202110649-PINNACLE-STUDENT-WORKBOOK-SCIENCE-G05-TERM2

by classklap SCIENCE WORKBOOK - TERM 2 Enhanced Edition 5 Name: ___________________________________ Section: ________________ Roll No.: _________ School: __________________________________ PNC_G5_SCI_T2_WB_QC4.indb 1 12-Sep-19 5:50:34 PM

Lesson Name Page No. 1) Food 1 2) Water 11 3) Plants 20 29 Inside the Lab 33 Term Project PNC_G5_SCI_T2_WB_QC4.indb 2 12-Sep-19 5:50:36 PM

Lesson 1: Food Concept Map Food Methods of food ________________ (1) Causes of food spoilage drying, freezing, salting, boiling, canning, air and oxygen, moisture, enzymes, adding preservatives, irradiation microorganisms, light and temperature Diseases Microorganisms present in spoiled food may cause foodborne diseases. Types ___________ (2) – People with BMI over infectious diseases, hereditary 30 kg/m2 are obese. diseases, physiological diseases, excessive food intake _________________ (3) diseases lack of physical exercise genetic reasons Causes Food pyramid – designed to help metabolic factor, genetic factor, in healthy eating microorganisms, nutritional factor, balanced diet – a diet having all the environmental factor nutrients that our body needs major food items carbohydrates – whole grains, vegetables, and so on _____________(4) – legumes, fish, eggs, and so on fats – egg yolks, meat, and so on Kitchen Safety The equipment and the environment in the We should follow certain do’s and don’ts to kitchen may be a little dangerous. be safe in the kitchen. We should be cautious and careful while in the kitchen. 1 PNC_G5_SCI_T2_WB_QC4.indb 1 12-Sep-19 5:50:37 PM

Remembering Multiple Choice Questions (1M per question) 1) Name the type of fire extinguisher used in the case of a ‘Class - B’ fire. [    ] (A) carbon dioxide  (B) water  (C) dry chemicals  (D)  both (A) and (B) 2) ______________ diseases are caused by microorganisms. [    ] (A) Hereditary   (B) Physiological   (C) Infectious   (D) Deficiency Fill in the Blanks (1M per question) 3) Microorganisms in milk can be killed by ____________. 4) Goitre is caused by the deficiency of ___________ in our food or diet. Match the Following (5M) 5) a) food spoilage 6) b) food pyramid 7) c) deficiency disease 8) d) cause of obesity 9) e) food preservation method Ans. ________________________________________________________________________________ 2 PNC_G5_SCI_T2_WB_QC4.indb 2 12-Sep-19 5:50:46 PM

Very Short Answer Questions (1M per question) 10) Give the full form of BMI. Ans. ________________________________________________________________________________ 11) Define spoilage of food. (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ 12) Name any two chemical preservatives. Ans. ________________________________________________________________________________ 13) Define deficiency disease. (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ Understanding Very Short Answer Questions (1M per question) 14) Which of the given food item/s can be grouped at the base of a food pyramid? rice, meat, potatoes, eggs, milk, nuts, saturated oil, whole grains, wheat bread Ans. ________________________________________________________________________________ 15) What is known as balanced diet? (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ 16) Kanishk’s body weight is normal, but he suffers from a heart disease. Give the possible cause for this. Ans. ________________________________________________________________________________ ________________________________________________________________________________ Food 3 PNC_G5_SCI_T2_WB_QC4.indb 3 12-Sep-19 5:50:47 PM

Short Answer Questions (3M per question) 17) Write any three activities that may lead to a gas leakage in the kitchen. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 18) Differentiate between infectious diseases and physiological diseases by giving suitable examples. Ans. Infectious diseases Physiological diseases Long Answer Questions (4M per question) 19) What is the purpose of food preservation? (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 4 12-Sep-19 5:50:47 PM PNC_G5_SCI_T2_WB_QC4.indb 4

20) Explain the different types of food. (Textbook, Pg. 70) Ans. Food items Source ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Application Short Answer Questions (3M per question) 21) What should we do in case of minor burns? (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 22) Which method of preservation should we use to preserve fruits and vegetables for a long time? Why? Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Food 5 PNC_G5_SCI_T2_WB_QC4.indb 5 12-Sep-19 5:50:47 PM

