00ea\u0309m nh\u01b0 ung th\u01b0,... \u2013 GV d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc: \u201cTh\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n\u201d. 145","Ho\u1ea1t \u0111\u1ed9ng 1: Nh\u1eadn bi\u1ebft th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n * M\u1ee5c ti\u00eau: HS n\u00eau \u0111\u01b0\u1ee3c t\u00f3m t\u1eaft th\u00ea\u0301 na\u0300o la\u0300 th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh 2, 3, 4, 5, 6, 7, 8, 9 va\u0300 tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi: + Th\u01b0\u0323c ph\u00e2\u0309m trong c\u00e1c hi\u0300nh d\u01b0\u1edbi \u0111\u00e2y co\u0301 an toa\u0300n kh\u00f4ng? Vi\u0300 sao? + Theo em, ch\u00fang ta nh\u1eadn bi\u1ebft th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n qua nh\u1eefng d\u1ea5u hi\u1ec7u n\u00e0o? G\u1ee3i \u00fd: + Hi\u0300nh 2: Th\u01b0\u0323c ph\u00e2\u0309m (rau qua\u0309) \u0111\u01b0\u01a1\u0323c tr\u00f4\u0300ng s\u1ea1ch, an toa\u0300n, kh\u00f4ng co\u0301 thu\u00f4\u0301c tr\u01b0\u0300 s\u00e2u,... + Hi\u0300nh 3: Th\u1ef1c ph\u1ea9m c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o qu\u1ea3n trong t\u1ee7 l\u1ea1nh. + Hi\u0300nh 4: \u0102n th\u01b0\u0301c \u0103n n\u00e2\u0301u chi\u0301n (th\u01b0\u0301c \u0103n \u0111\u01b0\u01a1\u0323c n\u00e2\u0301u chi\u0301n se\u0303 kh\u00f4ng bi\u0323 nhi\u00ea\u0303m khu\u00e2\u0309n). + Hi\u0300nh 5: Th\u01b0\u0323c ph\u00e2\u0309m co\u0301 ngu\u00f4\u0300n g\u00f4\u0301c, xu\u00e2\u0301t x\u01b0\u0301 theo ti\u00eau chu\u00e2\u0309n cu\u0309a B\u00f4\u0323 Y t\u00ea\u0301. + Hi\u0300nh 6: Th\u01b0\u0323c ph\u00e2\u0309m co\u0300n ha\u0323n s\u01b0\u0309 du\u0323ng. + Hi\u0300nh 7: Th\u01b0\u0323c ph\u00e2\u0309m t\u01b0\u01a1i, s\u1ea1ch, kh\u00f4ng b\u1ecb d\u1eadp n\u00e1t. + Hi\u0300nh 8: Th\u01b0\u0323c ph\u00e2\u0309m \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn kh\u00f4ng h\u1ee3p v\u1ec7 sinh, ru\u1ed3i b\u00e2u. + Hi\u0300nh 9: Th\u01b0\u0323c ph\u00e2\u0309m qu\u00e1 h\u1ea1n s\u1eed d\u1ee5ng, b\u1ecb n\u1ea5m m\u1ed1c. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb tr\u01b0\u1edbc l\u1edbp. \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. \u2013 GV co\u0301 th\u00ea\u0309 cho HS \u0111o\u0323c th\u00eam mu\u0323c Em \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c \u0111\u00ea\u0309 hi\u00ea\u0309u ro\u0303 kha\u0301i ni\u00ea\u0323m th\u01b0\u0323c ph\u00e2\u0309m an to\u00e0n. * K\u1ebft lu\u1eadn: Th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n \u0111\u01b0\u01a1\u0323c nu\u00f4i, tr\u00f4\u0300ng, ba\u0309o qua\u0309n va\u0300 ch\u00ea\u0301 bi\u00ea\u0301n h\u01a1\u0323p v\u00ea\u0323 