Hoc lieu KHTN 7

["A. b\u1eaft \u0111\u1ea7u t\u1eeb l\u00fac tr\u1ee9ng \u0111\u01b0\u1ee3c th\u1ee5 tinh v\u00e0 k\u00e9o d\u00e0i \u0111\u1ebfn l\u00fac B. b\u1eaft \u0111\u1ea7u t\u1eeb khi tr\u1ee9ng n\u1edf ra \u0111\u1ebfn khi gi\u00e0 v\u00e0 ch\u1ebft. chim tr\u01b0\u1edfng th\u00e0nh. C. b\u1eaft \u0111\u1ea7u t\u1eeb h\u1ee3p t\u1eed, di\u1ec5n ra trong tr\u1ee9ng v\u00e0 sau khi tr\u1ee9ng D. b\u1eaft \u0111\u1ea7u t\u1eeb khi tr\u1ee9ng n\u1edf \u0111\u1ebfn khi chim tr\u01b0\u1edfng th\u00e0nh v\u00e0 n\u1edf, k\u1ebft th\u00fac khi gi\u00e0 v\u00e0 ch\u1ebft. sinh s\u1ea3n \u0111\u01b0\u1ee3c. Sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a chim b\u1ed3 c\u00e2u b\u1eaft \u0111\u1ea7u t\u1eeb khi h\u1ee3p t\u1eed \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh cho t\u1edbi khi chim n\u1edf ra \u0111\u1ebfn khi chim ch\u1ebft. Trang 4\/4","\u0110\u00c1P \u00c1N B\u00c0I T\u1eacP B\u00c0I 6: SINH S\u1ea2N V\u00d4 T\u00cdNH \u1ede TH\u1ef0C V\u1eacT H\u1ecdc t\u1ed1t Khoa h\u1ecdc t\u1ef1 nhi\u00ean 7 1. Cho c\u00e1c v\u00ed d\u1ee5 v\u1ec1 sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf th\u1ef1c v\u1eadt nh\u01b0 sau: (1) Rau m\u00e1 sinh s\u1ea3n b\u1eb1ng th\u00e2n b\u00f2. (2) R\u00eau sinh s\u1ea3n b\u1eb1ng th\u00e2n r\u1ec5. (3) C\u1ecf g\u1ea5u sinh s\u1ea3n b\u1eb1ng th\u00e2n b\u00f2. (4) Khoai t\u00e2y sinh s\u1ea3n b\u1eb1ng r\u1ec5 c\u1ee7. (5) C\u00e2y s\u1ed1ng \u0111\u1eddi sinh s\u1ea3n b\u1eb1ng l\u00e1. C\u00f3 bao nhi\u00eau ph\u01b0\u01a1ng \u00e1n \u0111\u00fang? A. 2. B. 5. C. 3. D. 4. Ph\u00e1t bi\u1ec3u \u0111\u00fang l\u00e0: (1), (5). (2) sai. R\u00eau sinh s\u1ea3n b\u1eb1ng b\u00e0o t\u1eed. (3) sai. C\u1ecf g\u1ea5u sinh s\u1ea3n b\u1eb1ng th\u00e2n r\u1ec5. (4) sai. Khoai t\u00e2y sinh s\u1ea3n b\u1eb1ng th\u00e2n c\u1ee7. 2. \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a b\u00e0o t\u1eed l\u00e0 t\u1ea1o \u0111\u01b0\u1ee3c B. nhi\u1ec1u c\u00e1 th\u1ec3 c\u1ee7a m\u1ed9t th\u1ebf h\u1ec7, \u0111\u01b0\u1ee3c ph\u00e1t t\u00e1n nh\u1edd gi\u00f3, A. \u00edt c\u00e1 th\u1ec3 c\u1ee7a m\u1ed9t th\u1ebf h\u1ec7, \u0111\u01b0\u1ee3c ph\u00e1t t\u00e1n ch\u1ec9 nh\u1edd gi\u00f3, n\u01b0\u1edbc, \u0111\u1ea3m b\u1ea3o m\u1edf r\u1ed9ng v\u00f9ng ph\u00e2n b\u1ed1 c\u1ee7a lo\u00e0i. \u0111\u1ea3m b\u1ea3o m\u1edf r\u1ed9ng v\u00f9ng ph\u00e2n b\u1ed1 c\u1ee7a lo\u00e0i. D. nhi\u1ec1u c\u00e1 th\u1ec3 c\u1ee7a m\u1ed9t th\u1ebf h\u1ec7, \u0111\u01b0\u1ee3c ph\u00e1t t\u00e1n ch\u1ec9 nh\u1edd C. \u00edt c\u00e1 th\u1ec3 c\u1ee7a m\u1ed9t th\u1ebf h\u1ec7, \u0111\u01b0\u1ee3c ph\u00e1t t\u00e1n nh\u1edd gi\u00f3, n\u01b0\u1edbc, n\u01b0\u1edbc, \u0111\u1ea3m b\u1ea3o m\u1edf r\u1ed9ng v\u00f9ng ph\u00e2n b\u1ed1 c\u1ee7a lo\u00e0i. \u0111\u1ea3m b\u1ea3o m\u1edf r\u1ed9ng v\u00f9ng ph\u00e2n b\u1ed1 c\u1ee7a lo\u00e0i. \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a b\u00e0o t\u1eed l\u00e0 t\u1ea1o \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e1 th\u1ec3 c\u1ee7a m\u1ed9t th\u1ebf h\u1ec7, \u0111\u01b0\u1ee3c ph\u00e1t t\u00e1n nh\u1edd gi\u00f3, n\u01b0\u1edbc, \u0111\u1ea3m b\u1ea3o m\u1edf r\u1ed9ng v\u00f9ng ph\u00e2n b\u1ed1 c\u1ee7a lo\u00e0i. T\u00fai b\u00e0o t\u1eed (ch\u1ee9a b\u00e0o t\u1eed) \u1edf d\u01b0\u1edbi m\u1eb7t c\u1ee7a l\u00e1, khi t\u00fai b\u00e0o t\u1eed ch\u00edn, v\u1ee1 tung gi\u1ea3i ph\u00f3ng c\u00e1c b\u00e0o t\u1eed - g\u1ed3m r\u1ea5t nhi\u1ec1u b\u00e0o t\u1eed con, \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1n nh\u1edd gi\u00f3 th\u1ed5i, n\u01b0\u1edbc cu\u1ed1n tr\u00f4i, ho\u1eb7c c\u00f4n tr\u00f9ng - c\u00f4n tr\u00f9ng th\u01b0\u1eddng \u00edt \u0103n b\u00e0o t\u1eed v\u00ec kh\u00f4ng c\u00f3 nhi\u1ec1u dinh d\u01b0\u1ee1ng, tuy nhi\u00ean ch\u00fang c\u00f3 th\u1ec3 d\u00ednh v\u00e0o c\u01a1 th\u1ec3 c\u00f4n tr\u00f9ng m\u00e0 \u0111\u01b0\u1ee3c ch\u00fang mang \u0111i xa => m\u1edf r\u1ed9ng s\u1ef1 ph\u00e2n b\u1ed1 c\u1ee7a lo\u00e0i. B\u00e0o t\u1eed g\u1eb7p \u0111\u1ea5t \u1ea9m nguy\u00ean ph\u00e2n nhi\u1ec1u l\u1ea7n cho c\u01a1 th\u1ec3 \u0111\u01a1n b\u1ed9i. 3. Trong thi\u00ean nhi\u00ean c\u00e2y tre c\u00f3 th\u1ec3 sinh s\u1ea3n b\u1eb1ng A. r\u1ec5 ph\u1ee5. B. l\u00f3ng. C. th\u00e2n r\u1ec5. D. th\u00e2n b\u00f2. Ngo\u00e0i t\u1ef1 nhi\u00ean c\u00e2y tre sinh s\u1ea3n b\u1eb1ng th\u00e2n r\u1ec5. Tre l\u00e0 c\u00e2y M\u1ed9t l\u00e1 m\u1ea7m sinh s\u1ea3n sinh d\u01b0\u1ee1ng b\u1eb1ng th\u00e2n r\u1ec5, c\u00e2y con m\u1ecdc \u00e1p s\u00e1t ngay c\u1ea1nh c\u00e2y m\u1eb9 t\u1ea1o n\u00ean m\u1ed9t qu\u1ea7n th\u1ec3 tre ch\u1ee9 kh\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t c\u00e1 th\u1ec3 \u0111\u1ee9ng ri\u00eang l\u1ebb. 4. Sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n B. ch\u1ec9 c\u1ea7n giao t\u1eed c\u00e1i. A. kh\u00f4ng c\u00f3 s\u1ef1 h\u1ee3p nh\u1ea5t gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. D. c\u00f3 s\u1ef1 h\u1ee3p nh\u1ea5t gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. C. c\u1ea7n 2 c\u00e1 th\u1ec3. Sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. 5. C\u1ea7n ph\u1ea3i c\u1eaft b\u1ecf h\u1ebft l\u00e1 \u1edf c\u00e0nh gh\u00e9p l\u00e0 v\u00ec m\u1ee5c \u0111\u00edch ch\u00ednh n\u00e0o? B. \u0110\u1ec3 t\u1eadp trung n\u01b0\u1edbc nu\u00f4i c\u00e1c c\u00e0nh gh\u00e9p. A. \u0110\u1ec3 ti\u1ebft ki\u1ec7m ngu\u1ed3n ch\u1ea5t dinh d\u01b0\u1ee1ng cung c\u1ea5p cho l\u00e1. D. \u0110\u1ec3 tr\u00e1nh gi\u00f3, m\u01b0a l\u00e0m lay c\u00e0nh gh\u00e9p. C. \u0110\u1ec3 lo\u1ea1i b\u1ecf s\u00e2u b\u1ec7nh tr\u00ean c\u00e0nh gh\u00e9p. C\u00e0nh gh\u00e9p l\u00e0 ph\u1ea7n c\u00e0nh c\u1ee7a c\u00e2y n\u00e0y \u0111\u01b0\u1ee3c c\u1eaft r\u1eddi \u0111\u1ec3 gh\u00e9p v\u00e0o m\u1ed9t c\u00e2y kh\u00e1c. Khi m\u1edbi gh\u00e9p ph\u1ea7n m\u00f4 d\u1eabn c\u1ee7a c\u00e0nh gh\u00e9p v\u00e0 g\u1ed1c gh\u00e9p ch\u01b0a \u0111\u01b0\u1ee3c n\u1ed1i li\u1ec1n do \u0111\u00f3 vi\u1ec7c cung c\u1ea5p n\u01b0\u1edbc t\u1eeb g\u1ed1c l\u00ean c\u00e0nh gh\u00e9p b\u1ecb h\u1ea1n ch\u1ebf; v\u00ec v\u1eady ng\u01b0\u1eddi ta th\u01b0\u1eddng c\u1eaft h\u1ebft l\u00e1 \u1edf c\u00e0nh gh\u00e9p \u0111\u1ec3 h\u1ea1n ch\u1ebf s\u1ef1 tho\u00e1t h\u01a1i n\u01b0\u1edbc trong khi n\u01b0\u1edbc cung c\u1ea5p c\u00f2n thi\u1ebfu \u0111\u1ea3m b\u1ea3o \u0111\u1ee7 n\u01b0\u1edbc cho c\u00e0nh gh\u00e9p ph\u00e1t tri\u1ec3n. 6. Sinh s\u1ea3n v\u00f4 t\u00ednh kh\u00f4ng t\u1ea1o th\u00e0nh A. b\u00e0o t\u1eed. B. h\u1ee3p t\u1eed. C. c\u00e2y con. D. giao t\u1eed. Sinh s\u1ea3n v\u00f4 t\u00ednh kh\u00f4ng th\u1ec3 t\u1ea1o th\u00e0nh h\u1ee3p t\u1eed v\u00ec kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. 7. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0o sau \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 l\u1ee3i th\u1ebf c\u1ee7a gi\u00e2m c\u00e0nh, chi\u1ebft c\u00e0nh? Trang 1\/3","A. Ti\u1ebft ki\u1ec7m c\u00f4ng ch\u0103m b\u00f3n. B. Gi\u1eef nguy\u00ean t\u00ednh tr\u1ea1ng t\u1ed1t m\u00e0 con ng\u01b0\u1eddi mong mu\u1ed1n. C. C\u00f3 t\u00ednh ch\u1ed1ng ch\u1ecbu cao. D. Th\u1eddi gian thu ho\u1ea1ch ng\u1eafn. Gi\u00e2m c\u00e0nh v\u00e0 chi\u1ebft c\u00e0nh \u0111\u1ec1u c\u00f3 c\u00e1c l\u1ee3i th\u1ebf nh\u01b0: - Gi\u1eef nguy\u00ean t\u00ednh tr\u1ea1ng t\u1ed1t m\u00e0 con ng\u01b0\u1eddi mong mu\u1ed1n. - Th\u1eddi gian thu ho\u1ea1ch ng\u1eafn. - Ti\u1ebft ki\u1ec7m c\u00f4ng ch\u0103m b\u00f3n. 8. Trong h\u00ecnh th\u1ee9c sinh s\u1ea3n sinh d\u01b0\u1ee1ng t\u1ef1 nhi\u00ean, c\u00e2y con c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1eeb nh\u1eefng b\u1ed9 ph\u1eadn n\u00e0o sau \u0111\u00e2y c\u1ee7a c\u00e2y m\u1eb9? 1 - L\u00e1 2 - Hoa 3 - H\u1ea1t 4 - R\u1ec5 5 - Th\u00e2n 6 - C\u1ee7 7 - Th\u00e2n c\u1ee7 A. 1, 2, 6. B. 1, 2, 4, 5, 6, 7. C. 1, 4, 5, 6, 7. D. 3, 4, 5, 6, 7. Sinh s\u1ea3n sinh d\u01b0\u1ee1ng l\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n v\u00f4 t\u00ednh trong \u0111\u00f3 c\u01a1 th\u1ec3 m\u1edbi h\u00ecnh th\u00e0nh t\u1eeb m\u1ed9t b\u1ed9 ph\u1eadn sinh d\u01b0\u1ee1ng c\u1ee7a c\u01a1 th\u1ec3 m\u1eb9. Lo\u1ea1i b\u1ecf: 2 - Hoa; 3 - H\u1ea1t. 9. Sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf th\u1ef1c v\u1eadt l\u00e0 c\u00e2y non \u0111\u01b0\u1ee3c sinh ra mang \u0111\u1eb7c t\u00ednh B. gi\u1ed1ng c\u00e2y m\u1eb9, kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 A. gi\u1ed1ng b\u1ed1 m\u1eb9, c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed giao t\u1eed c\u00e1i. D. gi\u1ed1ng c\u00e2y m\u1eb9, c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao c\u00e1i. t\u1eed c\u00e1i. C. gi\u1ed1ng v\u00e0 kh\u00e1c c\u00e2y m\u1eb9, kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. Sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf th\u1ef1c v\u1eadt l\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. C\u01a1 th\u1ec3 con \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb m\u1ed9t ph\u1ea7n c\u01a1 th\u1ec3 m\u1eb9 n\u00ean gi\u1ed1ng nhau v\u00e0 gi\u1ed1ng m\u1eb9. 10. X\u00e9t c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sau: (1) C\u00e1 th\u1ec3 s\u1ed1ng \u0111\u1ed9c l\u1eadp, \u0111\u01a1n l\u1ebb v\u1eabn c\u00f3 th\u1ec3 t\u1ea1o ra con ch\u00e1u. V\u00ec v\u1eady, c\u00f3 l\u1ee3i trong tr\u01b0\u1eddng h\u1ee3p m\u1eadt \u0111\u1ed9 qu\u1ea7n th\u1ec3 th\u1ea5p. (2) T\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 th\u00edch nghi t\u1ed1t v\u1edbi m\u00f4i tr\u01b0\u1eddng s\u1ed1ng \u1ed5n \u0111\u1ecbnh, \u00edt bi\u1ebfn \u0111\u1ed9ng, nh\u1edd v\u1eady qu\u1ea7n th\u1ec3 ph\u00e1t tri\u1ec3n nhanh. (3) T\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 m\u1edbi gi\u1ed1ng nhau v\u00e0 gi\u1ed1ng c\u00e1 th\u1ec3 m\u1eb9 v\u1ec1 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m di truy\u1ec1n. (4) T\u1ea1o ra s\u1ed1 l\u01b0\u1ee3ng con ch\u00e1u gi\u1ed1ng trong m\u1ed9t th\u1eddi gian ng\u1eafn. (5) Cho ph\u00e9p t\u0103ng hi\u1ec7u su\u1ea5t sinh s\u1ea3n v\u00ec kh\u00f4ng ph\u1ea3i ti\u00eau t\u1ed1n n\u0103ng l\u01b0\u1ee3ng cho vi\u1ec7c t\u1ea1o giao t\u1eed v\u00e0 th\u1ee5 tinh. (6)T\u1ea1o ra th\u1ebf h\u1ec7 con ch\u00e1u gi\u1ed1ng nhau v\u1ec1 m\u1eb7t di truy\u1ec1n n\u00ean c\u00f3 l\u1ee3i th\u1ebf khi \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng thay \u0111\u1ed5i. Sinh s\u1ea3n v\u00f4 t\u00ednh c\u00f3 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0o? A. (3) v\u00e0 (5). B. (1), (2), (3), (4) v\u00e0 (5). C. (1), (2), (3), (4) v\u00e0 (6). D. (1) v\u00e0 (2). Sinh s\u1ea3n v\u00f4 t\u00ednh c\u00f3 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m: -Ch\u1ec9 c\u1ea7n 1 c\u00e1 th\u1ec3 c\u0169ng c\u00f3 th\u1ec3 t\u1ea1o ra nhi\u1ec1u c\u00e1 th\u1ec3 m\u1edbi n\u00ean c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i nhanh s\u1ed1 l\u01b0\u1ee3ng c\u00e1c c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 trong \u0111i\u1ec1u ki\u1ec7n m\u1eadt \u0111\u1ed9 th\u1ea5p. -Con c\u00e1i sinh ra trong h\u00ecnh th\u1ee9c sinh s\u1ea3n v\u00f4 t\u00ednh gi\u1ed1ng nhau v\u00e0 gi\u1ed1ng c\u00e2y m\u1eb9 \u2192 B\u1ea3o t\u1ed3n c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m t\u1ed1t c\u1ee7a c\u00e2y m\u1eb9, t\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 m\u1edbi c\u00f3 t\u00ednh th\u00edch nghi cao trong \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng kh\u00f4ng thay \u0111\u1ed5i. - C\u01a1 s\u1edf t\u1ebf b\u00e0o h\u1ecdc: T\u1ebf b\u00e0o m\u1eb9 s\u1eed d\u1ee5ng h\u00ecnh th\u1ee9c nguy\u00ean ph\u00e2n \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u01a1 th\u1ec3 con. 11. C\u00f3 bao nhi\u00eau ph\u00e1t bi\u1ec3u \u0111\u00fang trong c\u00e1c ph\u00e1t bi\u1ec3u d\u01b0\u1edbi \u0111\u00e2y khi n\u00f3i v\u1ec1 l\u1ee3i \u00edch c\u1ee7a c\u00e2y m\u1ecdc t\u1eeb c\u00e0nh chi\u1ebft so v\u1edbi c\u00e2y m\u1ecdc t\u1eeb h\u1ea1t? (1) \u0110\u1eb7c t\u00ednh di truy\u1ec3n gi\u1ed1ng c\u00e2y m\u1eb9. (2) C\u00e2y con d\u1ec5 ch\u0103m s\u00f3c. (3) C\u00f9ng l\u00fac t\u1ea1o \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e2y con t\u1eeb m\u1ed9t c\u00e2y m\u1eb9. (4) C\u00f3 r\u1ec5 ngay tr\u00ean c\u00e2y m\u1eb9 n\u00ean c\u00e1c c\u00e2y con m\u1ecdc t\u1eeb c\u00e0nh chi\u1ebft d\u1ec5 th\u00edch nghi v\u1edbi m\u00f4i tr\u01b0\u1eddng bi\u1ebfn \u0111\u1ed5i. (5) Th\u1eddi gian thu ho\u1ea1ch s\u1edbm. A. 5. B. 4. C. 2. D. 3. C\u00e2y m\u1ecdc t\u1eeb c\u00e0nh chi\u1ebft s\u1ebd: (1) \u0110\u1eb7c t\u00ednh di truy\u1ec1n gi\u1ed1ng m\u1eb9. (3) C\u00f9ng l\u00fac t\u1ea1o \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e2y con t\u1eeb m\u1ed9t c\u00e2y m\u1eb9. (5) Th\u1eddi gian thu ho\u1ea1ch s\u1edbm. \u00dd (2), (4) kh\u00f4ng \u0111\u00fang v\u00ec \u0111\u1eb7c t\u00ednh di truy\u1ec1n c\u1ee7a c\u00e2y con gi\u1ed1ng m\u1eb9 n\u00ean k\u00e9m th\u00edch nghi khi \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng thay \u0111\u1ed5i. Trang 2\/3","12. Trong sinh s\u1ea3n sinh d\u01b0\u1ee1ng \u1edf th\u1ef1c v\u1eadt, c\u00e2y m\u1edbi \u0111\u01b0\u1ee3c t\u1ea1o ra B. ch\u1ec9 t\u1eeb m\u1ed9t ph\u1ea7n th\u00e2n c\u1ee7a c\u00e2y. A. t\u1eeb m\u1ed9t ph\u1ea7n c\u1ee7a c\u01a1 quan sinh d\u01b0\u1ee1ng c\u1ee7a c\u00e2y. D. ch\u1ec9 t\u1eeb r\u1ec5 c\u1ee7a c\u00e2y. C. ch\u1ec9 t\u1eeb l\u00e1 c\u1ee7a c\u00e2y. Sinh s\u1ea3n sinh d\u01b0\u1ee1ng l\u00e0 c\u01a1 th\u1ec3 m\u1edbi \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh t\u1eeb c\u01a1 quan sinh d\u01b0\u1ee1ng c\u1ee7a c\u01a1 th\u1ec3 m\u1eb9 (r\u1ec5, th\u00e2n, l\u00e1, \u2026). 