sinh; kh\u00f4ng bi\u0323 nhi\u00ea\u0303m vi sinh v\u1eadt, nhi\u00ea\u0303m ho\u00e1 ch\u00e2\u0301t; kh\u00f4ng bi\u0323 \u00f4i, thiu, d\u1eadp n\u00e1t; kh\u00f4ng g\u00e2y ng\u00f4\u0323 \u0111\u00f4\u0323c ho\u0103\u0323c g\u00e2y ha\u0323i cho ng\u01b0\u01a1\u0300i s\u01b0\u0309 du\u0323ng. Ho\u1ea1t \u0111\u1ed9ng 2: L\u00e2\u0323p ba\u0309ng theo do\u0303i vi\u00ea\u0323c s\u01b0\u0309 du\u0323ng ca\u0301c loa\u0323i th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n cu\u0309a gia \u0111i\u0300nh trong m\u00f4\u0323t nga\u0300y * M\u1ee5c ti\u00eau: HS nh\u00e2\u0323n bi\u00ea\u0301t va\u0300 co\u0301 y\u0301 th\u01b0\u0301c theo do\u0303i vi\u1ec7c s\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n trong gia \u0111i\u0300nh va\u0300 trong cu\u00f4\u0323c s\u00f4\u0301ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV h\u01b0\u1edbng d\u1eabn HS l\u00e0m vi\u1ec7c c\u1eb7p \u0111\u00f4i, hoa\u0300n tha\u0300nh ba\u0309ng theo do\u0303i vi\u1ec7c s\u1eed d\u1ee5ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n (SGK, trang 100) va\u0300o v\u01a1\u0309 ho\u0103\u0323c gi\u00e2\u0301y A4 (GV co\u0301 th\u00ea\u0309 cho HS la\u0300m vi\u00ea\u0323c nho\u0301m tr\u00ean gi\u00e2\u0301y A3, tu\u1ef3 \u0111i\u00ea\u0300u ki\u00ea\u0323n sao cho phu\u0300 h\u01a1\u0323p). \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb ba\u0309ng theo do\u0303i vi\u1ec7c s\u1eed d\u1ee5ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n cu\u0309a nho\u0301m mi\u0300nh tr\u01b0\u1edbc l\u1edbp. \u2013 GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t v\u00e0 \u0111\u01b0a ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u01a1\u0323i nho\u0301m s\u1eed d\u1ee5ng nhi\u00ea\u0300u th\u01b0\u0323c ph\u00e2\u0309m an to\u00e0n v\u00e0 vi\u1ebft \u0111\u01b0\u1ee3c d\u00e2\u0301u hi\u00ea\u0323u nh\u1eadn bi\u1ebft. * K\u1ebft lu\u1eadn: C\u00e2\u0300n quan sa\u0301t, ki\u00ea\u0309m tra th\u01b0\u0323c ph\u00e2\u0309m tr\u01b0\u01a1\u0301c khi s\u01b0\u0309 du\u0323ng; tra\u0301nh \u0103n pha\u0309i th\u01b0\u0323c ph\u00e2\u0309m \u0111a\u0303 bi\u0323 \u00f4i thiu, kh\u00f4ng \u0111a\u0309m ba\u0309o an toa\u0300n. 146","Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 hoa\u0300n thi\u00ea\u0323n ba\u0309ng theo do\u0303i th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n va\u0300o v\u01a1\u0309 va\u0300 chu\u00e2\u0309n bi\u0323 ca\u0301c n\u00f4\u0323i dung trong phi\u00ea\u0301u \u0111i\u00ea\u0300u tra th\u01b0\u0323c ph\u00e2\u0309m an to\u00e0n (SGK, trang 102) \u0111\u1ec3 chu\u1ea9n b\u1ecb cho ti\u1ebft 2. Ti\u1ebft 2 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 th\u1ef1c ph\u1ea9m an toa\u0300n. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS d\u01b0\u1edbi h\u00ecnh th\u1ee9c tr\u00f2 ch\u01a1i \u201cNhi\u0300n ng\u01b0\u01a1\u0300i \u0111oa\u0301n b\u00ea\u0323nh\u201d. \u2013 GV ph\u1ed5 bi\u1ebfn lu\u1eadt ch\u01a1i: GV chia l\u1edbp th\u00e0nh b\u1ed1n \u0111\u1ed9i. GV s\u1ebd \u0111\u01b0a l\u1ea7n l\u01b0\u1ee3t c\u00e1c th\u1ebb t\u1eeb c\u00f3 ghi m\u1ed9t s\u1ed1 tri\u1ec7u ch\u1ee9ng khi \u0103n th\u1ef1c ph\u1ea9m kh\u00f4ng an to\u00e0n nh\u01b0 n\u00f4n, \u0111au bu\u0323ng,... GV m\u01a1\u0300i HS b\u1ea5t k\u00ec l\u00ean ch\u1ecdn th\u1ebb t\u1eeb v\u00e0 di\u00ea\u0303n ta\u0309 l\u1ea1i b\u1ec7nh \u0111\u01b0\u1ee3c ghi trong the\u0309. Nh\u00f3m n\u00e0o no\u0301i nhanh v\u00e0 \u0111\u00fang, nh\u00f3m \u0111\u00f3 s\u1ebd gi\u00e0nh \u0111\u01b0\u1ee3c \u0111i\u1ec3m. \u2013 GV nh\u1eadn x\u00e9t, khen nh\u00f3m c\u00f3 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng va\u0300 d\u1eabn d\u1eaft v\u00e0o ti\u1ebft 2 c\u1ee7a b\u00e0i h\u1ecdc. Ho\u1ea1t \u0111\u1ed9ng 1: T\u00ecm hi\u1ec3u v\u00ec sao c\u1ea7n s\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n * M\u1ee5c ti\u00eau: HS n\u00eau \u0111\u01b0\u1ee3c li\u0301 do c\u00e2\u0300n pha\u0309i s\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n th\u00f4ng qua ca\u0301c hi\u0300nh a\u0309nh va\u0300 hoa\u0323t \u0111\u00f4\u0323ng. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan s\u00e1t h\u00ecnh 10, 11, 12, 13 (SGK, trang 101) va\u0300 tra\u0309 l\u01a1\u0300i c\u00e2u ho\u0309i: Ch\u1ec9 ra nh\u1eefng d\u1ea5u hi\u1ec7u kh\u00f4ng an to\u00e0n c\u1ee7a th\u1ef1c ph\u1ea9m trong m\u1ed7i h\u00ecnh. \u0110i\u00ea\u0300u gi\u0300 c\u00f3 th\u1ec3 xa\u0309y ra n\u00ea\u0301u chu\u0301ng ta \u0103n pha\u0309i ca\u0301c th\u01b0\u0323c ph\u00e2\u0309m \u0111\u00f3? Vi\u0300 sao? G\u01a1\u0323i y\u0301: + Hi\u0300nh 10: D\u1ea5u hi\u1ec7u kh\u00f4ng an to\u00e0n l\u00e0 th\u1ef1c ph\u1ea9m b\u1ecb phun thu\u1ed1c tr\u1eeb s\u00e2u. N\u00ea\u0301u s\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m co\u0301 phun thu\u00f4\u0301c tr\u01b0\u0300 s\u00e2u kh\u00f4ng \u0111u\u0301ng quy \u0111i\u0323nh se\u0303 d\u00e2\u0303n t\u01a1\u0301i c\u01a1 th\u00ea\u0309 bi\u0323 nhi\u00ea\u0303m \u0111\u00f4\u0323c, n\u00f4n m\u01b0\u0309a va\u0300 l\u00e2u d\u00e2\u0300n c\u00f3 th\u1ec3 m\u1eafc nhi\u00ea\u0300u b\u00ea\u0323nh nguy hi\u00ea\u0309m nh\u01b0 ung th\u01b0,... + Hi\u0300nh 11: D\u1ea5u hi\u1ec7u kh\u00f4ng an to\u00e0n l\u00e0 th\u1ef1c ph\u1ea9m c\u00f3 s\u1eed d\u1ee5ng ph\u1ea9m m\u00e0u. S\u01b0\u0309 du\u0323ng ph\u00e2\u0309m ma\u0300u c\u00f4ng