13. H\u00ecnh th\u1ee9c sinh s\u1ea3n c\u1ee7a c\u00e2y d\u01b0\u01a1ng x\u1ec9 l\u00e0 sinh s\u1ea3n A. ph\u00e2n \u0111\u00f4i. B. b\u1eb1ng b\u00e0o t\u1eed. C. h\u1eefu t\u00ednh. D. dinh d\u01b0\u1ee1ng. H\u00ecnh th\u1ee9c sinh s\u1ea3n c\u1ee7a c\u00e2y d\u01b0\u01a1ng x\u1ec9 l\u00e0 sinh s\u1ea3n b\u1eb1ng b\u00e0o t\u1eed, t\u00fai b\u00e0o t\u1eed n\u1eb1m trong nh\u1eefng \u0111\u1ed1m nh\u1ecf d\u01b0\u1edbi c\u00e1c l\u00e1 gi\u00e0. 14. Trong c\u00e1c ph\u01b0\u01a1ng ph\u00e1p sau, ph\u01b0\u01a1ng ph\u00e1p nh\u00e2n gi\u1ed1ng v\u00f4 t\u00ednh n\u00e0o c\u00f3 hi\u1ec7u qu\u1ea3 nh\u1ea5t hi\u1ec7n nay? A. Gieo t\u1eeb h\u1ea1t. B. Nu\u00f4i c\u1ea5y m\u00f4. C. Gi\u00e2m c\u00e0nh. D. Chi\u1ebft c\u00e0nh. Trong c\u00e1c ph\u01b0\u01a1ng ph\u00e1p tr\u00ean th\u00ec gieo t\u1eeb h\u1ea1t l\u00e0 ph\u01b0\u01a1ng ph\u00e1p nh\u00e2n gi\u1ed1ng v\u1eadn d\u1ee5ng h\u00ecnh th\u1ee9c sinh s\u1ea3n h\u1eefu t\u00ednh. C\u00f2n 3 ph\u01b0\u01a1ng ph\u00e1p c\u00f2n l\u1ea1i \u0111\u1ec1u l\u00e0 ph\u01b0\u01a1ng ph\u00e1p nh\u00e2n gi\u1ed1ng v\u00f4 t\u00ednh, trong \u0111\u00f3 nu\u00f4i c\u1ea5y m\u00f4 l\u00e0 ph\u01b0\u01a1ng ph\u00e1p c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m nh\u1ea5t: t\u1ea1o nhanh gi\u1ed1ng m\u1edbi, s\u1ea1ch b\u1ec7nh, c\u00f3 hi\u1ec7u qu\u1ea3 kinh t\u1ebf cao. 15. T\u1eeb m\u1ed9t t\u1ebf b\u00e0o ho\u1eb7c m\u00f4 th\u1ef1c v\u1eadt c\u00f3 th\u1ec3 nu\u00f4i c\u1ea5y \u0111\u1ec3 ph\u00e1t tri\u1ec3n th\u00e0nh m\u1ed9t c\u00e2y ho\u00e0n ch\u1ec9nh l\u00e0 nh\u1edd \u0111\u1eb7c t\u00ednh n\u00e0o c\u1ee7a t\u1ebf b\u00e0o th\u1ef1c v\u1eadt? A. Chuy\u00ean h\u00f3a cao. B. Ph\u00e2n h\u00f3a. C. To\u00e0n n\u0103ng. D. T\u1ef1 d\u01b0\u1ee1ng. - V\u00ec t\u1ebf b\u00e0o th\u1ef1c v\u1eadt c\u00f3 t\u00ednh to\u00e0n n\u0103ng n\u00ean t\u1eeb m\u1ed9t t\u1ebf b\u00e0o c\u00f3 th\u1ec3 ph\u00e1t tri\u1ec3n th\u00e0nh c\u00e2y ho\u00e0n ch\u1ec9nh v\u1edbi c\u00e1c c\u01a1 quan r\u1ec5, th\u00e2n, l\u00e1. -T\u1ebf b\u00e0o th\u1ef1c v\u1eadt c\u00f3 t\u00ednh to\u00e0n n\u0103ng. T\u1ee9c l\u00e0 m\u1ecdi t\u1ebf b\u00e0o s\u1ebd \u0111\u1ec1u c\u00f3 c\u00f9ng h\u1ec7 gen v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng sinh s\u1ea3n v\u00f4 t\u00ednh. Do \u0111\u00f3, ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nu\u00f4i c\u1ea5y trong m\u00f4i tr\u01b0\u1eddng thu\u1eadn l\u1ee3i \u0111\u1ec3 t\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 m\u1edbi \u0111\u1ed3ng lo\u1ea1t v\u1ec1 t\u00ednh tr\u1ea1ng, ki\u1ec3u gen v\u00e0 ki\u1ec3u h\u00ecnh. Trang 3\/3","\u0110\u00c1P \u00c1N B\u00c0I T\u1eacP B\u00c0I 7: SINH S\u1ea2N V\u00d4 T\u00cdNH \u1ede \u0110\u1ed8NG V\u1eacT H\u1ecdc t\u1ed1t Khoa h\u1ecdc t\u1ef1 nhi\u00ean 7 1. \u0110\u1ec3 thay th\u1eadn cho m\u1ed9t b\u1ec7nh nh\u00e2n, tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y cho k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t? A. D\u00f9ng th\u1eadn c\u1ee7a b\u1ed1 ho\u1eb7c m\u1eb9 \u0111\u1ec3 thay th\u1ebf. B. D\u00f9ng th\u1eadn c\u1ee7a anh (ch\u1ecb, em) song sinh v\u1edbi ng\u01b0\u1eddi b\u1ec7nh. C. Ng\u01b0\u1eddi cho th\u1eadn l\u00e0 v\u1ee3 (ho\u1eb7c ch\u1ed3ng) c\u1ee7a b\u1ec7nh nh\u00e2n. D. Ch\u1ec9 c\u1ea7n ng\u01b0\u1eddi cho th\u1eadn c\u00f3 c\u00f9ng nh\u00f3m m\u00e1u v\u1edbi ng\u01b0\u1eddi b\u1ec7nh. Tr\u01b0\u1eddng h\u1ee3p d\u00f9ng th\u1eadn c\u1ee7a anh (ch\u1ecb, em) song sinh v\u1edbi ng\u01b0\u1eddi b\u1ec7nh cho k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t l\u00e0 v\u00ec b\u1ed9 gen c\u1ee7a h\u1ecd gi\u1ed1ng nhau c\u00f3 th\u1ec3 coi nh\u01b0 s\u1ef1 t\u1ef1 gh\u00e9p. 2. Nguy\u00ean t\u1eafc c\u1ee7a nh\u00e2n b\u1ea3n v\u00f4 t\u00ednh l\u00e0 chuy\u1ec3n nh\u00e2n c\u1ee7a t\u1ebf b\u00e0o B. soma (2n) v\u00e0o m\u1ed9t t\u1ebf b\u00e0o tr\u1ee9ng, r\u1ed3i k\u00edch th\u00edch t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5y nh\u00e2n ph\u00e1t tri\u1ec3n th\u00e0nh ph\u00f4i r\u1ed3i ph\u00e1t A. soma, k\u00edch th\u00edch t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5y nh\u00e2n ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. tri\u1ec3n th\u00e0nh ph\u00f4i r\u1ed3i ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. D. soma (n) v\u00e0o m\u1ed9t t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 l\u1ea5y m\u1ea5t nh\u00e2n, r\u1ed3i k\u00edch th\u00edch t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5y nh\u00e2n ph\u00e1t tri\u1ec3n th\u00e0nh C. soma (2n) v\u00e0o m\u1ed9t t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 l\u1ea5y m\u1ea5t nh\u00e2n, r\u1ed3i ph\u00f4i r\u1ed3i ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. k\u00edch th\u00edch t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5y nh\u00e2n ph\u00e1t tri\u1ec3n th\u00e0nh ph\u00f4i r\u1ed3i ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. Nguy\u00ean t\u1eafc c\u1ee7a nh\u00e2n b\u1ea3n v\u00f4 t\u00ednh l\u00e0 chuy\u1ec3n nh\u00e2n c\u1ee7a t\u1ebf b\u00e0o soma (2n) v\u00e0o m\u1ed9t t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 l\u1ea5y m\u1ea5t nh\u00e2n, r\u1ed3i k\u00edch th\u00edch t\u1ebf b\u00e0o tr\u1ee9ng \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5y nh\u00e2n ph\u00e1t tri\u1ec3n th\u00e0nh ph\u00f4i r\u1ed3i ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. 3. C\u00f3 bao nhi\u00eau lo\u00e0i sinh v\u1eadt sau \u0111\u00e2y c\u00f3 h\u00ecnh th\u1ee9c sinh s\u1ea3n trinh sinh? (1) Ong. (2) Chu\u1ed9t t\u00fai. (3) M\u1ed1i. (4) T\u00f2 v\u00f2. (5) R\u1ec7p. (6) Ki\u1ebfn. (7) Mu\u1ed7i. (8) Th\u1eb1n l\u1eb1n \u0111\u00e1. A. 8. B. 4. C. 2. D. 6. C\u00e1c lo\u00e0i sinh v\u1eadt c\u00f3 h\u00ecnh th\u1ee9c sinh s\u1ea3n trinh sinh l\u00e0: (1), (3), (4), (5), (6), (8). 4. \u01afu \u0111i\u1ec3m c\u1ee7a sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 B. sinh s\u1ea3n v\u00f4 t\u00ednh \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong ti\u1ebfn h\u00f3a. A. t\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 con th\u00edch nghi cao v\u1edbi \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng. D. sinh s\u1ea3n d\u1ec5 d\u00e0ng trong \u0111i\u1ec1u ki\u1ec7n qu\u1ea7n th\u1ec3 c\u00f3 s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf. C. t\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 con \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa. \u01afu \u0111i\u1ec3m c\u1ee7a sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 sinh s\u1ea3n d\u1ec5 d\u00e0ng trong \u0111i\u1ec1u ki\u1ec7n qu\u1ea7n th\u1ec3 c\u00f3 s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf. 5. \u1ede ong, c\u00e1c ong th\u1ee3 B. g\u1ed3m to\u00e0n ong c\u00e1i c\u00f3 kh\u1ea3 n\u0103ng sinh s\u1ea3n. A. g\u1ed3m to\u00e0n ong c\u00e1i kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng sinh s\u1ea3n. D. c\u00f3 th\u1ec3 g\u1ed3m ong \u0111\u1ef1c v\u00e0 c\u00e1i nh\u01b0ng kh\u00f4ng sinh s\u1ea3n. C. g\u1ed3m to\u00e0n ong \u0111\u1ef1c kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng sinh s\u1ea3n. \u1ede lo\u00e0i ong c\u00f3 3 lo\u1ea1i ong: Ong ch\u00faa, l\u00e0 con c\u00e1i (2n) c\u00f3 kh\u1ea3 n\u0103ng sinh s\u1ea3n Ong \u0111\u1ef1c (n) ch\u1ec9 c\u00f3 nhi\u1ec7m v\u1ee5 th\u1ee5 tinh cho tr\u1ee9ng Ong th\u1ee3 l\u00e0 c\u00e1c con ong c\u00e1i (2n) nh\u01b0ng kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng sinh s\u1ea3n, ch\u1ec9 l\u00e0m nhi\u1ec7m v\u1ee5 ki\u1ebfm \u0103n v\u00e0 b\u1ea3o v\u1ec7 t\u1ed5. 6. Tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a sinh s\u1ea3n v\u00f4 t\u00ednh? Trang 1\/3","A. Nh\u00e2n b\u1ea3n v\u00f4 t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt. B. Chuy\u1ec3n gen t\u1eeb lo\u00e0i n\u00e0y sang lo\u00e0i kh\u00e1c. C. Gh\u00e9p c\u01a1 quan t\u1eeb ng\u01b0\u1eddi n\u00e0y sang ng\u01b0\u1eddi kh\u00e1c. D. Nu\u00f4i c\u00e2y m\u00f4 trong m\u00f4i tr\u01b0\u1eddng nh\u00e2n t\u1ea1o. Chuy\u1ec3n gen t\u1eeb lo\u00e0i n\u00e0y sang lo\u00e0i kh\u00e1c l\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a c\u00f4ng ngh\u1ec7 gen ch\u1ee9 kh\u00f4ng ph\u1ea3i \u1ee9ng d\u1ee5ng c\u1ee7a sinh s\u1ea3n v\u00f4 t\u00ednh. 7. M\u1ed7i m\u1ea3nh v\u1ee5n c\u01a1 th\u1ec3 m\u1eb9 c\u00f3 th\u1ec3 t\u00e1i sinh th\u00e0nh m\u1ed9t c\u01a1 th\u1ec3 ho\u00e0n ch\u1ec9nh l\u00e0 ki\u1ec3u sinh s\u1ea3n th\u01b0\u1eddng g\u1eb7p \u1edf A. Th\u1eb1n l\u1eb1n. B. Ru\u1ed9t khoang. C. B\u1ecdt bi\u1ec3n. D. Ch\u00e2n kh\u1edbp ( t\u00f4m, cua). \u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c ph\u00e2n m\u1ea3nh, h\u00ecnh th\u1ee9c n\u00e0y c\u00f3 \u1edf b\u1ecdt bi\u1ec3n. Ru\u1ed9t khoang c\u00f3 h\u00ecnh th\u1ee9c n\u1ea3y ch\u1ed3i, ch\u00e2n kh\u1edbp, th\u1eb1n l\u1eb1n sinh s\u1ea3n h\u1eefu t\u00ednh ho\u1eb7c v\u00f4 t\u00ednh nh\u01b0ng kh\u00f4ng ph\u1ea3i ph\u00e2n m\u1ea3nh. 8. Th\u1eb1n l\u1eb1n b\u1ecb m\u1ea5t \u0111u\u00f4i c\u00f3 th\u1ec3 m\u1ecdc ra \u0111u\u00f4i m\u1edbi, \u0111\u00f3 l\u00e0 B. m\u1ed9t ki\u1ec3u c\u1ee7a s\u1ef1 sinh tr\u01b0\u1edfng. A. ch\u1ec9 l\u00e0 s\u1ef1 t\u00e1i sinh m\u1ed9t b\u1ed9 ph\u1eadn c\u01a1 th\u1ec3. D. k\u00ecnh th\u1ee9c sinh s\u1ea3n ph\u00e2n m\u1ea3nh. C. ki\u1ec3u sinh s\u1ea3n v\u00f4 t\u00ednh t\u00e1i sinh. C\u00e1i \u0111u\u00f4i m\u1edbi c\u1ee7a th\u1eb1n l\u1eb1n kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t c\u01a1 th\u1ec3 n\u00ean \u0111\u00e2y ch\u1ec9 \u0111\u01b0\u1ee3c coi l\u00e0 s\u1ef1 t\u00e1i sinh m\u1ed9t b\u1ed9 ph\u1eadn c\u01a1 th\u1ec3. 9. Sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt l\u00e0 A. m\u1ed9t c\u00e1 th\u1ec3 lu\u00f4n sinh ra nhi\u1ec1u c\u00e1 th\u1ec3 gi\u1ed1ng m\u00ecnh, kh\u00f4ng B. m\u1ed9t c\u00e1 th\u1ec3 sinh ra m\u1ed9t hay nhi\u1ec1u c\u00e1 th\u1ec3 gi\u1ed1ng m\u00ecnh, c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng v\u00e0 tr\u1ee9ng. kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng v\u00e0 tr\u1ee9ng. C. m\u1ed9t c\u00e1 th\u1ec3 lu\u00f4n sinh ra ch\u1ec9 m\u1ed9t c\u00e1 th\u1ec3 gi\u1ed1ng m\u00ecnh, D. m\u1ed9t c\u00e1 th\u1ec3 sinh ra m\u1ed9t hay nhi\u1ec1u c\u00e1 th\u1ec3 gi\u1ed1ng v\u00e0 kh\u00e1c kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng v\u00e0 tr\u1ee9ng. m\u00ecnh, kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa t\u1ec9nh tr\u00f9ng v\u00e0 tr\u1ee9ng. Sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt l\u00e0 m\u1ed9t c\u00e1 th\u1ec3 lu\u00f4n sinh ra m\u1ed9t ho\u1eb7c nhi\u1ec1u c\u00e1 th\u1ec3 gi\u1ed1ng m\u00ecnh, kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng v\u00e0 tr\u1ee9ng. 10. T\u1eeb m\u1ed9t c\u01a1 th\u1ec3 m\u1eb9 ch\u1ec9 h\u00ecnh th\u00e0nh \u0111\u01b0\u1ee3c 2 c\u01a1 th\u1ec3 m\u1edbi gi\u1ed1ng nhau v\u00e0 gi\u1ed1ng h\u1ec7t m\u1eb9 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 A. sinh \u0111\u00f4i. B. tr\u1ef1c ph\u00e2n. C. ph\u00e2n b\u00e0o nguy\u00ean D. ph\u00e2n m\u1ea3nh. nhi\u1ec5m. \u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c tr\u1ef1c ph\u00e2n \u1edf \u0111\u1ed9ng v\u1eadt \u0111\u01a1n b\u00e0o. B sai v\u00ec nguy\u00ean ph\u00e2n h\u00ecnh th\u00e0nh 2 t\u1ebf b\u00e0o nh\u01b0ng ch\u01b0a ph\u1ea3i l\u00e0 c\u01a1 th\u1ec3. C sai v\u00ec ph\u00e2n m\u1ea3nh t\u1ea1o ra nhi\u1ec1u h\u01a1n 2 c\u01a1 th\u1ec3. D sai v\u00ec sinh \u0111\u00f4i c\u00f3 th\u1ec3 t\u1ea1o ra 2 c\u01a1 th\u1ec3 kh\u00e1c nhau. 11. Sinh s\u1ea3n v\u00f4 t\u00ednh d\u1ef1a tr\u00ean c\u01a1 s\u1edf A. ph\u00e2n b\u00e0o gi\u1ea3m nhi\u1ec5m. B. ph\u00e2n b\u00e0o gi\u1ea3m nhi\u1ec5m v\u00e0 ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m. C. ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m. D. ph\u00e2n b\u00e0o gi\u1ea3m nhi\u1ec5m, ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m v\u00e0 th\u1ee5 tinh. Sinh s\u1ea3n v\u00f4 t\u00ednh d\u1ef1a tr\u00ean c\u01a1 s\u1edf ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m (Nguy\u00ean ph\u00e2n). 12. Truy\u1ec1n m\u00e1u gi\u1eefa hai anh em sinh \u0111\u00f4i c\u00f9ng tr\u1ee9ng c\u00f3 th\u1ec3 coi l\u00e0 B. t\u1ef1 gh\u00e9p v\u00ec hai c\u01a1 th\u1ec3 c\u00f3 ki\u1ec3u gen ho\u00e0n to\u00e0n gi\u1ed1ng A. tr\u01b0\u1eddng h\u1ee3p n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 gh\u00e9p m\u00f4. nhau. C. d\u1ecb gh\u00e9p, v\u00ec hai c\u01a1 th\u1ec3 c\u00f3 th\u1ec3 kh\u00f4ng c\u00f9ng nh\u00f3m m\u00e1u. D. \u0111\u1ed3ng gh\u00e9p, v\u00ec \u0111\u00e2y l\u00e0 hai c\u01a1 th\u1ec3 kh\u00e1c nhau. Truy\u1ec1n m\u00e1u kh\u00f4ng \u0111\u01b0\u1ee3c coi l\u00e0 gh\u00e9p m\u00f4 v\u00ec c\u00e1c t\u1ebf b\u00e0o m\u00e1u n\u00e0y ch\u1ec9 l\u00e0m nhi\u1ec7m v\u1ee5 v\u1eadn chuy\u1ec3n kh\u00ed, d\u01b0\u1ee1ng ch\u1ea5t sau \u0111\u00f3 c\u00e1c t\u1ebf b\u00e0o n\u00e0y \u0111\u01b0\u1ee3c thay th\u1ebf b\u1edfi c\u00e1c t\u1ebf b\u00e0o m\u1edbi m\u00e0 c\u01a1 th\u1ec3 s\u1ea3n sinh ra. N\u1ebfu gh\u00e9p t\u1ebf b\u00e0o t\u1ee7y x\u01b0\u01a1ng ho\u1eb7c t\u1ebf b\u00e0o sinh m\u00e1u m\u1edbi \u0111\u01b0\u1ee3c coi l\u00e0 gh\u00e9p m\u00f4. 13. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0o kh\u00f4ng \u0111\u00fang v\u1edbi sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt? B. C\u00e1 th\u1ec3 c\u00f3 th\u1ec3 s\u1ed1ng \u0111\u1ed9c l\u1eadp, \u0111\u01a1n l\u1ebb v\u1eabn sinh s\u1ea3n b\u00ecnh A. C\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi cao v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a \u0111i\u1ec1u th\u01b0\u1eddng. ki\u1ec7n m\u00f4i tr\u01b0\u1eddng. D. \u0110\u1ea3m b\u1ea3o s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u1ec1 m\u1eb7t di truy\u1ec1n qua c\u00e1c th\u1ebf h\u1ec7 c\u01a1 th\u1ec3. C. T\u1ea1o ra s\u1ed1 l\u01b0\u1ee3ng l\u1edbn con ch\u00e1u trong th\u1eddi gian ng\u1eafn. C\u00e1c c\u00e1 th\u1ec3 sinh ra t\u1eeb sinh s\u1ea3n v\u00f4 t\u00ednh c\u00f3 ki\u1ec3u gen gi\u1ed1ng nhau v\u00e0 gi\u1ed1ng c\u01a1 th\u1ec3 m\u1eb9 n\u00ean khi m\u00f4i tr\u01b0\u1eddng thay \u0111\u1ed5i c\u00f3 th\u1ec3 b\u1ecb ch\u1ebft h\u00e0ng lo\u1ea1t \u2192 kh\u00f4ng th\u00edch nghi t\u1ed1t v\u1edbi m\u00f4i tr\u01b0\u1eddng. 14. Nh\u1eefng h\u00ecnh th\u1ee9c sinh s\u1ea3n v\u00f4 t\u00ednh n\u00e0o ch\u1ec9 c\u00f3 \u1edf \u0111\u1ed9ng kh\u00f4ng x\u01b0\u01a1ng s\u1ed1ng? Trang 2\/3","A. Trinh sinh, ph\u00e2n \u0111\u00f4i. B. Ph\u00e2n \u0111\u00f4i, n\u1ea3y ch\u1ed3i. C. Trinh sinh, ph\u00e2n m\u1ea3nh. D. Ph\u00e2n m\u1ea3nh, n\u1ea3y ch\u1ed3i. Nh\u1eefng h\u00ecnh th\u1ee9c sinh s\u1ea3n v\u00f4 t\u00ednh ch\u1ec9 g\u1eb7p \u1edf \u0111\u1ed9ng v\u1eadt kh\u00f4ng x\u01b0\u01a1ng s\u1ed1ng l\u00e0 ph\u00e2n m\u1ea3nh v\u00e0 n\u1ea3y ch\u1ed3i. Ph\u00e2n \u0111\u00f4i g\u1eb7p \u1edf sinh v\u1eadt \u0111\u01a1n b\u00e0o. Trinh sinh g\u1eb7p \u1edf ong, c\u00e1, b\u00f2 s\u00e1t, \u2026 15. Gh\u00e9p t\u1ee7y gi\u1eefa hai anh em sinh \u0111\u00f4i c\u00f9ng tr\u1ee9ng c\u00f3 th\u1ec3 coi l\u00e0 B. tr\u01b0\u1eddng h\u1ee3p n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 gh\u00e9p m\u00f4. A. \u0111\u1ed3ng gh\u00e9p, v\u00ec \u0111\u00e2y l\u00e0 hai c\u01a1 th\u1ec3 anh em sinh \u0111\u00f4i c\u00f9ng D. d\u1ecb gh\u00e9p, v\u00ec hai c\u01a1 th\u1ec3 c\u00f3 th\u1ec3 kh\u00f4ng c\u00f9ng nh\u00f3m m\u00e1u. tr\u1ee9ng. C. t\u1ef1 gh\u00e9p v\u00ec hai c\u01a1 th\u1ec3 c\u00f3 ki\u1ec3u gen ho\u00e0n to\u00e0n gi\u1ed1ng nhau. Gh\u00e9p t\u1ee7y gi\u1eefa hai anh em sinh \u0111\u00f4i c\u00f9ng tr\u1ee9ng c\u00f3 th\u1ec3 coi l\u00e0 \u0111\u1ed3ng gh\u00e9p, v\u00ec \u0111\u00e2y l\u00e0 hai c\u01a1 th\u1ec3 anh em sinh \u0111\u00f4i c\u00f9ng tr\u1ee9ng. Trang 3\/3","\u0110\u00c1P \u00c1N B\u00c0I T\u1eacP B\u00c0I 8: SINH S\u1ea2N H\u1eeeU T\u00cdNH \u1ede SINH V\u1eacT H\u1ecdc t\u1ed1t Khoa h\u1ecdc t\u1ef1 nhi\u00ean 7 1. \u00dd ngh\u0129a v\u1ec1 m\u1eb7t di truy\u1ec1n c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng th\u1ee5 tinh k\u00e9p \u1edf th\u1ef1c v\u1eadt h\u1ea1t k\u00edn l\u00e0 A. h\u00ecnh th\u00e0nh n\u1ed9i nh\u0169 cung c\u1ea5p ch\u1ea5t dinh d\u01b0\u1ee1ng cho c\u00e2y B. h\u00ecnh th\u00e0nh n\u1ed9i nh\u0169 ch\u1ee9a c\u00e1c t\u1ebf b\u00e0o \u0111\u1ed9t bi\u1ebfn tam b\u1ed9i. ph\u00e1t tri\u1ec3n. C. cung c\u1ea5p ch\u1ea5t dinh d\u01b0\u1ee1ng cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a ph\u00f4i v\u00e0 D. ti\u1ebft ki\u1ec7m v\u1eadt li\u1ec7u di truy\u1ec1n (do s\u1eed d\u1ee5ng c\u1ea3 2 tinh t\u1eed \u0111\u1ec3 th\u1eddi k\u00ec \u0111\u1ea7u c\u1ee7a c\u00e1 th\u1ec3 m\u1edbi. th\u1ee5 tinh). Th\u1ee5 tinh k\u00e9p \u1edf th\u1ef1c v\u1eadt: Hai tinh t\u1eed tham gia v\u00e0o th\u1ee5 tinh, 1 tinh t\u1eed k\u1ebft h\u1ee3p v\u1edbi tr\u1ee9ng \u0111\u1ec3 t\u1ea1o h\u1ee3p t\u1eed c\u00f2n 1 tinh t\u1eed k\u1ebft h\u1ee3p v\u1edbi nh\u00e2n c\u1ef1c (2n) h\u00ecnh th\u00e0nh n\u1ed9i nh\u0169 (3n). X\u00e9t c\u00e1c ph\u01b0\u01a1ng \u00e1n: A \u0111\u00fang, Hi\u1ec7n t\u01b0\u1ee3ng th\u1ee5 tinh k\u00e9p s\u1eed d\u1ee5ng 2 tinh t\u1eed ti\u1ebft ki\u1ec7m v\u1eadt li\u1ec7u di truy\u1ec1n. B sai, th\u1ee5 tinh k\u00e9p kh\u00f4ng cung c\u1ea5p dinh d\u01b0\u1ee1ng cho ph\u00f4i m\u00e0 ch\u1ec9 h\u00ecnh th\u00e0nh n\u00ean b\u1ed9 ph\u1eadn d\u1ef1 tr\u1eef ch\u1ea5t dinh d\u01b0\u1ee1ng sau n\u00e0y s\u1ebd cung c\u1ea5p cho ph\u00f4i. C sai, v\u00ec m\u1ed9t s\u1ed1 lo\u00e0i, n\u1ed9i nh\u0169 ch\u1ec9 l\u00e0 1 l\u1edbp m\u00e0ng m\u1ecfng, ch\u1ea5t dinh d\u01b0\u1ee1ng t\u00edch l\u0169y trong 2 l\u00e1 m\u1ea7m. D sai, c\u00e1c t\u1ebf b\u00e0o n\u1ed9i nh\u0169 3n kh\u00f4ng ph\u1ea3i l\u00e0 do \u0111\u1ed9t bi\u1ebfn m\u00e0 l\u00e0 k\u1ebft h\u1ee3p gi\u1eefa tinh t\u1eed v\u1edbi nh\u00e2n c\u1ef1c. 2. M\u1ed9t s\u1ed1 lo\u00e0i c\u00e1 (c\u00e1 m\u1eadp) c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng \u0111\u1ebb tr\u1ee9ng thai. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y c\u01a1 th\u1ec3 m\u1eb9 c\u00f3 vai tr\u00f2 ch\u00ednh l\u00e0 g\u00ec? A. B\u1ea3o v\u1ec7 ph\u00f4i kh\u1ecfi c\u00e1c y\u1ebfu t\u1ed1 b\u1ea5t l\u1ee3i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. B. Ch\u1ecdn l\u1ecdc c\u00e1c c\u00e1 th\u1ec3 kho\u1ebb m\u1ea1nh. C. Cung c\u1ea5p nhi\u1ec7t \u0111\u1ed9 cho ph\u00f4i ph\u00e1t tri\u1ec3n. D. Cung c\u1ea5p ch\u1ea5t dinh d\u01b0\u1ee1ng cho ph\u00f4i ph\u00e1t tri\u1ec3n. \u1ede c\u00e1c lo\u00e0i c\u00e1 \u0111\u1ebb con th\u00ec tr\u1ee9ng \u0111\u01b0\u1ee3c th\u1ee5 tinh n\u1eb1m l\u1ea1i trong \u1ed1ng d\u1eabn tr\u1ee9ng, sinh tr\u01b0\u1edfng nh\u1edd ch\u1ea5t dinh d\u01b0\u1ee1ng trong no\u00e3n ho\u00e0ng, khi tr\u1ee9ng n\u1edf c\u00e1 m\u1eb9 \u0111\u1ebb con ra ngo\u00e0i. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y c\u00e1 th\u1ec3 m\u1eb9 cung c\u1ea5p nhi\u1ec7t \u0111\u1ed9 cho ph\u00f4i ph\u00e1t tri\u1ec3n. 3. C\u00e1c \u0111\u1ed9ng v\u1eadt l\u01b0\u1ee1ng t\u00ednh sinh s\u1ea3n theo ki\u1ec3u giao ph\u1ed1i th\u00ec duy tr\u00ec c\u1ea3 c\u01a1 quan sinh d\u1ee5c \u0111\u1ef1c v\u00e0 c\u01a1 quan sinh d\u1ee5c c\u00e1i c\u00f3 l\u1ee3i g\u00ec? A. C\u00f3 th\u1ec3 chuy\u1ec3n sang t\u1ef1 th\u1ee5 khi c\u1ea7n thi\u1ebft. B. V\u1eabn \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 sinh s\u1ea3n khi m\u1eadt \u0111\u1ed9 qu\u1ea7n th\u1ec3 th\u1ea5p. C. Kh\u00f4ng c\u00f3 l\u1ee3i c\u0169ng kh\u00f4ng c\u00f3 h\u1ea1i. D. M\u1ed7i c\u01a1 th\u1ec3 \u0111\u1ec1u c\u00f3 th\u1ec3 sinh ra h\u1eadu th\u1ebf \u0111\u1ec3 duy tr\u00ec s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a lo\u00e0i. C\u00e1c \u0111\u1ed9ng v\u1eadt l\u01b0\u1ee1ng t\u00ednh tuy c\u00f3 c\u1ea3 2 c\u01a1 quan sinh d\u1ee5c \u0111\u1ef1c v\u00e0 c\u00e1i nh\u01b0ng th\u01b0\u1eddng th\u1ee5 tinh ch\u00e9o, trong \u0111i\u1ec1u ki\u1ec7n b\u1ea5t l\u1ee3i kh\u00f3 g\u1eb7p \u0111\u01b0\u1ee3c c\u01a1 th\u1ec3 kh\u00e1c \u0111\u1ec3 th\u1ee5 tinh ch\u00e9o th\u00ec ch\u00fang v\u1eabn c\u00f3 th\u1ec3 t\u1ef1 th\u1ee5 tinh t\u1ea1o th\u1ebf h\u1ec7 sau. 4. C\u1ea5u t\u1ea1o 1 hoa l\u01b0\u1ee1ng t\u00ednh g\u1ed3m c\u00e1c b\u1ed9 ph\u1eadn B. nh\u1ecb, c\u00e1nh hoa v\u00e0 \u0111\u00e0i hoa. A. b\u1ea7u nhu\u1ef5 v\u00e0 c\u00e1nh hoa. D. b\u1ea7u nhu\u1ef5, \u0111\u00e0i hoa, c\u00e1nh hoa, nh\u1ecb v\u00e0 nhu\u1ef5. C. c\u00e1nh hoa v\u00e0 \u0111\u00e0i hoa. C\u1ea5u t\u1ea1o 1 hoa l\u01b0\u1ee1ng t\u00ednh g\u1ed3m c\u00e1c b\u1ed9 ph\u1eadn: b\u1ea7u nhu\u1ef5, \u0111\u00e0i hoa, c\u00e1nh hoa, nh\u1ecb v\u00e0 nhu\u1ef5. 5. Hoa th\u1ee5 ph\u1ea5n nh\u1edd s\u00e2u b\u1ecd c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt l\u00e0 g\u00ec? A. Tr\u00e0ng l\u1edbn v\u00e0 c\u00f3 m\u00e0u s\u1eafc r\u1ea5t s\u1eb7c s\u1ee1. B. Kh\u00f4ng c\u00f3 h\u01b0\u01a1ng th\u01a1m. C. V\u00f2i nh\u1ecb r\u1ea5t d\u00e0i. D. Th\u01b0\u1eddng kh\u00f4ng m\u1ecdc th\u00e0nh c\u1ee5m. Hoa th\u1ee5 ph\u1ea5n nh\u1edd s\u00e2u b\u1ecd ph\u1ea3i c\u00f3 m\u00f9i th\u01a1m, m\u00e0u s\u1eafc s\u1eb7c s\u1ee1, tr\u00e0ng l\u1edbn \u0111\u1ec3 thu h\u00fat c\u00f4n tr\u00f9ng. VD: Hoa b\u01b0\u1edfi, hoa b\u00ed ng\u00f4, \u2026. 6. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n h\u1eefu t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt g\u1ed3m c\u00e1c giai \u0111o\u1ea1n? B. Th\u1ee5 tinh v\u00e0 ph\u00e1t tri\u1ec3n ph\u00f4i thai. A. H\u00ecnh th\u00e0nh giao t\u1eed, th\u1ee5 t\u00ednh, t\u1ea1o th\u00e0nh h\u1ee3p t\u1eed. D. H\u00ecnh th\u00e0nh giao t\u1eed, th\u1ee5 tinh, ph\u00e1t tri\u1ec3n ph\u00f4i thai. C. H\u00ecnh th\u00e0nh giao t\u1eed v\u00e0 th\u1ee5 tinh. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n h\u1eefu t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt g\u1ed3m 3 giai \u0111o\u1ea1n: h\u00ecnh th\u00e0nh giao t\u1eed, th\u1ee5 tinh, ph\u00e1t tri\u1ec3n ph\u00f4i thai. 7. V\u00ec sao sinh s\u1ea3n theo ki\u1ec3u giao ph\u1ed1i ti\u1ebfn ho\u00e1 h\u01a1n sinh s\u1ea3n v\u00f4 t\u00ednh? Trang 1\/3","A. V\u00ec th\u1ec3 h\u1ec7 sau c\u00f3 s\u1ef1 \u0111\u1ed3ng nh\u1ea5t v\u1ec1 m\u1eb7t di truy\u1ec1n t\u1ea1o ra B. V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n kh\u1ea3 n\u0103ng th\u00edch nghi \u0111\u1ed3ng lo\u1ea1t v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m tr\u01b0\u1eddng. xu\u1ea5t hi\u1ec7n nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p c\u00f3 l\u1ee3i th\u00edch nghi v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. C. V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n D. V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m xu\u1ea5t hi\u1ec7n nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi gi\u1ea3m xu\u1ea5t hi\u1ec7n nhi\u00eau bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p c\u00f3 h\u1ea1i v\u00e0 t\u0103ng c\u01b0\u1eddng v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. kh\u1ea3 n\u0103ng th\u00edch nghi v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. Sinh s\u1ea3n theo ki\u1ec3u giao ph\u1ed1i (H\u1eefu t\u00ednh) ti\u1ebfn h\u00f3a h\u01a1n sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0: V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m xu\u1ea5t hi\u1ec7n nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. \u00dd B sai v\u00ec c\u00e1c c\u00e1 th\u1ec3 sinh ra t\u1eeb sinh s\u1ea3n h\u1eefu t\u00ednh c\u00f3 ki\u1ec3u h\u00ecnh v\u00e0 ki\u1ec3u gen kh\u00e1c nhau. \u00dd C sai v\u00ec l\u00e0m t\u0103ng bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p. \u00dd D sai v\u00ec kh\u00f4ng ph\u1ea3i bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p n\u00e0o c\u0169ng c\u00f3 l\u1ee3i. 8. B\u1ea3n ch\u1ea5t c\u1ee7a th\u1ee5 tinh l\u00e0 g\u00ec? B. B\u1ea3n ch\u1ea5t c\u1ee7a th\u1ee5 tinh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng c\u1ee7a A. B\u1ea3n ch\u1ea5t c\u1ee7a th\u1ee5 tinh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng c\u1ee7a con \u0111\u1ef1c v\u00e0 tr\u1ee9ng c\u1ee7a con c\u00e1i \u0111\u1ec3 t\u1ea1o th\u00e0nh th\u1ec3 c\u1ef1c. con \u0111\u1ef1c v\u00e0 th\u1ec3 c\u1ef1c c\u1ee7a con c\u00e1i \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1 th\u1ec3 m\u1edbi. D. B\u1ea3n ch\u1ea5t c\u1ee7a th\u1ee5 tinh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p t\u1ebf b\u00e0o sinh tinh c\u1ee7a con \u0111\u1ef1c v\u00e0 t\u1ebf b\u00e0o sinh tr\u1ee9ng c\u1ee7a con c\u00e1i \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1 C. B\u1ea3n ch\u1ea5t c\u1ee7a th\u1ee5 tinh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng c\u1ee7a th\u1ec3 m\u1edbi. con \u0111\u1ef1c v\u00e0 tr\u1ee9ng c\u1ee7a con c\u00e1i \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1 th\u1ec3 m\u1edbi. B\u1ea3n ch\u1ea5t c\u1ee7a th\u1ee5 tinh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa tinh tr\u00f9ng c\u1ee7a con \u0111\u1ef1c v\u00e0 tr\u1ee9ng c\u1ee7a con c\u00e1i \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1 th\u1ec3 m\u1edbi. 9. Trong sinh s\u1ea3n h\u1eefu t\u00ednh c\u01a1 th\u1ec3 m\u1edbi sinh ra t\u1eeb A. h\u1ee3p t\u1eed. B. giao t\u1eed. C. ph\u00f4i. D. b\u00e0o t\u1eed. C\u01a1 th\u1ec3 m\u1edbi l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ee3p t\u1eed. 10. Sau khi h\u1ea1t ph\u1ea5n r\u01a1i v\u00e0o \u0111\u1ea7u nh\u1ee5y th\u00ec A. h\u1ea1t ph\u1ea5n s\u1ebd B. h\u1ea1t ph\u1ea5n \u0111\u1ee3i ch\u00edn h\u1eb3n s\u1ebd tham gia th\u1ee5 tinh. x\u00e2m nh\u1eadp v\u00e0o \u0111\u1ea7u nh\u1ee5y. D. h\u1ea1t ph\u1ea5n s\u1ebd h\u00fat n\u01b0\u1edbc v\u00e0 n\u1ea3y m\u1ea7m. C. h\u1ea1t