nghi\u00ea\u0323p \u0111\u00ea\u0309 ch\u00ea\u0301 bi\u00ea\u0301n th\u01b0\u0323c ph\u00e2\u0309m g\u00e2y ha\u0323i s\u01b0\u0301c kho\u1ebb con ng\u01b0\u01a1\u0300i va\u0300 g\u00e2y nhi\u00ea\u0300u b\u00ea\u0323nh nguy hi\u00ea\u0309m,... + Hi\u0300nh 12: D\u1ea5u hi\u1ec7u kh\u00f4ng an to\u00e0n l\u00e0 th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn kh\u00f4ng s\u1ea1ch s\u1ebd, g\u1ea7n n\u01a1i \u0111\u1ed5 r\u00e1c, c\u00f3 ru\u1ed3i b\u00e2u. N\u00e2\u0301u va\u0300 \u0103n \u01a1\u0309 n\u01a1i g\u00e2\u0300n ra\u0301c, ru\u00f4\u0300i, gia\u0301n,... c\u00f3 th\u1ec3 l\u00e0m cho th\u1ee9c \u0103n d\u00ea\u0303 bi\u0323 nhi\u00ea\u0303m khu\u00e2\u0309n, ng\u01b0\u1eddi \u0103n ph\u1ea3i co\u0301 th\u00ea\u0309 m\u1eafc b\u00ea\u0323nh ta\u0309, li\u0323, n\u00f4n m\u01b0\u0309a,... + Hi\u0300nh 13: D\u1ea5u hi\u1ec7u kh\u00f4ng an to\u00e0n l\u00e0 th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn tr\u00ean d\u1ee5ng c\u1ee5 b\u1ecb m\u1ed1c. Ch\u00ea\u0301 bi\u00ea\u0301n th\u01b0\u0323c ph\u00e2\u0309m tr\u00ean th\u01a1\u0301t m\u00f4\u0301c va\u0300 ca\u0301c \u0111\u00f4\u0300 du\u0300ng kh\u00f4ng h\u01a1\u0323p v\u00ea\u0323 sinh se\u0303 d\u00e2\u0303n \u0111\u00ea\u0301n ng\u00f4\u0323 \u0111\u00f4\u0323c, c\u00f3 th\u1ec3 m\u1eafc b\u00ea\u0323nh v\u1ec1 \u0111\u01b0\u01a1\u0300ng ti\u00eau ho\u00e1, n\u00ea\u0301u s\u01b0\u0309 du\u0323ng l\u00e2u nga\u0300y co\u0301 th\u00ea\u0309 d\u00e2\u0303n t\u01a1\u0301i nhi\u00ea\u0300u b\u00ea\u0323nh nguy hi\u00ea\u0309m nh\u01b0 ung th\u01b0,... \u2013 GV m\u01a1\u0300i \u0111a\u0323i di\u00ea\u0323n m\u00f4\u0323t s\u00f4\u0301 HS l\u00ean b\u1ea3ng tr\u00ecnh b\u00e0y d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft th\u1ef1c ph\u1ea9m kh\u00f4ng an to\u00e0n trong c\u00e1c h\u00ecnh. 147","\u2013 GV y\u00eau c\u1ea7u HS k\u1ec3 t\u00ean m\u1ed9t s\u1ed1 th\u1ef1c ph\u1ea9m kh\u00f4ng an to\u00e0n kh\u00e1c v\u00e0 n\u00eau t\u00e1c h\u1ea1i khi s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i th\u1ef1c ph\u1ea9m \u0111\u00f3. \u2013 GV m\u1eddi 2 \u2013 3 HS b\u1ea5t k\u00ec \u0111\u1ee9ng l\u00ean tr\u1ea3 l\u1eddi. GV v\u00e0 HS c\u00f9ng nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. \u2013 GV khen ng\u01a1\u0323i HS c\u00f3 c\u00e2u tra\u0309 l\u01a1\u0300i \u0111u\u0301ng, sa\u0301ng ta\u0323o. * K\u1ebft lu\u1eadn: S\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m kh\u00f4ng an to\u00e0n nh\u01b0 th\u1ef1c ph\u1ea9m ch\u1ee9a thu\u1ed1c tr\u1eeb s\u00e2u, ch\u1ea5t t\u1ea1o m\u00e0u,\u2026; ch\u00ea\u0301 bi\u00ea\u0301n \u1edf n\u01a1i kh\u00f4ng h\u01a1\u0323p v\u00ea\u0323 sinh c\u00f3 th\u1ec3 