ph\u1ea5n s\u1ebd kh\u00f4 \u0111i. H\u1ea1t ph\u1ea5n r\u01a1i v\u00e0o \u0111\u1ea7u nh\u1ee5y sau \u0111\u00f3 h\u00fat n\u01b0\u1edbc cho tr\u01b0\u01a1ng l\u00ean v\u00e0 n\u1ea3y m\u1ea7m g\u1ecdi l\u00e0 s\u1ef1 th\u1ee5 ph\u1ea5n. 11. M\u1ed9t c\u01a1 th\u1ec3 v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed \u0111\u1ef1c, v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed c\u00e1i th\u00ec g\u1ecdi l\u00e0 A. c\u01a1 th\u1ec3 l\u01b0\u1ee1ng t\u00ednh. B. th\u1ec3 song nh\u1ecb b\u1ed9i. C. th\u1ec3 l\u01b0\u1ee1ng c\u1ef1c. D. c\u01a1 th\u1ec3 l\u01b0\u1ee1ng b\u1ed9i. M\u1ed9t c\u01a1 th\u1ec3 v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed \u0111\u1ef1c, v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed c\u00e1i l\u00e0 c\u01a1 th\u1ec3 l\u01b0\u1ee1ng t\u00ednh. 12. H\u01b0\u1edbng ti\u1ebfn ho\u00e1 v\u1ec1 sinh s\u1ea3n c\u1ee7a \u0111\u1ed9ng v\u1eadt l\u00e0 B. t\u1eeb v\u00f4 t\u00ednh \u0111\u1ebfn h\u1eefu t\u00ednh, t\u1eeb th\u1ee5 tinh trong \u0111\u1ebfn th\u1ee5 tinh A. t\u1eeb h\u1eefu t\u00ednh \u0111\u1ebfn v\u00f4 t\u00ednh, t\u1eeb th\u1ee5 tinh ngo\u00e0i \u0111\u1ebfn th\u1ee5 tinh ngo\u00e0i, t\u1eeb \u0111\u1ebb con \u0111\u1ebfn \u0111\u1ebb tr\u1ee9ng. trong, t\u1eeb \u0111\u1ebb tr\u1ee9ng \u0111\u1ebfn \u0111\u1ebb con. D. t\u1eeb v\u00f4 t\u00ednh \u0111\u1ebfn h\u1eefu t\u00ednh, t\u1eeb th\u1ee5 tinh ngo\u00e0i \u0111\u1ebfn th\u1ee5 tinh C. t\u1eeb v\u00f4 t\u00ednh \u0111\u1ebfn h\u1eefu t\u00ednh, t\u1eeb th\u1ee5 tinh trong \u0111\u1ebfn th\u1ee5 tinh trong, t\u1eeb \u0111\u1ebb tr\u1ee9ng \u0111\u1ebfn \u0111\u1ebb con. ngo\u00e0i, t\u1eeb \u0111\u1ebb tr\u1ee9ng \u0111\u1ebfn \u0111\u1ebb con. Chi\u1ec1u h\u01b0\u1edbng ti\u1ebfn h\u00f3a c\u1ee7a sinh s\u1ea3n \u1edf \u0111\u1ed9ng v\u1eadt \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n: T\u1eeb v\u00f4 t\u00ednh \u0111\u1ebfn h\u1eefu t\u00ednh. T\u1eeb th\u1ee5 tinh ngo\u00e0i \u0111\u1ebfn th\u1ee5 tinh trong. T\u1eeb \u0111\u1ebb tr\u1ee9ng t\u1edbi \u0111\u1ebb con. 13. H\u00ecnh th\u1ee9c sinh s\u1ea3n c\u00f3 s\u1ef1 h\u1ee3p nh\u1ea5t c\u1ee7a giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i t\u1ea1o n\u00ean h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi l\u00e0 kh\u00e1i ni\u1ec7m v\u1ec1 A. sinh s\u1ea3n b\u1eb1ng b\u00e0o t\u1eed. B. sinh s\u1ea3n v\u00f4 t\u00ednh. C. sinh s\u1ea3n h\u1eefu t\u00ednh. D. sinh s\u1ea3n b\u1eb1ng nu\u00f4i c\u1ea5y m\u00f4 t\u1ebf b\u00e0o. Sinh s\u1ea3n h\u1eefu t\u00ednh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p ng\u1eabu nhi\u00ean gi\u1eefa hai giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i t\u1ea1o n\u00ean h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. Trang 2\/3","14. Giao t\u1eed c\u00e1i \u1edf th\u1ef1c v\u1eadt \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 g\u00ec? A. H\u1ee3p t\u1eed. B. Ph\u00f4i. C. H\u1ea1t ph\u1ea5n. D. No\u00e3n c\u1ea7u. Giao t\u1eed c\u00e1i \u1edf th\u1ef1c v\u1eadt \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 no\u00e3n c\u1ea7u b\u00ean trong ch\u1ee9a t\u00fai ph\u00f4i. 15. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0o kh\u00f4ng ph\u1ea3i l\u00e0 \u01b0u th\u1ebf c\u1ee7a sinh s\u1ea3n h\u1eefu t\u00ednh so v\u1edbi sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf th\u1ef1c v\u1eadt? A. Duy tr\u00ec \u1ed5n \u0111\u1ecbnh nh\u1eefng t\u00ednh tr\u1ea1ng t\u1ed1t v\u1ec1 m\u1eb7t di truy\u1ec1n. B. T\u1ea1o \u0111\u01b0\u1ee3c nhi\u1ec1u bi\u1ebf d\u1ecb l\u00e0m nguy\u00ean li\u1ec7u cho qu\u00e1 tr\u00ecnh ch\u1ecdn gi\u1ed1ng v\u00e0 ti\u1ebfn ho\u00e1. C. C\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi v\u1edbi nh\u1eefng \u0111i\u1ec1u ki\u1ec7n m\u00f4i D. L\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n ph\u1ed5 bi\u1ebfn. tr\u01b0\u1eddng bi\u1ebfn \u0111\u1ed5i. Sinh s\u1ea3n h\u1eefu t\u00ednh c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p l\u1ea1i v\u1eadt ch\u1ea5t di truy\u1ec1n n\u00ean t\u1ea1o \u0111\u01b0\u1ee3c nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p l\u00e0m nguy\u00ean li\u1ec7u cho ch\u1ecdn gi\u1ed1ng v\u00e0 ti\u1ebfn h\u00f3a, \u0111\u1eddi con c\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi t\u1ed1t v\u1edbi m\u00f4i tr\u01b0\u1eddng. Nh\u01b0ng sinh s\u1ea3n h\u1eefu t\u00ednh kh\u00f4ng duy tr\u00ec \u0111\u01b0\u1ee3c \u1ed5n \u0111\u1ecbnh c\u00e1c t\u00ednh tr\u1ea1ng t\u1ed1t nh\u01b0 sinh s\u1ea3n v\u00f4 t\u00ednh. Trang 3\/3","\u0110\u00c1P \u00c1N B\u00c0I T\u1eacP B\u00c0I 9: C\u00c1C Y\u1ebeU T\u1ed0 \u1ea2NH H\u01af\u1edeNG \u0110\u1ebeN SINH S\u1ea2N V\u00c0 \u0110I\u1ec0U KHI\u1ec2N SINH S\u1ea2N \u1ede SINH V\u1eacT H\u1ecdc t\u1ed1t Khoa h\u1ecdc t\u1ef1 nhi\u00ean 7 1. Bi\u1ec7n ph\u00e1p c\u00f3 t\u00ednh ph\u1ed5 bi\u1ebfn v\u00e0 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n t\u1ef7 l\u1ec7 \u0111\u1ef1c c\u00e1i l\u00e0 A. d\u00f9ng c\u00e1c nh\u00e2n t\u1ed1 m\u00f4i tr\u01b0\u1eddng ngo\u00e0i t\u00e1c \u0111\u1ed9ng. B. ph\u00e2n l\u1eadp c\u00e1c lo\u1ea1i giao t\u1eed mang NST X v\u00e0 NST Y r\u1ed3i sau \u0111\u00f3 m\u1edbi cho th\u1ee5 tinh. C. thay \u0111\u1ed5i c\u1eb7p NST gi\u1edbi t\u00ednh \u1edf h\u1ee3p t\u1eed. D. d\u00f9ng c\u00e1c nh\u00e2n t\u1ed1 m\u00f4i tr\u01b0\u1eddng trong t\u00e1c \u0111\u1ed9ng. -Bi\u1ec7n ph\u00e1p c\u00f3 t\u00ednh ph\u1ed5 bi\u1ebfn v\u00e0 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n t\u1ef7 l\u1ec7 \u0111\u1ef1c c\u00e1i l\u00e0 ph\u00e2n l\u1eadp c\u00e1c lo\u1ea1i giao t\u1eed mang NST X v\u00e0 NST Y r\u1ed3i sau \u0111\u00f3 m\u1edbi cho th\u1ee5 tinh. - Mu\u1ed1n t\u0103ng nhanh \u0111\u00e0n gia s\u00fac v\u00e0 gia c\u1ea7m c\u1ea7n t\u0103ng nhi\u1ec1u con c\u00e1i. Mu\u1ed1n c\u00f3 nhi\u1ec1u tr\u1ee9ng, s\u1eefa th\u00ec c\u1ea7n nhi\u1ec1u con c\u00e1i. Mu\u1ed1n c\u00f3 nhi\u1ec1u th\u1ecbt th\u00ec c\u1ea7n nhi\u1ec1u con \u0111\u1ef1c. Mu\u1ed1n l\u1ea5y s\u1ea3n ph\u1ea9m ch\u1ec9 c\u00f3 \u1edf con \u0111\u1ef1c nh\u01b0 nhung h\u01b0\u01a1u, l\u00f4ng c\u1eebu, t\u01a1 t\u1eb1m th\u00ec c\u1ea7n t\u1ea1o ra nhi\u1ec1u con \u0111\u1ef1c. -S\u1eed d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nh\u01b0 l\u1ecdc, li t\u00e2m, \u0111i\u1ec7n di \u0111\u1ec3 t\u00e1ch giao t\u1eed th\u00e0nh 2 lo\u1ea1i. Tu\u1ef3 theo nhu c\u1ea7u v\u1ec1 \u0111\u1ef1c hay c\u00e1i \u0111\u1ec3 ch\u1ecdn ra m\u1ed9t lo\u1ea1i tinh tr\u00f9ng cho th\u1ee5 tinh v\u1edbi tr\u1ee9ng. 2. Hormone n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh s\u1ea3n c\u1ee7a th\u1ef1c v\u1eadt? A. Florigen. B. Testosterone. C. FSH. D. LH. L\u00e0 hormone k\u00edch th\u00edch ra hoa, h\u1ee3p ch\u1ea5t c\u1ee7a Gibberellin (k\u00edch th\u00edch sinh tr\u01b0\u1edfng c\u1ee7a \u0111\u1ebf hoa) v\u00e0 Antezin (k\u00edch th\u00edch s\u1ef1 ra m\u1ea7m hoa - ch\u1ea5t gi\u1ea3 thi\u1ebft). 3. Bi\u1ec7n ph\u00e1p hi\u1ec7u qu\u1ea3 nh\u1ea5t \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t th\u1ee5 tinh l\u00e0 A. s\u1eed d\u1ee5ng hoocm\u00f4n ho\u1eb7c ch\u1ea5t k\u00edch t\u1ed5ng h\u1ee3p. B. th\u1ee5 tinh nh\u00e2n t\u1ea1o. C. nu\u00f4i c\u1ea5y ph\u00f4i. D. thay \u0111\u1ed5i c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng. Th\u1ee5 tinh nh\u00e2n t\u1ea1o c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m t\u0103ng hi\u1ec7u qu\u1ea3 th\u1ee5 tinh, c\u00f3 th\u1ec3 di\u1ec5n ra b\u00ean trong ho\u1eb7c b\u00ean ngo\u00e0i c\u01a1 th\u1ec3. Th\u1ee5 tinh nh\u00e2n t\u1ea1o c\u00f3 th\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t 80-90% so v\u1edbi 40% khi th\u1ee5 tinh trong \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean. 4. M\u1ee5c \u0111\u00edch c\u1ee7a vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n gi\u1edbi t\u00ednh c\u1ee7a \u0111\u00e0n con trong ch\u0103n nu\u00f4i l\u00e0 A. ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u s\u1ea3n xu\u1ea5t. B. l\u00e0m gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng con \u0111\u1ef1c. C. l\u00e0m c\u00e2n b\u1eb1ng t\u1ef7 l\u1ec7 \u0111\u1ef1c c\u00e1i. D. l\u00e0m gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng con c\u00e1i. M\u1ee5c \u0111\u00edch c\u1ee7a vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n gi\u1edbi t\u00ednh c\u1ee7a \u0111\u00e0n con trong ch\u0103n nu\u00f4i l\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u s\u1ea3n xu\u1ea5t. V\u00ec \u0111\u1eb7c t\u00ednh c\u1ee7a con \u0111\u1ef1c v\u00e0 con c\u00e1i kh\u00e1c nhau v\u1ec1 kh\u1ea3 n\u0103ng s\u1ea3n xu\u1ea5t v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m n\u00ean ng\u01b0\u1eddi ta \u01b0u ti\u00ean ch\u1ecdn con \u0111\u1ef1c hay con c\u00e1i t\u00f9y v\u00e0o nhu c\u1ea7u s\u1ea3n xu\u1ea5t c\u1ea7n thu lo\u1ea1i s\u1ea3n ph\u1ea9m n\u00e0o. V\u00ed d\u1ee5: C\u1ea7n thu tr\u1ee9ng v\u00e0 s\u1eefa th\u00ec ng\u01b0\u1eddi ta ch\u1ecdn con c\u00e1i; c\u1ea7n s\u1ee9c k\u00e9o, th\u1ecbt ng\u01b0\u1eddi ta ch\u1ecdn con \u0111\u1ef1c, ... 5. Ng\u01b0\u1eddi ta \u00e1p d\u1ee5ng bi\u1ec7n ph\u00e1p th\u1ee5 tinh nh\u00e2n t\u1ea1o \u0111\u1ed1i v\u1edbi c\u00e1 m\u00e8, c\u00e1 tr\u1eafm c\u00f3 trong ao nu\u00f4i. Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai? A. Vi\u1ec7c l\u00e0m n\u00e0y nh\u1eb1m m\u1ee5c \u0111\u00edch lai t\u1ea1o 2 gi\u1ed1ng c\u00e0 m\u00e8 v\u00e0 B. Vi\u1ec7c l\u00e0m n\u00e0y nh\u1eb1m m\u1ee5c \u0111\u00edch t\u0103ng hi\u1ec7u su\u1ea5t qu\u00e1 tr\u00ecnh c\u00e1 tr\u1eafm c\u1ecf v\u1edbi nhau. th\u1ee5 tinh. C. Do c\u00e1 m\u00e8, c\u00e1 tr\u1eafm kh\u00f4ng \u0111\u1ebb trong ao nu\u00f4i. D. Vi\u1ec7c l\u00e0m n\u00e0y nh\u1eb1m m\u1ee5c \u0111\u00edch t\u0103ng t\u1ec9 l\u1ec7 s\u1ed1ng s\u00f3t c\u00faa c\u00e1 con sau khi n\u1edf. Ng\u01b0\u1eddi ta \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 do c\u00e1 m\u00e8, c\u00e1 tr\u1eafm c\u1ecf kh\u00f4ng \u0111\u1ebb trong ao nu\u00f4i. \u0110\u1ed3ng th\u1eddi vi\u1ec7c l\u00e0m n\u00e0y c\u0169ng gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t th\u1ee5 tinh, t\u0103ng t\u1ef7 l\u1ec7 s\u1ed1ng s\u00f3t cho c\u00e1c c\u00e1 th\u1ec3 con. V\u00ec khi th\u1ee5 tinh, \u1ea5p n\u1edf nh\u00e2n t\u1ea1o th\u00ec m\u1ee9c \u0111\u1ed9 ph\u1ee5 thu\u1ed9c v\u00e0o m\u00f4i tr\u01b0\u1eddng gi\u1ea3m xu\u1ed1ng. 6. Hoa th\u1ee5 ph\u1ea5n nh\u1edd s\u00e2u b\u1ecd c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt l\u00e0 g\u00ec? B. V\u00f2i nh\u1ecb r\u1ea5t d\u00e0i. A. Th\u01b0\u1eddng kh\u00f4ng m\u1ecdc th\u00e0nh c\u1ee5m. D. Tr\u00e0ng l\u1edbn v\u00e0 c\u00f3 m\u00e0u s\u1eafc r\u1ea5t s\u1eb7c s\u1ee1. C. Kh\u00f4ng c\u00f3 h\u01b0\u01a1ng th\u01a1m. Hoa th\u1ee5 ph\u1ea5n nh\u1edd s\u00e2u b\u1ecd ph\u1ea3i c\u00f3 m\u00f9i th\u01a1m, m\u00e0u s\u1eafc s\u1eb7c s\u1ee1, tr\u00e0ng l\u1edbn \u0111\u1ec3 thu h\u00fat c\u00f4n tr\u00f9ng. Trang 1\/3 V\u00ed d\u1ee5: Hoa b\u01b0\u1edfi, hoa b\u00ed ng\u00f4, ...","7. Cho nh\u1eefng bi\u1ec7n ph\u00e1p sau \u0111\u00e2y: (1) Nu\u00f4i c\u1ea5y ph\u00f4i. (2) Th\u1ee5 tinh nh\u00e2n t\u1ea1o. (3) S\u1eed d\u1ee5ng hormone. (4) Thay \u0111\u1ed5i y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng. (5) S\u1eed d\u1ee5ng ch\u1ea5t k\u00edch th\u00edch t\u1ed5ng h\u1ee3p. Nh\u1eefng bi\u1ec7n ph\u00e1p th\u00fac \u0111\u1ea9y tr\u1ee9ng ch\u00edn nhanh v\u00e0 r\u1ee5ng h\u00e0ng lo\u1ea1t l\u00e0 A. (1), (3), v\u00e0 (5). B. (1), (3) v\u00e0 (4). C. (2), (3) v\u00e0 (4). D. (2), (4) v\u00e0 (5). Nh\u1eefng bi\u1ec7n ph\u00e1p th\u00fac \u0111\u1ea9y tr\u1ee9ng ch\u00edn nhanh v\u00e0 r\u1ee5ng h\u00e0ng lo\u1ea1t l\u00e0 (1), (3) v\u00e0 (5). - Ti\u00eam hoocmon th\u00fac \u0111\u1ea9y s\u1ef1 ch\u00edn v\u00e0 r\u1ee5ng c\u1ee7a nhi\u1ec1u tr\u1ee9ng r\u1ed3i l\u1ea5y c\u00e1c tr\u1ee9ng \u0111\u00f3 ra ngo\u00e0i. Cho c\u00e1c tr\u1ee9ng \u0111\u00f3 th\u1ee5 tinh trong \u1ed1ng nghi\u1ec7m v\u00e0 nu\u00f4i d\u01b0\u1ee1ng c\u00e1c h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n \u0111\u1ebfn m\u1ed9t giai \u0111o\u1ea1n ph\u00f4i nh\u1ea5t \u0111\u1ecbnh. Sau \u0111\u00f3 \u0111em c\u00e1c ph\u00f4i n\u00e0y c\u1ea5y v\u00e0o t\u1eed cung c\u1ee7a con c\u00e1i \u0111\u1ec3 con c\u00e1i mang thai v\u00e0 \u0111\u1ebb con. -Ti\u00eam d\u1ecbch chi\u1ebft t\u1eeb tuy\u1ebfn d\u01b0\u1edbi n\u00e3o c\u1ee7a c\u00e1c lo\u00e0i kh\u00e1c l\u00e0m tr\u1ee9ng ch\u00edn h\u00e0ng lo\u1ea1t, sau \u0111\u00f3 l\u1ea5y tr\u1ee9ng ra v\u00e0 cho th\u1ee5 tinh nh\u00e2n t\u1ea1o b\u00ean ngo\u00e0i c\u01a1 th\u1ec3 r\u1ed3i \u0111em \u1ea5p n\u1edf ra con non. 8. Mu\u1ed1n t\u0103ng nhanh \u0111\u00e0n gia s\u00fac, ng\u01b0\u1eddi ta th\u01b0\u1eddng \u00e1p d\u1ee5ng nh\u1eefng bi\u1ec7n ph\u00e1p n\u00e0o sau \u0111\u00e2y? 1 - T\u0103ng nhi\u1ec1u con \u0111\u1ef1c. 2 - T\u0103ng nhi\u1ec1u con c\u00e1i. 3- B\u1ed1 tr\u00ed s\u1ed1 con \u0111\u1ef1c v\u00e0 con c\u00e1i nh\u01b0 nhau. 4 - T\u00e1ch con non ra kh\u1ecfi con m\u1eb9 s\u1edbm. A. 1, 2, 3. B. 2,4. C. 2, 3, 4. D. 1, 2, 3, 4. Mu\u1ed1n t\u0103ng nhanh \u0111\u00e0n gia s\u00fac, gia c\u1ea7m ng\u01b0\u1eddi ta th\u01b0\u1eddng \u00e1p d\u1ee5ng nh\u1eefng bi\u1ec7n ph\u00e1p: T\u0103ng nhi\u1ec1u con c\u00e1i v\u00e0 t\u00e1ch con non ra kh\u1ecfi m\u1eb9 s\u1edbm. V\u00ec \u1edf gia s\u00fac, gia c\u1ea7m m\u1ed9t con \u0111\u1ef1c c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u sinh s\u1ea3n c\u1ee7a nhi\u1ec1u con c\u00e1i, do \u0111\u00f3 s\u1ed1 l\u01b0\u1ee3ng \u0111\u00e0n con ph\u1ee5 thu\u1ed9c nhi\u1ec1u v\u00e0o s\u1ed1 l\u01b0\u1ee3ng con c\u00e1i h\u01a1n l\u00e0 s\u1ed1 l\u01b0\u1ee3ng con \u0111\u1ef1c. Vi\u1ec7c t\u00e1ch con non ra kh\u1ecfi m\u1eb9 s\u1edbm gi\u00fap con c\u00e1i c\u00f3 th\u1ec3 nhanh ch\u00f3ng quay tr\u1edf l\u1ea1i chu k\u00ec sinh s\u1ea3n m\u1edbi nh\u01b0 v\u1eady s\u1ebd t\u0103ng s\u1ed1 l\u1ee9a \u0111\u1ebb trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh gi\u00fap t\u0103ng nhanh s\u1ed1 l\u01b0\u1ee3ng trong \u0111\u00e0n. 9. Th\u1ee5 ph\u1ea5n l\u00e0 B. s\u1ef1 n\u1ea3y m\u1ea7m c\u1ee7a h\u1ea1t ph\u1ea5n tr\u00ean n\u00fam nhu\u1ef5 A. s\u1ef1 di chuy\u1ec3n c\u1ee7a tinh t\u1eed tr\u00ean \u1ed1ng ph\u1ea5n D. s\u1ef1 k\u00e9o d\u00e0i \u1ed1ng ph\u1ea5n trong v\u00f2i nhu\u1ef5. C. s\u1ef1 r\u01a1i h\u1ea1t ph\u1ea5n v\u00e0o n\u00fam nhu\u1ef5 v\u00e0 n\u1ea3y m\u1ea7m. Th\u1ee5 ph\u1ea5n l\u00e0 qu\u00e1 tr\u00ecnh h\u1ea1t ph\u1ea5n r\u01a1i v\u00e0o \u0111\u1ea7u nh\u1ee5y. 10. Bi\u1ec7n ph\u00e1p n\u00e0o c\u00f3 th\u1ec3 \u0111\u1ea1t sinh s\u1ea3n cao v\u00e0 ch\u1ecdn l\u1ecdc nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m mong mu\u1ed1n? A. Th\u1ee5 tinh nh\u00e2n t\u1ea1o b\u00ean trong c\u01a1 th\u1ec3. B. Th\u1ee5 tinh nh\u00e2n t\u1ea1o b\u00ean ngo\u00e0i c\u01a1 th\u1ec3. C. S\u1eed d\u1ee5ng hormone ho\u1eb7c ch\u1ea5t k\u00edch th\u00edch t\u1ed5ng h\u1ee3p. D. Nu\u00f4i c\u1ea5y ph\u00f4i. Th\u1ee5 tinh nh\u00e2n t\u1ea1o b\u00ean trong c\u01a1 th\u1ec3 c\u00f3 th\u1ec3 \u0111\u1ea1t hi\u1ec7u qu\u1ea3 sinh s\u1ea3n cao v\u00e0 ch\u1ecdn l\u1ecdc \u0111\u01b0\u1ee3c nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m mong mu\u1ed1n \u1edf gi\u1ed1ng \u0111\u1ef1c. 11. \u0110\u00e2u kh\u00f4ng ph\u1ea3i l\u00e0 y\u1ebfu t\u1ed1 b\u00ean ngo\u00e0i \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh s\u1ea3n \u1edf sinh v\u1eadt? A. \u00c1nh s\u00e1ng. B. \u0110\u1ed9 tu\u1ed5i. C. Nhi\u1ec7t \u0111\u1ed9. D. N\u01b0\u1edbc. C\u00f3 nh\u1eefng y\u1ebfu t\u1ed1 b\u00ean ngo\u00e0i (m\u00f4i tr\u01b0\u1eddng) ch\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh s\u1ea3n \u1edf sinh v\u1eadt l\u00e0: Nhi\u1ec7t \u0111\u1ed9, \u00e1nh s\u00e1ng, n\u01b0\u1edbc - \u0111\u1ed9 \u1ea9m v\u00e0 ch\u1ea5t dinh d\u01b0\u1ee1ng. \u0110\u1ed9 tu\u1ed5i thu\u1ed9c nh\u00f3m y\u1ebfu t\u1ed1 b\u00ean trong c\u01a1 th\u1ec3 sinh v\u1eadt. 12. \u1ede ng\u01b0\u1eddi, c\u1ea5m x\u00e1c \u0111\u1ecbnh gi\u1edbi t\u00ednh thai nhi v\u00ec B. t\u00e2m l\u00fd c\u1ee7a ng\u01b0\u1eddi th\u00e2n mu\u1ed1n bi\u1ebft tr\u01b0\u1edbc con trai hay con A. s\u1ee3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a thai nhi. g\u00e1i. C. s\u1ee3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00e2m l\u00fd c\u1ee7a ng\u01b0\u1eddi m\u1eb9. D. \u0111\u1ecbnh ki\u1ebfn tr\u1ecdng nam khinh n\u1eef d\u1eabn \u0111\u1ebfn h\u00e0nh vi l\u00e0m thay \u0111\u1ed5i t\u1ec9 l\u1ec7 nam n\u1eef. \u1ede ng\u01b0\u1eddi, c\u1ea5m x\u00e1c \u0111\u1ecbnh gi\u1edbi t\u00ednh thai nhi v\u00ec \u0111\u1ecbnh ki\u1ebfn tr\u1ecdng nam khinh n\u1eef d\u1eabn \u0111\u1ebfn h\u00e0nh vi l\u00e0m thay \u0111\u1ed5i t\u1ec9 l\u1ec7 nam n\u1eef. 13. D\u1ef1a v\u00e0o hormone v\u00e0 \u2026, con ng\u01b0\u1eddi \u0111\u00e3 ch\u1ee7 \u0111\u1ed9ng \u0111i\u1ec1u khi\u1ec3n qu\u00e1 tr\u00ecnh sinh s\u1ea3n. Cho ph\u00f9 h\u1ee3p v\u1edbi m\u1ee5c \u0111\u00edch tr\u1ed3ng tr\u1ecdt v\u00e0 ch\u0103n nu\u00f4i. N\u1ed9i dung c\u00f2n thi\u1ebfu \u1edf ch\u1ed7 tr\u1ed1ng l\u00e0 Trang 2\/3","A. \u0111\u1ed9 tu\u1ed5i. B. c\u00e1c y\u1ebfu t\u1ed1 b\u00ean trong c\u01a1 th\u1ec3. C. c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng. D. sinh l\u00fd. D\u1ef1a v\u00e0o hormone v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng, con ng\u01b0\u1eddi \u0111\u00e3 ch\u1ee7 \u0111\u1ed9ng \u0111i\u1ec1u khi\u1ec3n qu\u00e1 tr\u00ecnh sinh s\u1ea3n. Cho ph\u00f9 h\u1ee3p v\u1edbi m\u1ee5c \u0111\u00edch tr\u1ed3ng tr\u1ecdt v\u00e0 ch\u0103n nu\u00f4i. 14. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n di\u1ec5n ra \u0111\u1ecbnh k\u00ec v\u00e0 \u0111i\u1ec1u ho\u00e0 \u1edf m\u1ed7i lo\u00e0i l\u00e0 do y\u1ebfu t\u1ed1 A. ch\u1ea5t dinh d\u01b0\u1ee1ng. B. \u00e1nh s\u00e1ng. C. hormone. D. nhi\u1ec7t \u0111\u1ed9. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n di\u1ec5n ra \u0111\u1ecbnh k\u00ec v\u00e0 \u0111i\u1ec1u ho\u00e0 \u1edf m\u1ed7i lo\u00e0i l\u00e0 do hormone \u0111i\u1ec1u ho\u00e0 sinh s\u1ea3n. 15. Cho c\u00e1c y\u1ebfu t\u1ed1 sau: 1. H\u1ec7 th\u1ea7n kinh. 2. C\u00e1c nh\u00e2n t\u1ed1 b\u00ean trong c\u01a1 th\u1ec3. 3. C\u00e1c nh\u00e2n t\u1ed1 b\u00ean ngo\u00e0i c\u01a1 th\u1ec3. 4. H\u1ec7 n\u1ed9i ti\u1ebft. 5. H\u1ec7 \u0111\u1ec7m. C\u00f3 bao nhi\u00eau y\u1ebfu t\u1ed1 c\u00f3 \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn qu\u00e1 tr\u00ecnh \u0111i\u1ec1u h\u00f2a sinh tinh v\u00e0 sinh tr\u1ee9ng? A. 1. B. 4. C. 2. D. 3. B\u1ed1n y\u1ebfu t\u1ed1 1, 2, 3, 4 \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh \u0111i\u1ec1u h\u00f2a sinh tinh v\u00e0 sinh tr\u1ee9ng. Trang 3\/3","\u0110\u00c1P \u00c1N B\u00c0I T\u1eacP B\u00c0I T\u1eacPT\u1ef0 LU\u1eacN CH\u1ee6 \u0110\u1ec0: SINH TR\u01af\u1edeNG V\u00c0 PH\u00c1T TRI\u1ec2N \u1ede SINH V\u1eacT Khoa h\u1ecdc t\u1ef1 nhi\u00ean 7 1. Tr\u1eddi r\u00e9t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng, ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt h\u1eb1ng nhi\u1ec7t v\u00e0 \u0111\u1ed9ng v\u1eadt bi\u1ebfn nhi\u1ec7t nh\u01b0 th\u1ebf n\u00e0o? 1. \u0110\u1ed1i v\u1edbi \u0111\u1ed9ng v\u1eadt bi\u1ebfn nhi\u1ec7t: - Nhi\u1ec7t \u0111\u1ed9 xu\u1ed1ng th\u1ea5p (tr\u1eddi r\u00e9t) l\u00e0m th\u00e2n nhi\u1ec7t c\u1ee7a \u0111\u1ed9ng v\u1eadt gi\u1ea3m theo, c\u00e1c qu\u00e1 tr\u00ecnh chuy\u1ec3n ho\u00e1 trong c\u01a1 th\u1ec3 gi\u1ea3m th\u1eadm ch\u00ed b\u1ecb r\u1ed1i lo\u1ea1n, c\u00e1c ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt nh\u01b0 sinh s\u1ea3n, ki\u1ebfm \u0103n... gi\u1ea3m. \u0110i\u1ec1u n\u00e0y l\u00e0m qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n ch\u1eadm l\u1ea1i. 2. \u0110\u1ed1i v\u1edbi \u0111\u1ed9ng v\u1eadt h\u1eb1ng nhi\u1ec7t: -Khi nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng xu\u1ed1ng th\u1ea5p (tr\u1eddi r\u00e9t), do th\u00e2n nhi\u1ec7t cao h\u01a1n nhi\u1ec1u so v\u1edbi nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng n\u00ean \u0111\u1ed9ng v\u1eadt m\u1ea5t r\u1ea5t nhi\u1ec1u nhi\u1ec7t v\u00e0o m\u00f4i tr\u01b0\u1eddng xung quanh. \u0110\u1ec3 b\u00f9 l\u1ea1i s\u1ed1 l\u01b0\u1ee3ng nhi\u1ec7t \u0111\u00e3 m\u1ea5t v\u00e0 duy tr\u00ec th\u00e2n nhi\u1ec7t \u1ed5n \u0111\u1ecbnh, c\u01a1 ch\u1ebf ch\u1ed1ng l\u1ea1nh \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng, qu\u00e1 tr\u00ecnh chuy\u1ec3n ho\u00e1 \u1edf t\u1ebf b\u00e0o t\u0103ng l\u00ean, c\u00e1c ch\u1ea5t b\u1ecb oxy ho\u00e1 nhi\u1ec1u h\u01a1n, n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c \u0103n \u0111\u1ea7y \u0111\u1ee7 \u0111\u1ec3 b\u00f9 l\u1ea1i c\u00e1c ch\u1ea5t \u0111\u00e3 b\u1ecb oxy ho\u00e1 (t\u0103ng kh\u1ea9u ph\u1ea7n \u0103n so v\u1edbi ng\u00e0y b\u00ecnh th\u01b0\u1eddng) \u0111\u1ed9ng v\u1eadt s\u1ebd b\u1ecb s\u00fat c\u00e2n v\u00e0 d\u1ec5 m\u1eafc b\u1ec7nh, th\u1eadm ch\u00ed c\u00f3 th\u1ec3 ch\u1ebft. -Tuy nhi\u00ean, v\u00e0o nh\u1eefng ng\u00e0y tr\u1eddi r\u00e9t, n\u1ebfu \u0111\u01b0\u1ee3c \u0103n u\u1ed1ng \u0111\u1ea7y \u0111\u1ee7 \u0111\u1ed9ng v\u1eadt s\u1ebd t\u0103ng c\u00e2n do c\u01a1 th\u1ec3 t\u0103ng c\u01b0\u1eddng chuy\u1ec3n ho\u00e1 v\u00e0 t\u00edch lu\u1ef9 c\u00e1c ch\u1ea5t d\u1ef1 tr\u1eef ch\u1ed1ng r\u00e9t. 2. T\u1ea1i sao th\u1ee9c \u0103n l\u1ea1i c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt? - C\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f3 trong th\u1ee9c \u0103n l\u00e0 nguy\u00ean li\u1ec7u \u0111\u01b0\u1ee3c c\u01a1 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 t\u0103ng s\u1ed1 l\u01b0\u1ee3ng v\u00e0 t\u0103ng k\u00edch th\u01b0\u1edbc t\u1ebf b\u00e0o, h\u00ecnh th\u00e0nh c\u00e1c c\u01a1 quan v\u00e0 h\u1ec7 c\u01a1 quan. C\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng c\u00f2n l\u00e0 ngu\u1ed3n cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a \u0111\u1ed9ng v\u1eadt. 3. T\u1ea1i sao cho tr\u1ebb nh\u1ecf t\u1eafm n\u1eafng v\u00e0o s\u00e1ng s\u1edbm ho\u1eb7c chi\u1ec1u t\u1ed1i (khi \u00e1nh s\u00e1ng y\u1ebfu) s\u1ebd c\u00f3 l\u1ee3i cho sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a ch\u00fang? -T\u1eafm n\u1eafng cho tr\u1ebb khi \u00e1nh s\u00e1ng y\u1ebfu (gi\u00e0u tia t\u1eed ngo\u1ea1i) gi\u00fap \u0111\u1ea9y m\u1ea1nh qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh x\u01b0\u01a1ng c\u1ee7a tr\u1ebb. Tia t\u1eed ngo\u1ea1i l\u00e0m cho ti\u1ec1n vitamin D bi\u1ebfn th\u00e0nh vitamin D. Vitamin D c\u00f3 vai tr\u00f2 trong chuy\u1ec3n ho\u00e1 canxi \u0111\u1ec3 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng qua \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng l\u00ean qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a tr\u1ebb. - Kh\u00f4ng n\u00ean t\u1eafm cho tr\u1ebb khi \u00e1nh s\u00e1ng m\u1ea1nh v\u00ec nhi\u1ec1u tia c\u1ef1c t\u00edm s\u1ebd c\u00f3 h\u1ea1i cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u1ee7a tr\u1ebb. 4. S\u1ef1 kh\u00e1c nhau c\u01a1 b\u1ea3n gi\u1eefa ph\u00e1t tri\u1ec3n qua bi\u1ebfn th\u00e1i v\u00e0 kh\u00f4ng qua bi\u1ebfn th\u00e1i l\u00e0 g\u00ec? -\u1ede ph\u00e1t tri\u1ec3n kh\u00f4ng qua bi\u1ebfn th\u00e1i, con non c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, c\u1ea5u t\u1ea1o v\u00e0 sinh l\u00ed g\u1ea7n gi\u1ed1ng v\u1edbi con tr\u01b0\u1edfng th\u00e0nh v\u00e0 \u0111\u1ec3 ph\u00e1t tri\u1ec3n th\u00e0nh con tr\u01b0\u1edfng th\u00e0nh th\u00ec ch\u00fang kh\u00f4ng ph\u1ea3i tr\u1ea3i qua giai \u0111o\u1ea1n l\u1ed9t x\u00e1c. -Ng\u01b0\u1ee3c l\u1ea1i, \u1edf ph\u00e1t tri\u1ec3n qua bi\u1ebfn th\u00e1i th\u00ec so v\u1edbi con tr\u01b0\u1edfng th\u00e0nh, con non mang nhi\u1ec1u \u0111\u1eb7c \u0111i\u1ec3m sai kh\u00e1c h\u01a1n v\u00e0 \u0111\u1ec3 b\u01b0\u1edbc sang giai \u0111o\u1ea1n tr\u01b0\u1edfng th\u00e0nh, ch\u00fang ph\u1ea3i tr\u1ea3i qua nhi\u1ec1u l\u1ea7n l\u1ed9t x\u00e1c. 5. H\u00e3y t\u00ecm m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 th\u1ef1c ti\u1ec5n c\u1ea3i t\u1ea1o gi\u1ed1ng di truy\u1ec1n, t\u1ea1o ra gi\u1ed1ng v\u1eadt nu\u00f4i c\u00f3 t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n nhanh, n\u0103ng su\u1ea5t cao. -Ch\u1ecdn l\u1ecdc nh\u00e2n t\u1ea1o: khi nu\u00f4i c\u00e1c lo\u00e0i gia s\u00fac, gia c\u1ea7m (g\u00e0, l\u1edbn, b\u00f2...) ng\u01b0\u1eddi ta th\u01b0\u1eddng ch\u1ecdn nh\u1eefng con kho\u1ebb m\u1ea1nh, l\u1edbn nhanh \u0111\u1ec3 l\u00e0m gi\u1ed1ng. -Lai gi\u1ed1ng gi\u1eefa l\u1ee3n, b\u00f2 ...\u0111\u1ecba ph\u01b0\u01a1ng v\u1edbi c\u00e1c gi\u1ed1ng nh\u1eadp ngo\u1ea1i c\u00f3 t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng nhanh v\u00e0 c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn khi tr\u01b0\u1edfng th\u00e0nh v\u00e0 cho n\u0103ng su\u1ea5t cao. 6. T\u1ea1i sao s\u00e2u b\u01b0\u1edbm ph\u00e1 ho\u1ea1i c\u00e2y c\u1ed1i, m\u00f9a m\u00e0ng r\u1ea5t gh\u00ea g\u1edbm, trong khi \u0111\u00f3 b\u01b0\u1edbm tr\u01b0\u1edfng th\u00e0nh l\u1ea1i th\u01b0\u1eddng kh\u00f4ng g\u00e2y h\u1ea1i cho c\u00e2y tr\u1ed3ng? -Th\u1ee9c \u0103n ch\u1ee7 y\u1ebfu c\u1ee7a s\u00e2u b\u01b0\u1edbm l\u00e0 l\u00e1 c\u00e2y nh\u01b0ng v\u00ec kh\u00f4ng c\u00f3 enzyme ti\u00eau ho\u00e1 cellulose n\u00ean hi\u1ec7u qu\u1ea3 ti\u00eau ho\u00e1 v\u00e0 h\u1ea5p th\u1ee5 th\u1ee9c \u0103n r\u1ea5t th\u1ea5p. B\u00f9 l\u1ea1i \u0111i\u1ec1u n\u00e0y, s\u00e2u ph\u1ea3i \u0103n r\u1ea5t nhi\u1ec1u l\u00e1 c\u00e2y m\u1edbi \u0111\u00e1p \u1ee9ng \u0111\u1ee7 nhu c\u1ea7u dinh d\u01b0\u1ee1ng c\u1ee7a c\u01a1 th\u1ec3, b\u1edfi v\u1eady, ch\u00fang \u0111\u01b0\u1ee3c xem l\u00e0 v\u1eadt g\u00e2y h\u1ea1i tr\u00ean \u0111\u1ed3ng ru\u1ed9ng. - Trong khi \u0111\u00f3, h\u1ea7u h\u1ebft c\u00e1c lo\u00e0i b\u01b0\u1edbm ch\u1ec9 \u0103n m\u1eadt hoa n\u00ean kh\u00f4ng ph\u00e1 ho\u1ea1i c\u00e2y tr\u1ed3ng m\u00e0 c\u00f2n gi\u00fap c\u00e2y tr\u1ed3ng th\u1ee5 ph\u1ea5n. 7. S\u1ef1 bi\u1ebfn th\u00e1i \u1edf b\u01b0\u1edbm c\u00f3 \u00fd ngh\u0129a th\u00edch nghi nh\u01b0 th\u1ebf n\u00e0o? Trang 1\/2","-V\u00e0o m\u00f9a xu\u00e2n h\u00e8, khi th\u1eddi ti\u1ebft \u1ea5m \u00e1p, c\u00e2y c\u1ed1i \u0111\u00e2m ch\u1ed3i, n\u1ea3y l\u1ed9c, l\u00e1 non m\u01a1n m\u1edfn c\u0169ng l\u00e0 l\u00fac c\u00e1c lo\u00e0i s\u00e2u b\u01b0\u1edbm ph\u00e1t tri\u1ec3n r\u1ed9 \u0111\u1ec3 t\u1eadn d\u1ee5ng ngu\u1ed3n th\u1ee9c \u0103n n\u00e0y. - Sang ti\u1ebft thu \u0111\u00f4ng s\u00e2u b\u01b0\u1edbm l\u1ea1i k\u1ebft k\u00e9n, ho\u00e1 nh\u1ed9ng \u0111\u1ec3 n\u00e9 tr\u00e1nh \u0111i\u1ec1u ki\u1ec7n th\u1eddi ti\u1ebft kh\u1eafc nghi\u1ec7t, v\u1eeba \u0111\u1ec3 t\u1eadp trung ch\u1ea5t dinh d\u01b0\u1ee1ng, chu\u1ea9n b\u1ecb cho s\u1ef1 \u201cc\u1ef1a m\u00ecnh\u201d, bi\u1ebfn \u0111\u1ed5i th\u00e0nh b\u01b0\u1edbm tr\u01b0\u1edfng th\u00e0nh. \u1ede giai \u0111o\u1ea1n b\u01b0\u1edbm tr\u01b0\u1edfng th\u00e0nh, d\u1ea1ng s\u1ed1ng n\u00e0y l\u1ea1i t\u00ecm \u0111\u1ebfn th\u00e2n c\u00e2y h\u00fat nh\u1ef1a hay c\u00e1c b\u00f4ng hoa \u0111\u1ec3 h\u00fat m\u1eadt. -Nh\u01b0 v\u1eady trong qu\u00e1 tr\u00ecnh ti\u1ebfn ho\u00e1, v\u00f2ng \u0111\u1eddi c\u1ee7a b\u01b0\u1edbm \u0111\u00e3 thu\u1eadn ho\u00e1 v\u1edbi quy lu\u1eadt chuy\u1ec3n m\u00f9a c\u1ee7a t\u1ef1 nhi\u00ean. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang t\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ngu\u1ed3n s\u1ed1ng, gi\u1ea3m thi\u1ec3u r\u1ee7i ro, nh\u1edd \u0111\u00f3 m\u00e0 ng\u00e0y c\u00e0ng th\u00edch nghi v\u1edbi nh\u1eefng thay \u0111\u1ed5i th\u01b0\u1eddng xuy\u00ean c\u1ee7a \u0111i\u1ec1u ki\u1ec7n ngo\u1ea1i c\u1ea3nh. 8. Cho bi\u1ebft m\u1ed9t s\u1ed1 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt th\u00fac \u0111\u1ea9y qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n, t\u0103ng n\u0103ng su\u1ea5t v\u1eadt nu\u00f4i. -C\u00f3 c\u00e1c ch\u1ebf \u0111\u1ed9 dinh d\u01b0\u1ee1ng th\u00edch h\u1ee3p cho \u0111\u1ed9ng v\u1eadt nu\u00f4i trong c\u00e1c giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n kh\u00e1c nhau. V\u00ed d\u1ee5: ch\u1ebf \u0111\u1ed9 dinh d\u01b0\u1ee1ng khi \u0111\u1ed9ng v\u1eadt mang thai, khi \u0111\u1ed9ng v\u1eadt m\u1edbi sinh ra. -Chu\u1ed3ng tr\u1ea1i s\u1ea1ch s\u1ebd, \u1ea5m v\u1ec1 m\u00f9a \u0111\u00f4ng, m\u00e1t v\u1ec1 m\u00f9a h\u00e8, c\u00f3 \u00e1nh s\u00e1ng cho gia s\u00fac non t\u1eafm n\u1eafng... \u0111\u1ec3 \u0111\u1ed9ng v\u1eadt kh\u00f4ng b\u1ecb m\u1eafc b\u1ec7nh kh\u00f4ng t\u1ed1n n\u0103ng l\u01b0\u1ee3ng cho \u0111i\u1ec1u ho\u00e0 th\u00e2n nhi\u1ec7t. 9. Tr\u00ecnh b\u00e0y \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c nh\u00e2n t\u1ed1 b\u00ean trong v\u1edbi sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt? N\u00eau v\u00ed d\u1ee5. 1. Di truy\u1ec1n: + C\u00e1c h\u1ec7 th\u1ed1ng gen ch\u1ecbu tr\u00e1ch nhi\u1ec7m \u0111i\u1ec1u ki\u1ec3n sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n \u1edf \u0111\u1ed9ng v\u1eadt. + Y\u1ebfu t\u1ed1 di truy\u1ec1n: quy \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 l\u1edbn v\u00e0 gi\u1edbi h\u1ea1n l\u1edbn kh\u00e1c nhau \u1edf c\u00e1c lo\u00e0i, gi\u1ed1ng \u0111\u1ed9ng v\u1eadt. + Gi\u1edbi t\u00ednh: C\u00f9ng m\u1ed9t lo\u00e0i, s\u1ef1 sinh tr\u01b0\u1edfng c\u1ee7a gi\u1edbi \u0111\u1ef1c v\u00e0 gi\u1edbi c\u00e1i kh\u00e1c nhau. Th\u01b0\u1eddng th\u00ec con c\u00e1i c\u00f3 t\u1ed1c \u0111\u1ed9 l\u1edbn nhanh h\u01a1n v\u00e0 s\u1ed1ng l\u00e2u h\u01a1n. 2. Hormone + Hormone \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt c\u00f3 x\u01b0\u01a1ng s\u1ed1ng: - Hormone sinh tr\u01b0\u1edfng (GH): tuy\u1ebfn y\u00ean ti\u1ebft ra. - Tiroxin: tuy\u1ebfn gi\u00e1p ti\u1ebft ra. - Testosterone: tinh ho\u00e0n ti\u1ebft. - Estrogen: bu\u1ed3ng tr\u1ee9ng ti\u1ebft ra. + Hormone \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt kh\u00f4ng x\u01b0\u01a1ng s\u1ed1ng: - Ecdixon: tuy\u1ebfn tr\u01b0\u1edbc ng\u1ef1c ti\u1ebft ra. - Juvenin: \u0111\u00f4i tuy\u1ebfn n\u1ed9i ti\u1ebft c\u00f3 t\u00ean l\u00e0 th\u1ec3 alata ti\u1ebft ra. 10. Vi\u1ec7c \u1ea5p tr\u1ee9ng \u1edf c\u00e1c lo\u00e0i chim c\u00f3 vai tr\u00f2 g\u00ec? - H\u1ee3p t\u1eed c\u1ee7a c\u00e1c lo\u00e0i ch\u1ec9 ph\u00e1t tri\u1ec3n trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 th\u00edch h\u1ee3p. Chim \u1ea5p tr\u1ee9ng \u0111\u1ec3 t\u1ea1o ra nhi\u1ec7t \u0111\u1ed9 th\u00edch h\u1ee3p trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh gi\u00fap h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n b\u00ecnh th\u01b0\u1eddng. Trang 2\/2","\u0110\u00c1P \u00c1N B\u00c0I T\u1eacP B\u00c0I T\u1eacPTR\u1eaeC NGHI\u1ec6M \u00d4N T\u1eacP CH\u1ee6 \u0110\u1ec0: SINH TR\u01af\u1edeNG V\u00c0 PH\u00c1T TRI\u1ec2N \u1ede SINH V\u1eacT Khoa h\u1ecdc t\u1ef1 nhi\u00ean 7 1. Ph\u00e1t tri\u1ec3n c\u1ee7a c\u01a1 th\u1ec3 \u0111\u1ed9ng v\u1eadt bao g\u1ed3m B. c\u00e1c qu\u00e1 tr\u00ecnh li\u00ean quan m\u1eadt thi\u1ebft v\u1edbi nhau l\u00e0 ph\u00e2n ho\u00e1 A. c\u00e1c qu\u00e1 tr\u00ecnh li\u00ean quan m\u1eadt thi\u1ebft v\u1edbi nhau l\u00e0 sinh t\u1ebf b\u00e0o v\u00e0 ph\u00e1t sinh h\u00ecnh th\u00e1i c\u00e1c c\u01a1 quan v\u00e0 c\u01a1 th\u1ec3. tr\u01b0\u1edfng v\u00e0 ph\u00e2n ho\u00e1 t\u1ebf b\u00e0o D. c\u00e1c qu\u00e1 tr\u00ecnh li\u00ean quan m\u1eadt thi\u1ebft v\u1edbi nhau l\u00e0 sinh tr\u01b0\u1edfng, ph\u00e2n ho\u00e1 t\u1ebf b\u00e0o v\u00e0 ph\u00e1t sinh h\u00ecnh th\u00e1i c\u00e1c c\u01a1 C. c\u00e1c qu\u00e1 tr\u00ecnh li\u00ean quan m\u1eadt thi\u1ebft v\u1edbi nhau l\u00e0 sinh quan v\u00e0 c\u01a1 th\u1ec3. tr\u01b0\u1edfng v\u00e0 ph\u00e1t sinh h\u00ecnh th\u00e1i c\u00e1c c\u01a1 quan v\u00e0 c\u01a1 th\u1ec3. Ph\u00e1t tri\u1ec3n c\u1ee7a c\u01a1 th\u1ec3 \u0111\u1ed9ng v\u1eadt bao g\u1ed3m: C\u00e1c qu\u00e1 tr\u00ecnh li\u00ean quan m\u1eadt thi\u1ebft v\u1edbi nhau l\u00e0 sinh tr\u01b0\u1edfng, ph\u00e2n ho\u00e1 t\u1ebf b\u00e0o v\u00e0 ph\u00e1t sinh h\u00ecnh th\u00e1i c\u00e1c c\u01a1 quan v\u00e0 c\u01a1 th\u1ec3. 2. M\u00f4 ph\u00e2n sinh \u0111\u01b0\u1ee3c chia l\u00e0m m\u1ea5y lo\u1ea1i ch\u00ednh? A. 2. B. 3. C. 4. D. 5. C\u00f3 hai lo\u1ea1i m\u00f4 ph\u00e2n sinh ch\u00ednh: m\u00f4 ph\u00e2n sinh \u0111\u1ec9nh v\u00e0 m\u00f4 ph\u00e2n sinh b\u00ean. 3. V\u00ec sao nu\u00f4i c\u00e1 r\u00f4 phi n\u00ean thu ho\u1ea1ch sau 1 n\u0103m m\u00e0 kh\u00f4ng \u0111\u1ec3 l\u00e2u h\u01a1n? A. C\u00e1 nu\u00f4i l\u00e2u th\u1ecbt s\u1ebd dai v\u00e0 kh\u00f4ng ngon. B. Sau 1 n\u0103m c\u00e1 \u0111\u00e3 \u0111\u1ea1t k\u00edch th\u01b0\u1edbc t\u1ed1i \u0111a. C. C\u00e1 r\u00f4 phi c\u00f3 tu\u1ed5i th\u1ecd ng\u1eafn. D. T\u1ed1c \u0111\u1ed9 l\u1edbn c\u1ee7a c\u00e1 r\u00f4 phi nhanh nh\u1ea5t \u1edf n\u0103m \u0111\u1ea7u sau \u0111\u00f3 s\u1ebd gi\u1ea3m. -C\u00e1 r\u00f4 phi c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng t\u1ed1i \u0111a l\u00e0 kho\u1ea3ng 4kg\/con trong th\u1eddi gian nu\u00f4i 3 n\u0103m. Trong 1 n\u0103m \u0111\u1ea7u ti\u00ean th\u00ec ch\u00fang \u0111\u1ea1t kho\u1ea3ng 1,5 \u2013 1,8kg\/con. - C\u00f3 th\u1ec3 th\u1ea5y nu\u00f4i l\u00e2u s\u1ebd d\u1eabn t\u1edbi: + T\u1ed1n th\u1ee9c \u0103n, t\u1ed1n c\u00f4ng ch\u0103m s\u00f3c. + Th\u1ecbt c\u00e1 dai, kh\u00f4ng ngon. 4. \u01afu \u0111i\u1ec3m c\u1ee7a sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 B. t\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 con th\u00edch nghi cao v\u1edbi \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng. A. t\u1ea1o ra c\u00e1c c\u00e1 th\u1ec3 con \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa. C. sinh s\u1ea3n d\u1ec5 d\u00e0ng trong \u0111i\u1ec1u ki\u1ec7n qu\u1ea7n th\u1ec3 c\u00f3 s\u1ed1 l\u01b0\u1ee3ng D. sinh s\u1ea3n v\u00f4 t\u00ednh \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong ti\u1ebfn h\u00f3a. nh\u1ecf. \u01afu \u0111i\u1ec3m c\u1ee7a sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 sinh s\u1ea3n d\u1ec5 d\u00e0ng trong \u0111i\u1ec1u ki\u1ec7n qu\u1ea7n th\u1ec3 c\u00f3 s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf. 5. Trong \u0111\u1eddi s\u1ed1ng, vi\u1ec7c s\u1ea3n xu\u1ea5t gi\u00e1 \u0111\u1ec3 \u0103n, l\u00e0m m\u1ea1ch nha \u0111\u00e3 \u1ee9ng d\u1ee5ng giai \u0111o\u1ea1n n\u00e0o trong chu k\u00ec sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a th\u1ef1c v\u1eadt? A. Giai \u0111o\u1ea1n n\u1ea3y m\u1ea7m. B. Giai \u0111o\u1ea1n ra hoa. C. Giai \u0111o\u1ea1n t\u1ea1o qu\u1ea3 ch\u00edn. D. Giai \u0111o\u1ea1n m\u1ecdc l\u00e1, sinh tr\u01b0\u1edfng m\u1ea1ch. Vi\u1ec7c s\u1ea3n xu\u1ea5t gi\u00e1 \u0111\u1ec3 \u0103n (\u0111\u1eadu \u0111\u1ed7) t\u1ee9c l\u00e0 \u1ee7 cho h\u1ea1t \u0111\u1eadu n\u1ea3y m\u1ea7m, l\u00e0m m\u1ea1ch nha (l\u00faa) l\u00e0 v\u1eadn d\u1ee5ng qu\u00e1 tr\u00ecnh chuy\u1ec3n h\u00f3a tinh b\u1ed9t th\u00e0nh \u0111\u01b0\u1eddng trong qu\u00e1 tr\u00ecnh n\u1ea3y m\u1ea7m c\u1ee7a l\u00faa. 6. \u1ede c\u00e1c lo\u00e0i chim, vi\u1ec7c \u1ea5p tr\u1ee9ng c\u00f3 t\u00e1c d\u1ee5ng B. t\u0103ng t\u1ec9 l\u1ec7 s\u1ed1ng c\u1ee7a tr\u1ee9ng \u0111\u00e3 th\u1ee5 tinh. A. t\u1ea1o nhi\u1ec7t \u0111\u1ed9 th\u00edch h\u1ee3p trong th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh gi\u00fap D. t\u0103ng m\u1ed1i quan h\u1ec7 gi\u1eefa b\u1ed1 m\u1eb9 v\u00e0 con. h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n. C. b\u1ea3o v\u1ec7 tr\u1ee9ng kh\u00f4ng b\u1ecb k\u1ebb th\u00f9 t\u1ea5n c\u00f4ng l\u1ea5y \u0111i. \u1ede c\u00e1c lo\u00e0i chim, vi\u1ec7c \u1ea5p tr\u1ee9ng c\u00f3 t\u00e1c d\u1ee5ng t\u1ea1o nhi\u1ec7t \u0111\u1ed9 th\u00edch h\u1ee3p trong th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh gi\u00fap h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n. 7. Hormone n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh s\u1ea3n c\u1ee7a th\u1ef1c v\u1eadt? Trang 1\/6","A. LH. B. Florigen. C. FSH. D. Testosterone. L\u00e0 hormone k\u00edch th\u00edch ra hoa, h\u1ee3p ch\u1ea5t c\u1ee7a Gibberellin (k\u00edch th\u00edch sinh tr\u01b0\u1edfng c\u1ee7a \u0111\u1ebf hoa) v\u00e0 Antezin (k\u00edch th\u00edch s\u1ef1 ra m\u1ea7m hoa - ch\u1ea5t gi\u1ea3 thi\u1ebft). 8. N\u1ebfu thi\u1ebfu n\u01b0\u1edbc, qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a sinh v\u1eadt s\u1ebd A. t\u0103ng nhanh t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n. B. di\u1ec5n ra b\u00ecnh th\u01b0\u1eddng. C. ph\u00e1t tri\u1ec3n ch\u1eadm l\u00fac ban \u0111\u1ea7u nh\u01b0ng sau \u0111\u00f3 t\u0103ng nhanh. D. b\u1ecb ch\u1eadm ho\u1eb7c ng\u1eebng l\u1ea1i, th\u1eadm ch\u00ed l\u00e0 ch\u1ebft. N\u01b0\u1edbc l\u00e0 nh\u00e2n t\u1ed1 \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng v\u1edbi s\u1ef1 t\u1ed3n t\u1ea1i v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a m\u1ecdi sinh v\u1eadt. Tham gia v\u00e0o qu\u00e1 tr\u00ecnh s\u1ed1ng trong c\u01a1 th\u1ec3. N\u1ebfu thi\u1ebfu n\u01b0\u1edbc, qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a sinh v\u1eadt s\u1ebd b\u1ecb ch\u1eadm ho\u1eb7c ng\u1eebng l\u1ea1i, th\u1eadm ch\u00ed l\u00e0 ch\u1ebft. 9. Mu\u1ed1n t\u0103ng nhanh \u0111\u00e0n gia s\u00fac, ng\u01b0\u1eddi ta th\u01b0\u1eddng \u00e1p d\u1ee5ng nh\u1eefng bi\u1ec7n ph\u00e1p n\u00e0o sau \u0111\u00e2y? 1 - T\u0103ng nhi\u1ec1u con \u0111\u1ef1c. 2 - T\u0103ng nhi\u1ec1u con c\u00e1i. 3- B\u1ed1 tr\u00ed s\u1ed1 con \u0111\u1ef1c v\u00e0 con c\u00e1i nh\u01b0 nhau. 4 - T\u00e1ch con non ra kh\u1ecfi con m\u1eb9 s\u1edbm. A. 2, 3, 4. B. 2,4. C. 1, 2, 3, 4. D. 1, 2, 3. Mu\u1ed1n t\u0103ng nhanh \u0111\u00e0n gia s\u00fac, gia c\u1ea7m ng\u01b0\u1eddi ta th\u01b0\u1eddng \u00e1p d\u1ee5ng nh\u1eefng bi\u1ec7n ph\u00e1p: T\u0103ng nhi\u1ec1u con c\u00e1i v\u00e0 t\u00e1ch con non ra kh\u1ecfi m\u1eb9 s\u1edbm. V\u00ec \u1edf gia s\u00fac, gia c\u1ea7m m\u1ed9t con \u0111\u1ef1c c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u sinh s\u1ea3n c\u1ee7a nhi\u1ec1u con c\u00e1i, do \u0111\u00f3 s\u1ed1 l\u01b0\u1ee3ng \u0111\u00e0n con ph\u1ee5 thu\u1ed9c nhi\u1ec1u v\u00e0o s\u1ed1 l\u01b0\u1ee3ng con c\u00e1i h\u01a1n l\u00e0 s\u1ed1 l\u01b0\u1ee3ng con \u0111\u1ef1c. Vi\u1ec7c t\u00e1ch con non ra kh\u1ecfi m\u1eb9 s\u1edbm gi\u00fap con c\u00e1i c\u00f3 th\u1ec3 nhanh ch\u00f3ng quay tr\u1edf l\u1ea1i chu k\u00ec sinh s\u1ea3n m\u1edbi nh\u01b0 v\u1eady s\u1ebd t\u0103ng s\u1ed1 l\u1ee9a \u0111\u1ebb trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh gi\u00fap t\u0103ng nhanh s\u1ed1 l\u01b0\u1ee3ng trong \u0111\u00e0n. 10. V\u00ec sao sinh s\u1ea3n theo ki\u1ec3u giao ph\u1ed1i ti\u1ebfn ho\u00e1 h\u01a1n sinh s\u1ea3n v\u00f4 t\u00ednh? B. V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n A. V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m gi\u1ea3m xu\u1ea5t hi\u1ec7n nhi\u00eau bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p c\u00f3 h\u1ea1i v\u00e0 t\u0103ng c\u01b0\u1eddng xu\u1ea5t hi\u1ec7n nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p c\u00f3 l\u1ee3i th\u00edch nghi v\u1edbi s\u1ef1 kh\u1ea3 n\u0103ng th\u00edch nghi v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. C. V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n