b\u1ecb \u0111au b\u1ee5ng, n\u00f4n, ti\u00eau ch\u1ea3y,\u2026; tr\u01b0\u01a1\u0300ng h\u01a1\u0323p n\u0103\u0323ng co\u0301 th\u00ea\u0309 d\u1eabn t\u1edbi t\u01b0\u0309 vong. Ho\u1ea1t \u0111\u1ed9ng 2: X\u01b0\u0309 li\u0301 ti\u0300nh hu\u00f4\u0301ng * M\u1ee5c ti\u00eau: HS nh\u1eadn bi\u1ebft nh\u1eefng vi\u1ec7c, tho\u0301i quen kh\u00f4ng n\u00ean l\u00e0m \u0111\u00ea\u0309 \u0111a\u0309m ba\u0309o an toa\u0300n th\u01b0\u0323c ph\u00e2\u0309m. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS quan s\u00e1t h\u00ecnh 14, 15 (SGK, trang 101), th\u1ea3o lu\u1eadn c\u1eb7p \u0111\u00f4i, \u0111\u00f3ng vai \u0111\u1ec3 x\u1eed l\u00ed c\u00e1c t\u00ecnh hu\u1ed1ng trong h\u00ecnh th\u00f4ng qua c\u00e2u h\u1ecfi g\u1ee3i \u00fd: + Em co\u0301 nh\u00e2\u0323n xe\u0301t gi\u0300 v\u00ea\u0300 vi\u00ea\u0323c la\u0300m cu\u0309a nh\u01b0\u0303ng ng\u01b0\u01a1\u0300i trong m\u00f4\u0303i ti\u0300nh hu\u00f4\u0301ng? + Chia se\u0309 v\u01a1\u0301i ba\u0323n nh\u01b0\u0303ng vi\u00ea\u0323c em v\u00e0 gia \u0111\u00ecnh \u0111a\u0303 l\u00e0m \u0111\u00ea\u0309 \u0111a\u0309m ba\u0309o s\u1eed d\u1ee5ng th\u01b0\u0323c ph\u00e2\u0309m an to\u00e0n. \u2013 GV m\u1eddi 2 \u2013 3 c\u1eb7p HS chia s\u1ebb ho\u0103\u0323c \u0111o\u0301ng vai ca\u0301c ti\u0300nh hu\u00f4\u0301ng nh\u01b0 hi\u0300nh 14, 15 tr\u01b0\u1edbc l\u1edbp. \u2013 GV c\u00f3 th\u1ec3 g\u1ee3i m\u1edf \u0111\u1ec3 HS n\u00eau th\u00eam nh\u1eefng vi\u1ec7c kh\u00f4ng n\u00ean l\u00e0m ho\u0103\u0323c n\u00ean la\u0300m \u0111\u00ea\u0309 \u0111a\u0309m ba\u0309o v\u00ea\u0323 sinh an toa\u0300n th\u01b0\u0323c ph\u00e2\u0309m \u01a1\u0309 nha\u0300 va\u0300 \u01a1\u0309 tr\u01b0\u01a1\u0300ng nh\u01b0: kh\u00f4ng mua qua\u0300 v\u0103\u0323t \u01a1\u0309 c\u00f4\u0309ng tr\u01b0\u01a1\u0300ng, kh\u00f4ng mua ke\u0323o ba\u0301nh co\u0301 ph\u00e2\u0309m ma\u0300u s\u0103\u0323c s\u01a1\u0303 kh\u00f4ng ro\u0303 ngu\u00f4\u0300n g\u00f4\u0301c,... \u2013 HS tr\u1ea3 l\u1eddi v\u00e0 nh\u1eadn x\u00e9t l\u1eabn nhau. GV khen ng\u01a1\u0323i nho\u0301m HS co\u0301 c\u00e2u tra\u0309 l\u01a1\u0300i t\u00f4\u0301t, sa\u0301ng ta\u0323o. \u2013 GV v\u00e0 HS c\u00f9ng nhau nh\u1eadn x\u00e9t, r\u00fat ra k\u1ebft lu\u1eadn. * K\u1ebft lu\u1eadn: Kh\u00f4ng \u0103n ti\u00ea\u0301t canh va\u0300 nh\u01b0\u0303ng th\u01b0\u0323c ph\u00e2\u0309m ch\u01b0a \u0111\u01b0\u01a1\u0323c n\u00e2\u0301u chi\u0301n; v\u00e2\u0323n \u0111\u00f4\u0323ng ng\u01b0\u01a1\u0300i th\u00e2n kh\u00f4ng s\u01b0\u0309 du\u0323ng ch\u00e2\u0301t ki\u0301ch thi\u0301ch (nh\u01b0 thu\u1ed1c t\u0103ng tr\u1ecdng) trong ch\u0103n nu\u00f4i,... Ho\u1ea1t \u0111\u1ed9ng 3: Em t\u1eadp l\u00e0m nha\u0300 khoa ho\u0323c * M\u1ee5c ti\u00eau: HS b\u01b0\u01a1\u0301c \u0111\u00e2\u0300u t\u00e2\u0323p la\u0300m nghi\u00ean c\u01b0\u0301u khoa ho\u0323c qua vi\u00ea\u0323c \u0111i\u00ea\u0300u tra, kha\u0309o sa\u0301t, nh\u00e2\u0323n bi\u00ea\u0301t s\u00e2u s\u0103\u0301c h\u01a1n v\u00ea\u0300 m\u00f4\u0323t s\u00f4\u0301 th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n, kh\u00f4ng an toa\u0300n va\u0300 \u0111\u01b0a ra \u0111\u01b0\u01a1\u0323c nguy\u00ean nh\u00e2n, gia\u0309i pha\u0301p. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV y\u00eau c\u1ea7u HS \u0111o\u0323c phi\u00ea\u0301u \u0111i\u00ea\u0300u tra th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n (SGK, trang 102) va\u0300 th\u1ea3o lu\u1eadn nh\u00f3m \u0111\u1ec3 hoa\u0300n tha\u0300nh phi\u00ea\u0301u. \u2013 GV y\u00eau c\u1ea7u HS th\u1ea3o lu\u1eadn nh\u00f3m 4 v\u00e0 hoa\u0300n tha\u0300nh phi\u00ea\u0301u tr\u00ean kh\u00f4\u0309 gi\u00e2\u0301y A4 ho\u0103\u0323c A3. \u2013 Tu\u1ef3 tr\u00ecnh \u0111\u1ed9 HS, GV c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c cho HS \u0111\u00f3ng vai x\u1eed l\u00ed t\u00ecnh hu\u1ed1ng. \u2013 GV m\u1eddi \u0111a\u0323i di\u00ea\u0323n 2 \u2013 3 nho\u0301m l\u00ean tri\u0300nh ba\u0300y sa\u0309n ph\u00e2\u0309m cu\u0309a nho\u0301m tr\u01b0\u1edbc l\u1edbp. 148","\u2013 GV m\u01a1\u0300i HS ca\u0301c nho\u0301m kha\u0301c nh\u1eadn x\u00e9t. \u2013 GV khen ng\u01a1\u0323i nho\u0301m co\u0301 phi\u00ea\u0301u \u0111i\u00ea\u0300u tra chi\u0301nh xa\u0301c, chi ti\u00ea\u0301t va\u0300 co\u0301 gia\u0309i pha\u0301p sa\u0301ng ta\u0323o,... \u2013 GV co\u0301 th\u00ea\u0309 cho HS \u0111o\u0323c th\u00eam mu\u0323c Em t\u00ecm hi\u1ec3u th\u00eam \u01a1\u0309 l\u01a1\u0301p (n\u00ea\u0301u co\u0300n th\u01a1\u0300i gian) ho\u0103\u0323c v\u00ea\u0300 nha\u0300, \u0111\u00ea\u0309 HS hi\u00ea\u0309u th\u00eam v\u1ec1 th\u01b0\u0323c tra\u0323ng cu\u0309a th\u01b0\u0323c ph\u00e2\u0309m kh\u00f4ng \u0111\u1ea3m b\u1ea3o an toa\u0300n hi\u00ea\u0323n nay. * K\u1ebft lu\u1eadn: \u0110\u00ea\u0309 \u0111a\u0309m ba\u0309o an toa\u0300n v\u00ea\u0323 sinh th\u01b0\u0323c ph\u00e2\u0309m chu\u0301ng ta c\u00e2\u0300n: nu\u00f4i tr\u00f4\u0300ng, ch\u00ea\u0301 bi\u00ea\u0301n, ba\u0309o qua\u0309n va\u0300 s\u01b0\u0309 du\u0323ng th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n; gi\u01b0\u0303 v\u00ea\u0323 sinh ca\u0301 nh\u00e2n va\u0300 khu v\u01b0\u0323c \u0103n u\u00f4\u0301ng, gi\u01b0\u0303 v\u00ea\u0323 sinh m\u00f4i tr\u01b0\u01a1\u0300ng xung quanh,... Ch\u00fang ta c\u1ea7n s\u1eed d\u1ee5ng th\u1ef1c ph\u1ea9m