D. V\u00ec th\u1ec3 h\u1ec7 sau c\u00f3 s\u1ef1 \u0111\u1ed3ng nh\u1ea5t v\u1ec1 m\u1eb7t di truy\u1ec1n t\u1ea1o ra g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m kh\u1ea3 n\u0103ng th\u00edch nghi \u0111\u1ed3ng lo\u1ea1t v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i xu\u1ea5t hi\u1ec7n nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi tr\u01b0\u1eddng. v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. Sinh s\u1ea3n theo ki\u1ec3u giao ph\u1ed1i (H\u1eefu t\u00ednh) ti\u1ebfn h\u00f3a h\u01a1n sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0: V\u00ec th\u1ebf h\u1ec7 sau c\u00f3 s\u1ef1 t\u1ed5 h\u1ee3p v\u1eadt ch\u1ea5t di truy\u1ec1n c\u00f3 ngu\u1ed3n g\u1ed1c kh\u00e1c nhau t\u1ea1o ra s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 m\u1eb7t di truy\u1ec1n, l\u00e0m xu\u1ea5t hi\u1ec7n nhi\u1ec1u bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. \u00dd B sai v\u00ec c\u00e1c c\u00e1 th\u1ec3 sinh ra t\u1eeb sinh s\u1ea3n h\u1eefu t\u00ednh c\u00f3 ki\u1ec3u h\u00ecnh v\u00e0 ki\u1ec3u gen kh\u00e1c nhau. \u00dd C sai v\u00ec l\u00e0m t\u0103ng bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p. \u00dd D sai v\u00ec kh\u00f4ng ph\u1ea3i bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p n\u00e0o c\u0169ng c\u00f3 l\u1ee3i. 11. Trong s\u1ea3n xu\u1ea5t n\u00f4ng nghi\u1ec7p, ng\u01b0\u1eddi ta nh\u1ed5 m\u1ea1 l\u00ean r\u1ed3i c\u1ea5y nh\u1eb1m m\u1ee5c \u0111\u00edch g\u00ec? A. L\u00e0m \u0111\u1ee9t \u0111\u1ec9nh r\u1ec5 gi\u00fap b\u1ed9 r\u1ec5 ph\u00e1t tri\u1ec3n m\u1ea1nh. B. Gi\u00fap c\u00e2y l\u00faa \u0111\u1ebb nh\u00e1nh t\u1ed1t. C. L\u00e0m \u0111\u1ea5t tho\u00e1ng kh\u00ed. D. K\u00ecm h\u00e3m s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a l\u00faa ch\u1ed1ng l\u1ed1p \u0111\u1ed5. Nh\u1ed5 m\u1ea1 l\u00ean r\u1ed3i c\u1ea5y l\u1ea1i s\u1ebd k\u00edch th\u00edch m\u1ea1nh m\u1ebd s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a r\u1ec5 l\u00e0m c\u00e2y sinh tr\u01b0\u1edfng nhanh. \u0110\u1ec9nh r\u1ec5 l\u00e0 n\u01a1i s\u1ea3n sinh ra hormone cytokinin. Hormone n\u00e0y \u1ee9c ch\u1ebf s\u1ef1 h\u00ecnh th\u00e0nh r\u1ec5 b\u00ean. Khi nh\u1ed5 m\u1ea1 l\u00ean s\u1ebd l\u00e0m \u0111\u1ee9t r\u1ec5 c\u1ee7a c\u00e2y m\u1ea1, l\u00e0m gi\u1ea3m h\u00e0m l\u01b0\u1ee3ng cytokinin d\u1eabn \u0111\u1ebfn t\u1ec9 l\u1ec7 cytokinin gi\u1ea3m, kh\u00edch th\u00edch ra r\u1ec5 m\u1edbi. 12. H\u00ecnh th\u1ee9c sinh s\u1ea3n c\u00f3 s\u1ef1 h\u1ee3p nh\u1ea5t c\u1ee7a giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i t\u1ea1o n\u00ean h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi l\u00e0 kh\u00e1i ni\u1ec7m v\u1ec1 A. sinh s\u1ea3n b\u1eb1ng b\u00e0o t\u1eed. B. sinh s\u1ea3n v\u00f4 t\u00ednh. C. sinh s\u1ea3n h\u1eefu t\u00ednh. D. sinh s\u1ea3n b\u1eb1ng nu\u00f4i c\u1ea5y m\u00f4 t\u1ebf b\u00e0o. Sinh s\u1ea3n h\u1eefu t\u00ednh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p ng\u1eabu nhi\u00ean gi\u1eefa hai giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i t\u1ea1o n\u00ean h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n th\u00e0nh c\u01a1 th\u1ec3 m\u1edbi. 13. Th\u1eb1n l\u1eb1n b\u1ecb m\u1ea5t \u0111u\u00f4i c\u00f3 th\u1ec3 m\u1ecdc ra \u0111u\u00f4i m\u1edbi, \u0111\u00f3 l\u00e0 Trang 2\/6","A. ch\u1ec9 l\u00e0 s\u1ef1 t\u00e1i sinh m\u1ed9t b\u1ed9 ph\u1eadn c\u01a1 th\u1ec3. B. ki\u1ec3u sinh s\u1ea3n v\u00f4 t\u00ednh t\u00e1i sinh. C. k\u00ecnh th\u1ee9c sinh s\u1ea3n ph\u00e2n m\u1ea3nh. D. m\u1ed9t ki\u1ec3u c\u1ee7a s\u1ef1 sinh tr\u01b0\u1edfng. C\u00e1i \u0111u\u00f4i m\u1edbi c\u1ee7a th\u1eb1n l\u1eb1n kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t c\u01a1 th\u1ec3 n\u00ean \u0111\u00e2y ch\u1ec9 \u0111\u01b0\u1ee3c coi l\u00e0 s\u1ef1 t\u00e1i sinh m\u1ed9t b\u1ed9 ph\u1eadn c\u01a1 th\u1ec3. 14. Nh\u00e2n t\u1ed1 m\u00f4i tr\u01b0\u1eddng \u1ea3nh h\u01b0\u1edfng l\u1edbn nh\u1ea5t \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt l\u00e0 A. th\u1ee9c \u0103n. B. \u00e1nh s\u00e1ng. C. kh\u00ed h\u1eadu. D. nhi\u1ec7t \u0111\u1ed9. Th\u1ee9c \u0103n c\u00f3 vai tr\u00f2 cung c\u1ea5p nguy\u00ean li\u1ec7u cho sinh t\u1ed5ng h\u1ee3p ch\u1ea5t h\u1eefu c\u01a1, cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho m\u1ecdi ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng, t\u1ea1o n\u00ean c\u00e1c m\u00f4, c\u01a1 quan. Th\u1ee9c \u0103n kh\u00f4ng l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng v\u1edbi m\u1ecdi \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng b\u1ea5t l\u1ee3i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. Do \u0111\u00f3 nh\u00e2n t\u1ed1 th\u1ee9c \u0103n \u1ea3nh h\u01b0\u1edfng l\u1edbn nh\u1ea5t \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt. 15. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0o sau \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 l\u1ee3i th\u1ebf c\u1ee7a gi\u00e2m c\u00e0nh, chi\u1ebft c\u00e0nh? A. Gi\u1eef nguy\u00ean t\u00ednh tr\u1ea1ng t\u1ed1t m\u00e0 con ng\u01b0\u1eddi mong mu\u1ed1n. B. Th\u1eddi gian thu ho\u1ea1ch ng\u1eafn. C. Ti\u1ebft ki\u1ec7m c\u00f4ng ch\u0103m b\u00f3n. D. C\u00f3 t\u00ednh ch\u1ed1ng ch\u1ecbu cao. Gi\u00e2m c\u00e0nh v\u00e0 chi\u1ebft c\u00e0nh \u0111\u1ec1u c\u00f3 c\u00e1c l\u1ee3i th\u1ebf nh\u01b0: - Gi\u1eef nguy\u00ean t\u00ednh tr\u1ea1ng t\u1ed1t m\u00e0 con ng\u01b0\u1eddi mong mu\u1ed1n. - Th\u1eddi gian thu ho\u1ea1ch ng\u1eafn. - Ti\u1ebft ki\u1ec7m c\u00f4ng ch\u0103m b\u00f3n. 16. Ng\u01b0\u1eddi ta \u00e1p d\u1ee5ng bi\u1ec7n ph\u00e1p th\u1ee5 tinh nh\u00e2n t\u1ea1o \u0111\u1ed1i v\u1edbi c\u00e1 m\u00e8, c\u00e1 tr\u1eafm c\u00f3 trong ao nu\u00f4i. Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai? A. Do c\u00e1 m\u00e8, c\u00e1 tr\u1eafm kh\u00f4ng \u0111\u1ebb trong ao nu\u00f4i. B. Vi\u1ec7c l\u00e0m n\u00e0y nh\u1eb1m m\u1ee5c \u0111\u00edch t\u0103ng hi\u1ec7u su\u1ea5t qu\u00e1 tr\u00ecnh th\u1ee5 tinh. C. Vi\u1ec7c l\u00e0m n\u00e0y nh\u1eb1m m\u1ee5c \u0111\u00edch lai t\u1ea1o 2 gi\u1ed1ng c\u00e0 m\u00e8 v\u00e0 D. Vi\u1ec7c l\u00e0m n\u00e0y nh\u1eb1m m\u1ee5c \u0111\u00edch t\u0103ng t\u1ec9 l\u1ec7 s\u1ed1ng s\u00f3t c\u00faa c\u00e1 c\u00e1 tr\u1eafm c\u1ecf v\u1edbi nhau. con sau khi n\u1edf. Ng\u01b0\u1eddi ta \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 do c\u00e1 m\u00e8, c\u00e1 tr\u1eafm c\u1ecf kh\u00f4ng \u0111\u1ebb trong ao nu\u00f4i. \u0110\u1ed3ng th\u1eddi vi\u1ec7c l\u00e0m n\u00e0y c\u0169ng gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t th\u1ee5 tinh, t\u0103ng t\u1ef7 l\u1ec7 s\u1ed1ng s\u00f3t cho c\u00e1c c\u00e1 th\u1ec3 con. V\u00ec khi th\u1ee5 tinh, \u1ea5p n\u1edf nh\u00e2n t\u1ea1o th\u00ec m\u1ee9c \u0111\u1ed9 ph\u1ee5 thu\u1ed9c v\u00e0o m\u00f4i tr\u01b0\u1eddng gi\u1ea3m xu\u1ed1ng. 17. T\u1ea1i sao v\u00e0o nh\u1eefng ng\u00e0y m\u00f9a \u0111\u00f4ng c\u1ea7n cho gia s\u00fac non \u0103n nhi\u1ec1u th\u1ee9c \u0103n h\u01a1n \u0111\u1ec3 ch\u00fang c\u00f3 th\u1ec3 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n b\u00ecnh th\u01b0\u1eddng? A. \u0110\u1ed1i v\u1edbi gia s\u00fac non, m\u00f9a \u0111\u00f4ng \u0103n nhi\u1ec1u m\u1edbi \u0111\u1ee7 ch\u1ea5t B. \u0110\u1ed1i v\u1edbi gia s\u00fac non, m\u00f9a \u0111\u00f4ng \u0103n nhi\u1ec1u m\u1edbi \u0111\u1ee7 \u0111\u1ec3 \u0111\u1ec3 ph\u00e1t tri\u1ec3n b\u1ed9 x\u01b0\u01a1ng do \u00edt \u00e1nh s\u00e1ng. cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho s\u1ef1 ph\u00e1t tri\u1ec3n b\u1ed9 x\u01b0\u01a1ng - h\u1ec7 c\u01a1. C. \u0110\u1ed1i v\u1edbi gia s\u00fac non, m\u00f9a \u0111\u00f4ng l\u1ea1nh gi\u00e1 g\u00e2y m\u1ea5t nhi\u1ec1u nhi\u1ec7t, n\u1ebfu kh\u00f4ng t\u0103ng kh\u1ea9u ph\u1ea7n \u0103n s\u1ebd l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh D. \u0110\u1ed1i v\u1edbi gia s\u00fac non, m\u00f9a \u0111\u00f4ng l\u1ea1nh gi\u00e1 \u0103n nhi\u1ec1u m\u1edbi sinh tr\u01b0\u1edfng. \u0111\u1ee7 n\u0103ng l\u01b0\u1ee3ng \u0111\u1ec3 ch\u1ed1ng r\u00e9t. V\u00e0o nh\u1eefng ng\u00e0y m\u00f9a \u0111\u00f4ng c\u1ea7n cho gia s\u00fac non \u0103n nhi\u1ec1u th\u1ee9c \u0103n h\u01a1n \u0111\u1ec3 ch\u00fang c\u00f3 th\u1ec3 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n b\u00ecnh th\u01b0\u1eddng v\u00ec \u0111\u1ed1i v\u1edbi gia s\u00fac non, m\u00f9a \u0111\u00f4ng l\u1ea1nh gi\u00e1 g\u00e2y m\u1ea5t nhi\u1ec1u nhi\u1ec7t, n\u1ebfu kh\u00f4ng t\u0103ng kh\u1ea9u ph\u1ea7n \u0103n s\u1ebd l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng. 18. Truy\u1ec1n m\u00e1u gi\u1eefa hai anh em sinh \u0111\u00f4i c\u00f9ng tr\u1ee9ng c\u00f3 th\u1ec3 coi l\u00e0 B. t\u1ef1 gh\u00e9p v\u00ec hai c\u01a1 th\u1ec3 c\u00f3 ki\u1ec3u gen ho\u00e0n to\u00e0n gi\u1ed1ng A. tr\u01b0\u1eddng h\u1ee3p n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 gh\u00e9p m\u00f4. nhau. C. d\u1ecb gh\u00e9p, v\u00ec hai c\u01a1 th\u1ec3 c\u00f3 th\u1ec3 kh\u00f4ng c\u00f9ng nh\u00f3m m\u00e1u. D. \u0111\u1ed3ng gh\u00e9p, v\u00ec \u0111\u00e2y l\u00e0 hai c\u01a1 th\u1ec3 kh\u00e1c nhau. Truy\u1ec1n m\u00e1u kh\u00f4ng \u0111\u01b0\u1ee3c coi l\u00e0 gh\u00e9p m\u00f4 v\u00ec c\u00e1c t\u1ebf b\u00e0o m\u00e1u n\u00e0y ch\u1ec9 l\u00e0m nhi\u1ec7m v\u1ee5 v\u1eadn chuy\u1ec3n kh\u00ed, d\u01b0\u1ee1ng ch\u1ea5t sau \u0111\u00f3 c\u00e1c t\u1ebf b\u00e0o n\u00e0y \u0111\u01b0\u1ee3c thay th\u1ebf b\u1edfi c\u00e1c t\u1ebf b\u00e0o m\u1edbi m\u00e0 c\u01a1 th\u1ec3 s\u1ea3n sinh ra. N\u1ebfu gh\u00e9p t\u1ebf b\u00e0o t\u1ee7y x\u01b0\u01a1ng ho\u1eb7c t\u1ebf b\u00e0o sinh m\u00e1u m\u1edbi \u0111\u01b0\u1ee3c coi l\u00e0 gh\u00e9p m\u00f4. 19. S\u1ef1 sinh tr\u01b0\u1edfng c\u1ee7a nh\u00f3m \u0111\u1ed9ng v\u1eadt n\u00e0o kh\u00f4ng \u0111\u1eb7c tr\u01b0ng b\u1edfi qu\u00e1 tr\u00ecnh nguy\u00ean ph\u00e2n? A. \u0110\u1ed9ng v\u1eadt kh\u00f4ng x\u01b0\u01a1ng s\u1ed1ng. B. \u0110\u1ed9ng v\u1eadt c\u00f3 bi\u1ebfn th\u00e1i kh\u00f4ng ho\u00e0n to\u00e0n. C. \u0110\u1ed9ng v\u1eadt nguy\u00ean sinh. D. \u0110\u1ed9ng v\u1eadt c\u00f3 x\u01b0\u01a1ng s\u1ed1ng. S\u1ef1 sinh tr\u01b0\u1edfng c\u1ee7a nh\u00f3m \u0111\u1ed9ng v\u1eadt kh\u00f4ng \u0111\u1eb7c tr\u01b0ng b\u1edfi qu\u00e1 tr\u00ecnh nguy\u00ean ph\u00e2n l\u00e0 \u0111\u1ed9ng v\u1eadt nguy\u00ean sinh. \u0110\u1ed9ng v\u1eadt nguy\u00ean sinh ph\u00e2n b\u00e0o theo c\u00e1ch tr\u1ef1c ph\u00e2n (kh\u00f4ng c\u00f3 thoi ph\u00e2n b\u00e0o). 20. Nh\u1eadn x\u00e9t n\u00e0o d\u01b0\u1edbi \u0111\u00e2y v\u1ec1 m\u1ed1i quan h\u1ec7 gi\u1eefa sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a c\u01a1 th\u1ec3 s\u1ed1ng l\u00e0 kh\u00f4ng \u0111\u00fang? Trang 3\/6","A. S\u1ef1 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a c\u01a1 th\u1ec3 lu\u00f4n li\u00ean quan B. Ba giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n ch\u00ednh l\u00e0 giai m\u1eadt thi\u1ebft v\u1edbi nhau, \u0111an xen l\u1eabn nhau v\u00e0 lu\u00f4n lu\u00f4n li\u00ean \u0111o\u1ea1n h\u1ee3p t\u1eed, giai \u0111o\u1ea1n ph\u00f4i v\u00e0 giai \u0111o\u1ea1n h\u1eadu ph\u00f4i. quan \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng s\u1ed1ng. D. T\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng di\u1ec5n ra kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u \u1edf c\u00e1c giai C. S\u1ef1 sinh tr\u01b0\u1edfng t\u1ea1o ti\u1ec1n \u0111\u1ec1 cho s\u1ef1 ph\u00e1t tri\u1ec3n. \u0111o\u1ea1n ph\u00e1t tri\u1ec3n kh\u00e1c nhau. Ph\u00e1t bi\u1ec3u sai l\u00e0 C, hai giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n ch\u00ednh l\u00e0 giai \u0111o\u1ea1n ph\u00f4i v\u00e0 giai \u0111o\u1ea1n h\u1eadu ph\u00f4i. 21. Sinh tr\u01b0\u1edfng \u1edf th\u1ef1c v\u1eadt l\u00e0 qu\u00e1 tr\u00ecnh B. t\u0103ng chi\u1ec1u d\u00e0i c\u01a1 th\u1ec3. A. t\u0103ng v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng c\u01a1 th\u1ec3. D. t\u0103ng v\u1ec1 chi\u1ec1u ngang c\u01a1 th\u1ec3. C. t\u0103ng v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 k\u00edch th\u01b0\u1edbc c\u01a1 th\u1ec3. Sinh tr\u01b0\u1edfng \u1edf th\u1ef1c v\u1eadt l\u00e0 qu\u00e1 tr\u00ecnh t\u0103ng v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 k\u00edch th\u01b0\u1edbc c\u01a1 th\u1ec3. 22. Lo\u1ea1i m\u00f4 ph\u00e2n sinh n\u00e0o sau \u0111\u00e2y kh\u00f4ng c\u00f3 \u1edf c\u00e2y m\u1ed9t l\u00e1 m\u1ea7m? A. M\u00f4 ph\u00e2n sinh \u0111\u1ec9nh r\u1ec5. B. M\u00f4 ph\u00e2n sinh \u0111\u1ec9nh c\u00e2y. C. M\u00f4 ph\u00e2n sinh b\u00ean. D. M\u00f4 ph\u00e2n sinh l\u1ecfng. C\u00e2y 1 l\u00e1 m\u1ea7m kh\u00f4ng c\u00f3 m\u00f4 ph\u00e2n sinh b\u00ean n\u00ean kh\u00f4ng c\u00f3 sinh tr\u01b0\u1edfng th\u1ee9 c\u1ea5p. 23. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0o kh\u00f4ng c\u00f3 \u1edf hormone th\u1ef1c v\u1eadt? B. T\u00ednh chuy\u00ean ho\u00e1 cao h\u01a1n nhi\u1ec1u so v\u1edbi hormone \u1edf \u0111\u1ed9ng v\u1eadt b\u1eadc cao. A. \u0110\u01b0\u1ee3c v\u1eadn chuy\u1ec3n theo m\u1ea1ch g\u1ed7 v\u00e0 m\u1ea1ch r\u00e2y. D. V\u1edbi n\u1ed3ng \u0111\u1ed9 r\u1ea5t th\u1ea5p g\u00e2y ra nh\u1eefng bi\u1ebfn \u0111\u1ed5i m\u1ea1nh C. \u0110\u01b0\u1ee3c t\u1ea1o ra m\u1ed9t n\u01a1i nh\u01b0ng g\u00e2y ra ph\u1ea3n \u1ee9ng \u1edf n\u01a1i trong c\u01a1 th\u1ec3. kh\u00e1c. \u0110\u1eb7c \u0111i\u1ec3m chung: \u0110\u01b0\u1ee3c t\u1ea1o ra \u1edf m\u1ed9t n\u01a1i nh\u01b0ng g\u00e2y ra ph\u1ea3n \u1ee9ng \u1edf m\u1ed9t n\u01a1i kh\u00e1c trong c\u00e2y. V\u1edbi n\u1ed3ng \u0111\u1ed9 r\u1ea5t th\u1ea5p nh\u01b0ng g\u00e2y ra nh\u1eefng bi\u1ebfn \u0111\u1ed5i m\u1ea1nh trong c\u01a1 th\u1ec3. T\u00ednh chuy\u00ean ho\u00e1 th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi hoocm\u00f4n \u1edf \u0111\u1ed9ng v\u1eadt b\u1eadc cao. 24. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n di\u1ec5n ra \u0111\u1ecbnh k\u00ec v\u00e0 \u0111i\u1ec1u ho\u00e0 \u1edf m\u1ed7i lo\u00e0i l\u00e0 do y\u1ebfu t\u1ed1 A. hormone. B. nhi\u1ec7t \u0111\u1ed9. C. ch\u1ea5t dinh d\u01b0\u1ee1ng. D. \u00e1nh s\u00e1ng. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n di\u1ec5n ra \u0111\u1ecbnh k\u00ec v\u00e0 \u0111i\u1ec1u ho\u00e0 \u1edf m\u1ed7i lo\u00e0i l\u00e0 do hormone \u0111i\u1ec1u ho\u00e0 sinh s\u1ea3n. 25. M\u1ed9t c\u01a1 th\u1ec3 v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed \u0111\u1ef1c, v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed c\u00e1i th\u00ec g\u1ecdi l\u00e0 A. c\u01a1 th\u1ec3 l\u01b0\u1ee1ng t\u00ednh. B. th\u1ec3 l\u01b0\u1ee1ng c\u1ef1c. C. th\u1ec3 song nh\u1ecb b\u1ed9i. D. c\u01a1 th\u1ec3 l\u01b0\u1ee1ng b\u1ed9i. M\u1ed9t c\u01a1 th\u1ec3 v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed \u0111\u1ef1c, v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o giao t\u1eed c\u00e1i l\u00e0 c\u01a1 th\u1ec3 l\u01b0\u1ee1ng t\u00ednh. 26. Hoa th\u1ee5 ph\u1ea5n nh\u1edd s\u00e2u b\u1ecd c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt l\u00e0 g\u00ec? B. Kh\u00f4ng c\u00f3 h\u01b0\u01a1ng th\u01a1m. A. Tr\u00e0ng l\u1edbn v\u00e0 c\u00f3 m\u00e0u s\u1eafc r\u1ea5t s\u1eb7c s\u1ee1. D. V\u00f2i nh\u1ecb r\u1ea5t d\u00e0i. C. Th\u01b0\u1eddng kh\u00f4ng m\u1ecdc th\u00e0nh c\u1ee5m. Hoa th\u1ee5 ph\u1ea5n nh\u1edd s\u00e2u b\u1ecd ph\u1ea3i c\u00f3 m\u00f9i th\u01a1m, m\u00e0u s\u1eafc s\u1eb7c s\u1ee1, tr\u00e0ng l\u1edbn \u0111\u1ec3 thu h\u00fat c\u00f4n tr\u00f9ng. VD: Hoa b\u01b0\u1edfi, hoa b\u00ed ng\u00f4, \u2026. 27. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0o kh\u00f4ng \u0111\u00fang v\u1edbi sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt? B. T\u1ea1o ra s\u1ed1 l\u01b0\u1ee3ng l\u1edbn con ch\u00e1u trong th\u1eddi gian ng\u1eafn. A. \u0110\u1ea3m b\u1ea3o s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u1ec1 m\u1eb7t di truy\u1ec1n qua c\u00e1c th\u1ebf h\u1ec7 c\u01a1 th\u1ec3. D. C\u00e1 th\u1ec3 c\u00f3 th\u1ec3 s\u1ed1ng \u0111\u1ed9c l\u1eadp, \u0111\u01a1n l\u1ebb v\u1eabn sinh s\u1ea3n b\u00ecnh C. C\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi cao v\u1edbi s\u1ef1 thay \u0111\u1ed5i c\u1ee7a \u0111i\u1ec1u th\u01b0\u1eddng. ki\u1ec7n m\u00f4i tr\u01b0\u1eddng. C\u00e1c c\u00e1 th\u1ec3 sinh ra t\u1eeb sinh s\u1ea3n v\u00f4 t\u00ednh c\u00f3 ki\u1ec3u gen gi\u1ed1ng nhau v\u00e0 gi\u1ed1ng c\u01a1 th\u1ec3 m\u1eb9 n\u00ean khi m\u00f4i tr\u01b0\u1eddng thay \u0111\u1ed5i c\u00f3 th\u1ec3 b\u1ecb ch\u1ebft h\u00e0ng lo\u1ea1t \u2192 kh\u00f4ng th\u00edch nghi t\u1ed1t v\u1edbi m\u00f4i tr\u01b0\u1eddng. 28. T\u1ea1i sao t\u1eafm n\u1eafng v\u00e0o l\u00fac \u00e1nh s\u00e1ng y\u1ebfu c\u00f3 l\u1ee3i cho s\u1ef1 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a tr\u1ebb nh\u1ecf? Trang 4\/6","A. V\u00ec tia t\u1eed ngo\u1ea1i l\u00e0m cho ti\u1ec1n vitamin D bi\u1ebfn th\u00e0nh B. V\u00ec tia t\u1eed ngo\u1ea1i l\u00e0m cho ti\u1ec1n vitamin D bi\u1ebfn th\u00e0nh vitamin D c\u00f3 vai tr\u00f2 chuy\u1ec3n ho\u00e1 Ca \u0111\u1ec3 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng. vitamin D c\u00f3 vai tr\u00f2 chuy\u1ec3n ho\u00e1 K \u0111\u1ec3 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng. C. V\u00ec tia t\u1eed ngo\u1ea1i l\u00e0m cho ti\u1ec1n vitamin D bi\u1ebfn th\u00e0nh D. V\u00ec tia t\u1eed ngo\u1ea1i l\u00e0m cho ti\u1ec1n vitamin D bi\u1ebfn th\u00e0nh vitamin D c\u00f3 vai tr\u00f2 \u00f4xy ho\u00e1 \u0111\u1ec3 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng. vitamin D c\u00f3 vai tr\u00f2 chuy\u1ec3n ho\u00e1 Na \u0111\u1ec3 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng. D\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tia t\u1eed ngo\u1ea1i, ti\u1ec1n vitamin D chuy\u1ec3n th\u00e0nh vitamin D c\u00f3 vai tr\u00f2 chuy\u1ec3n ho\u00e1 Ca \u0111\u1ec3 h\u00ecnh th\u00e0nh x\u01b0\u01a1ng n\u00ean vi\u1ec7c t\u1eafm n\u1eafng v\u00e0o l\u00fac \u00e1nh s\u00e1ng y\u1ebfu c\u00f3 l\u1ee3i cho s\u1ef1 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a tr\u1ebb nh\u1ecf. 29. Tr\u01b0\u1eddng h\u1ee3p \u1ea5u tr\u00f9ng ph\u00e1t tri\u1ec3n ch\u01b0a ho\u00e0n thi\u1ec7n, tr\u1ea3i qua nhi\u1ec1u l\u1ea7n l\u1ed9t x\u00e1c n\u00f3 bi\u1ebfn th\u00e0nh con tr\u01b0\u1edfng th\u00e0nh l\u00e0 s\u1ef1 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt qua h\u00ecnh th\u1ee9c n\u00e0o? A. Kh\u00f4ng qua bi\u1ebfn th\u00e1i. B. L\u1ed9t x\u00e1c. C. Bi\u1ebfn th\u00e1i ho\u00e0n to\u00e0n. D. Bi\u1ebfn th\u00e1i kh\u00f4ng ho\u00e0n to\u00e0n. Sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a \u0111\u1ed9ng v\u1eadt qua bi\u1ebfn th\u00e1i kh\u00f4ng ho\u00e0n to\u00e0n l\u00e0: Tr\u01b0\u1eddng h\u1ee3p \u1ea5u tr\u00f9ng ph\u00e1t tri\u1ec3n ch\u01b0a ho\u00e0n thi\u1ec7n, tr\u1ea3i qua nhi\u1ec1u l\u1ea7n l\u1ed9t x\u00e1c n\u00f3 bi\u1ebfn th\u00e0nh con tr\u01b0\u1edfng th\u00e0nh. VD: \u1ede ch\u00e2u ch\u1ea5u, con non c\u00f3 h\u00ecnh th\u00e1i g\u1ea7n gi\u1ed1ng v\u1edbi con tr\u01b0\u1edfng th\u00e0nh nh\u01b0ng kh\u00f4ng c\u00f3 c\u00e1nh, sau nhi\u1ec1u l\u1ea7n l\u1ed9t x\u00e1c, ch\u00fang tr\u1edf th\u00e0nh con tr\u01b0\u1edfng th\u00e0nh. 30. Sinh s\u1ea3n v\u00f4 t\u00ednh kh\u00f4ng t\u1ea1o th\u00e0nh A. h\u1ee3p t\u1eed. B. giao t\u1eed. C. c\u00e2y con. D. b\u00e0o t\u1eed. Sinh s\u1ea3n v\u00f4 t\u00ednh kh\u00f4ng th\u1ec3 t\u1ea1o th\u00e0nh h\u1ee3p t\u1eed v\u00ec kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. 31. M\u00f4 ph\u00e2n sinh \u0111\u1ec9nh kh\u00f4ng c\u00f3 \u1edf v\u1ecb tr\u00ed n\u00e0o c\u1ee7a c\u00e2y? A. \u1ede \u0111\u1ec9nh r\u1ec5. B. \u1ede th\u00e2n. C. \u1ede ch\u1ed3i \u0111\u1ec9nh. D. \u1ede ch\u1ed3i n\u00e1ch. M\u00f4 ph\u00e2n sinh \u0111\u1ec9nh kh\u00f4ng c\u00f3 \u1edf th\u00e2n, M\u00f4 ph\u00e2n sinh \u0111\u1ec9nh ch\u1ec9 c\u00f3 \u1edf \u0111\u1ea7u r\u1ec5, \u0111\u1ea7u ng\u1ecdn. 32. C\u01a1 s\u1edf t\u1ebf b\u00e0o h\u1ecdc c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng sinh tr\u01b0\u1edfng l\u00e0 A. qu\u00e1 tr\u00ecnh t\u0103ng l\u00ean v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng t\u1ebf b\u00e0o. B. s\u1ef1 nguy\u00ean ph\u00e2n c\u1ee7a c\u00e1c t\u1ebf b\u00e0o m\u00f4 ph\u00e2n sinh. C. s\u1ef1 gi\u1ea3m ph\u00e2n c\u1ee7a c\u00e1c t\u1ebf b\u00e0o m\u00f4 ph\u00e2n sinh. D. qu\u00e1 tr\u00ecnh t\u0103ng l\u00ean v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng t\u1ebf b\u00e0o. C\u01a1 s\u1edf t\u1ebf b\u00e0o h\u1ecdc c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng sinh tr\u01b0\u1edfng l\u00e0 s\u1ef1 nguy\u00ean ph\u00e2n c\u1ee7a c\u00e1c t\u1ebf b\u00e0o m\u00f4 ph\u00e2n sinh. 33. \u1ede tr\u1ebb em, n\u1ebfu c\u01a1 th\u1ec3 d\u01b0 th\u1eeba lo\u1ea1i hormone n\u00e0o sau \u0111\u00e2y th\u00ec s\u1ebd g\u00e2y b\u1ec7nh kh\u1ed5ng l\u1ed3? A. Hormone insulin. B. Hormone glucagon. C. Hormone sinh tr\u01b0\u1edfng (GH). D. Hormone tiroxin. GH l\u00e0 hormone do tuy\u1ebfn y\u00ean ti\u1ebft ra c\u00f3 t\u00e1c d\u1ee5ng k\u00edch th\u00edch qu\u00e1 tr\u00ecnh ph\u00e2n chia t\u1ebf b\u00e0o v\u00e0 t\u0103ng k\u00edch th\u01b0\u1edbc c\u1ee7a t\u1ebf b\u00e0o b\u1eb1ng c\u00e1ch t\u0103ng t\u1ed5ng h\u1ee3p protein. K\u00edch th\u00edch ph\u00e1t tri\u1ec3n x\u01b0\u01a1ng. N\u1ebfu c\u01a1 th\u1ec3 tr\u1ebb em d\u01b0 th\u1eeba hormone GH th\u00ec qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n x\u01b0\u01a1ng di\u1ec5n ra nhanh d\u1eabn t\u1edbi g\u00e2y hi\u1ec7n t\u01b0\u1ee3ng ng\u01b0\u1eddi kh\u1ed5ng l\u1ed3. 34. Sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n B. c\u1ea7n 2 c\u00e1 th\u1ec3. A. kh\u00f4ng c\u00f3 s\u1ef1 h\u1ee3p nh\u1ea5t gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. D. c\u00f3 s\u1ef1 h\u1ee3p nh\u1ea5t gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. C. ch\u1ec9 c\u1ea7n giao t\u1eed c\u00e1i. Sinh s\u1ea3n v\u00f4 t\u00ednh l\u00e0 h\u00ecnh th\u1ee9c sinh s\u1ea3n kh\u00f4ng c\u00f3 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa giao t\u1eed \u0111\u1ef1c v\u00e0 giao t\u1eed c\u00e1i. 35. Trong thi\u00ean nhi\u00ean c\u00e2y tre c\u00f3 th\u1ec3 sinh s\u1ea3n b\u1eb1ng A. r\u1ec5 ph\u1ee5. B. th\u00e2n b\u00f2. C. l\u00f3ng. D. th\u00e2n r\u1ec5. Ngo\u00e0i t\u1ef1 nhi\u00ean c\u00e2y tre sinh s\u1ea3n b\u1eb1ng th\u00e2n r\u1ec5. Tre l\u00e0 c\u00e2y M\u1ed9t l\u00e1 m\u1ea7m sinh s\u1ea3n sinh d\u01b0\u1ee1ng b\u1eb1ng th\u00e2n r\u1ec5, c\u00e2y con m\u1ecdc \u00e1p s\u00e1t ngay c\u1ea1nh c\u00e2y m\u1eb9 t\u1ea1o n\u00ean m\u1ed9t qu\u1ea7n th\u1ec3 tre ch\u1ee9 kh\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t c\u00e1 th\u1ec3 \u0111\u1ee9ng ri\u00eang l\u1ebb. 36. Sinh tr\u01b0\u1edfng c\u1ee7a c\u01a1 th\u1ec3 \u0111\u1ed9ng v\u1eadt l\u00e0 qu\u00e1 tr\u00ecnh t\u0103ng k\u00edch th\u01b0\u1edbc c\u1ee7a B. c\u00e1c m\u00f4 trong c\u01a1 th\u1ec3. A. c\u01a1 th\u1ec3 do t\u0103ng k\u00edch th\u01b0\u1edbc v\u00e0 s\u1ed1 l\u01b0\u1ee3ng t\u1ebf b\u00e0o. D. c\u00e1c c\u01a1 quan trong c\u01a1 th\u1ec3. C. c\u00e1c h\u1ec7 c\u01a1 quan trong c\u01a1 th\u1ec3. Sinh tr\u01b0\u1edfng c\u1ee7a c\u01a1 th\u1ec3 \u0111\u1ed9ng v\u1eadt l\u00e0 qu\u00e1 tr\u00ecnh t\u0103ng k\u00edch th\u01b0\u1edbc c\u1ee7a c\u01a1 th\u1ec3 do t\u0103ng k\u00edch th\u01b0\u1edbc v\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u1ee7a t\u1ebf b\u00e0o. 37. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n h\u1eefu t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt g\u1ed3m c\u00e1c giai \u0111o\u1ea1n? Trang 5\/6","A. H\u00ecnh th\u00e0nh giao t\u1eed, th\u1ee5 tinh, ph\u00e1t tri\u1ec3n ph\u00f4i thai. B. Th\u1ee5 tinh v\u00e0 ph\u00e1t tri\u1ec3n ph\u00f4i thai. C. H\u00ecnh th\u00e0nh giao t\u1eed v\u00e0 th\u1ee5 tinh. D. H\u00ecnh th\u00e0nh giao t\u1eed, th\u1ee5 t\u00ednh, t\u1ea1o th\u00e0nh h\u1ee3p t\u1eed. Qu\u00e1 tr\u00ecnh sinh s\u1ea3n h\u1eefu t\u00ednh \u1edf \u0111\u1ed9ng v\u1eadt g\u1ed3m 3 giai \u0111o\u1ea1n: h\u00ecnh th\u00e0nh giao t\u1eed, th\u1ee5 tinh, ph\u00e1t tri\u1ec3n ph\u00f4i thai. 38. Sinh s\u1ea3n v\u00f4 t\u00ednh d\u1ef1a tr\u00ean c\u01a1 s\u1edf A. ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m. B. ph\u00e2n b\u00e0o gi\u1ea3m nhi\u1ec5m. C. ph\u00e2n b\u00e0o gi\u1ea3m nhi\u1ec5m, ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m v\u00e0 th\u1ee5 D. ph\u00e2n b\u00e0o gi\u1ea3m nhi\u1ec5m v\u00e0 ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m. tinh. Sinh s\u1ea3n v\u00f4 t\u00ednh d\u1ef1a tr\u00ean c\u01a1 s\u1edf ph\u00e2n b\u00e0o nguy\u00ean nhi\u1ec5m (Nguy\u00ean ph\u00e2n). 39. Cho c\u00e1c v\u00ed d\u1ee5 v\u1ec1 sinh s\u1ea3n v\u00f4 t\u00ednh \u1edf th\u1ef1c v\u1eadt nh\u01b0 sau: (1) Rau m\u00e1 sinh s\u1ea3n b\u1eb1ng th\u00e2n b\u00f2. (2) R\u00eau sinh s\u1ea3n b\u1eb1ng th\u00e2n r\u1ec5. (3) C\u1ecf g\u1ea5u sinh s\u1ea3n b\u1eb1ng th\u00e2n b\u00f2. (4) Khoai t\u00e2y sinh s\u1ea3n b\u1eb1ng r\u1ec5 c\u1ee7. (5)C\u00e2y s\u1ed1ng \u0111\u1eddi sinh s\u1ea3n b\u1eb1ng l\u00e1. C\u00f3 bao nhi\u00eau ph\u01b0\u01a1ng \u00e1n \u0111\u00fang? A. 2. B. 4. C. 5. D. 3. Ph\u00e1t bi\u1ec3u \u0111\u00fang l\u00e0: (1), (5). (2) sai. R\u00eau sinh s\u1ea3n b\u1eb1ng b\u00e0o t\u1eed. (3) sai. C\u1ecf g\u1ea5u sinh s\u1ea3n b\u1eb1ng th\u00e2n r\u1ec5. (4) sai. Khoai t\u00e2y sinh s\u1ea3n b\u1eb1ng th\u00e2n c\u1ee7. 40. Bi\u1ec7n ph\u00e1p hi\u1ec7u qu\u1ea3 nh\u1ea5t \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t th\u1ee5 tinh l\u00e0 B. s\u1eed d\u1ee5ng hoocm\u00f4n ho\u1eb7c ch\u1ea5t k\u00edch t\u1ed5ng h\u1ee3p. A. nu\u00f4i c\u1ea5y ph\u00f4i. D. th\u1ee5 tinh nh\u00e2n t\u1ea1o. C. thay \u0111\u1ed5i c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng. Th\u1ee5 tinh nh\u00e2n t\u1ea1o c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m t\u0103ng hi\u1ec7u qu\u1ea3 th\u1ee5 tinh, c\u00f3 th\u1ec3 di\u1ec5n ra b\u00ean trong ho\u1eb7c b\u00ean ngo\u00e0i c\u01a1 th\u1ec3. Th\u1ee5 tinh nh\u00e2n t\u1ea1o c\u00f3 th\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t 80-90% so v\u1edbi 40% khi th\u1ee5 tinh trong \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean. Trang 6\/6"]