t\u01b0\u01a1i, s\u1ea1ch; kh\u00f4ng c\u00f3 m\u00e0u s\u1eafc v\u00e0 m\u00f9i v\u1ecb l\u1ea1; ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m b\u1eb1ng n\u01b0\u1edbc v\u00e0 d\u1ee5ng c\u1ee5 s\u1ea1ch; b\u1ea3o qu\u1ea3n h\u1ee3p v\u1ec7 sinh,\u2026 Ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp n\u1ed1i sau b\u00e0i h\u1ecdc \u2013 GV y\u00eau c\u1ea7u HS v\u1ec1 nh\u00e0 th\u1ef1c hi\u1ec7n nh\u1eefng vi\u00ea\u0323c la\u0300m \u0111a\u0309m ba\u0309o an toa\u0300n th\u01b0\u0323c ph\u00e2\u0309m, v\u00e2\u0323n \u0111\u00f4\u0323ng ng\u01b0\u01a1\u0300i th\u00e2n va\u0300 ba\u0323n be\u0300 co\u0301 y\u0301 th\u01b0\u0301c s\u01b0\u0309 du\u0323ng, ch\u00ea\u0301 bi\u00ea\u0301n th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n, \u0111a\u0309m ba\u0309o s\u01b0\u0301c kho\u1ebb cho ba\u0309n th\u00e2n, gia \u0111i\u0300nh va\u0300 c\u00f4\u0323ng \u0111\u00f4\u0300ng. \u2013 GV khuy\u00ea\u0301n khi\u0301ch HS ve\u0303 tranh tuy\u00ean truy\u00ea\u0300n v\u00ea\u0300 vi\u1ec7c s\u01b0\u0309 du\u0323ng va\u0300 sa\u0309n xu\u00e2\u0301t th\u01b0\u0323c ph\u00e2\u0309m an toa\u0300n \u0111\u00ea\u0309 tr\u01b0ng ba\u0300y \u01a1\u0309 g\u00f3c h\u1ecdc t\u1eadp c\u1ee7a l\u1edbp. B\u00e0i 27. M\u00d4\u0323T S\u00d4\u0301 B\u00ca\u0323NH LI\u00caN QUAN \u0110\u00ca\u0301N DINH D\u01af\u01a0\u0303NG (2 ti\u1ebft) I. Y\u00eau c\u1ea7u c\u1ea7n \u0111\u1ea1t Sau b\u00e0i h\u1ecdc, HS: \u2013 N\u00eau \u0111\u01b0\u1ee3c t\u00ean, d\u1ea5u hi\u1ec7u ch\u00ednh v\u00e0 nguy\u00ean nh\u00e2n c\u1ee7a m\u1ed9t s\u1ed1 b\u1ec7nh do thi\u1ebfu ho\u1eb7c th\u1eeba ch\u1ea5t dinh d\u01b0\u1ee1ng. \u2013 Th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 vi\u1ec7c l\u00e0m \u0111\u1ec3 ph\u00f2ng, tr\u00e1nh m\u1ed9t s\u1ed1 b\u1ec7nh li\u00ean quan \u0111\u1ebfn dinh d\u01b0\u1ee1ng v\u00e0 v\u1eadn \u0111\u1ed9ng m\u1ecdi ng\u01b0\u1eddi trong gia \u0111\u00ecnh c\u00f9ng th\u1ef1c hi\u1ec7n. II. \u0110\u1ed3 d\u00f9ng d\u1ea1y h\u1ecdc \u2013 GV: C\u00e1c h\u00ecnh trong b\u00e0i 27 SGK, gi\u1ea5y A3 ho\u1eb7c A0. \u2013 HS: SGK, VBT, b\u00fat m\u00e0u. III. C\u00c1C Ho\u1ea1t \u0111\u1ed9ng d\u1ea1y h\u1ecdc Ti\u1ebft 1 Ho\u1ea1t \u0111\u1ed9ng kh\u1edfi \u0111\u1ed9ng * M\u1ee5c ti\u00eau: T\u1ea1o h\u1ee9ng th\u00fa v\u00e0 kh\u01a1i g\u1ee3i nh\u1eefng hi\u1ec3u bi\u1ebft \u0111\u00e3 c\u00f3 c\u1ee7a HS v\u1ec1 m\u00f4\u0323t s\u00f4\u0301 b\u00ea\u0323nh li\u00ean quan \u0111\u00ea\u0301n dinh d\u01b0\u01a1\u0303ng \u0111\u1ec3 d\u1eabn d\u1eaft v\u00e0o b\u00e0i h\u1ecdc m\u1edbi. * C\u00e1ch ti\u1ebfn h\u00e0nh: \u2013 GV t\u1ed5 ch\u1ee9c cho HS quan sa\u0301t hi\u0300nh 1, 2 (SGK, trang 103). 149"]