23) How can we prevent obesity? (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 24) How can we avoid fires at any place? Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Long Answer Questions (4M per question) 25) The body weight of Shweta is 38 kg and her height is 125 cm, while the body weight of Reena is 36 kg and her height is 100 cm. Which of them has a higher BMI? Also, find out if any of the two is/are obese. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 6 PNC_G5_SCI_T2_WB_QC4.indb 6 12-Sep-19 5:50:47 PM

________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 26) Write about food preservation methods. (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 27) Write about kitchen safety. (Textbook, Pg. 70) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Food 7 PNC_G5_SCI_T2_WB_QC4.indb 7 12-Sep-19 5:50:48 PM

Higher Order Thinking Skills (H.O.T.S.) Short Answer Question (3M per question) 28) Fill in the missing information in the given table. Ans. Name of the vitamin/mineral Name of the disease a) Vitamin – B ______________________ b) _____________________ Haemorrhage c) Vitamin – A ______________________ d) Vitamin – D ______________________ e) ______________________ Sterility f) Vitamin – C ______________________ Long Answer Questions (4M per question) 29) Make your own ‘Food Pyramid’ by pasting the pictures of food items you eat daily during mealtime. Compare your food pyramid with the food pyramid given on textbook Pg. 67. Write a few do’s and don’ts that can be done to improve your food pyramid. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 8 12-Sep-19 5:50:48 PM PNC_G5_SCI_T2_WB_QC4.indb 8

Eat Less Eat Moderately Eat More Eat Most Food 9 PNC_G5_SCI_T2_WB_QC4.indb 9 12-Sep-19 5:50:48 PM

30) Listed below are some food items that are used commonly. Check out the packets of these food items (from nearby stores or in your home) and fill in the information given in the table below. Ans. Food items Date of expiry or period of expiry a) Packaged wheat flour b) Frozen peas c) Dairy milk chocolate d) Any biscuit e) Yoghurt f) Red chilli powder g) Cashew nuts h) Toned milk 10 12-Sep-19 5:50:48 PM PNC_G5_SCI_T2_WB_QC4.indb 10

Lesson 2: Water Concept Map Water Sources of water Water cycle river water, lake water, sea water, well ________________ (1) – Water is changed into water, spring water, underground water water vapour by the heat of the Sun. Condensation – Water vapour condenses Water pollution into water on cooling. Contamination of water bodies by human Precipitation – The bigger and heavier water activities is called water pollution. droplets fall as rain, hail or snow. Flowing back to oceans – Rainwater __________________ (2) of water pollution – forms streams and springs, which then join industrial waste, sewage, domestic waste, and form rivers that flow to the seas and chemical fertilizers and insecticides, synthetic oceans. detergents and oil spill Water management Prevention of water pollution freshwater management Avoid excess use of fertilizers and pesticides, wastewater management minimise the use of synthetic detergents and maximise the use of biodegradable ________________ (3) of sea water detergents, plant more trees and shrubs along the banks of rivers, do proper sewage treatment and so on. Waterborne diseases Illnesses caused by the __________________ (4) present in untreated or contaminated water are called waterborne diseases. E.g., Cholera, Dengue fever, Swine Flu PNC_G5_SCI_T2_WB_QC4.indb 11 11 12-Sep-19 5:50:49 PM

Remembering Multiple Choice Questions (1M per question) 1) Which of the following is not a waterborne disease? [    ] (A)  Typhoid (B)  Diarrhoea   (C)  Cholera (D)  Chicken pox 2) The process of converting water vapour into water by cooling is called [    ] (A) precipitation.  (B) condensation.  (C) evaporation.  (D) transpiration. Fill in the Blanks (1M per question) 3) The reservoir of water present on the hard rock below the soil is ________________ water. 4) Food waste, soaps and detergents, garbage, wrappers and so on are examples of ______________________ waste. Match the Following (5M) 5) a) well water 6) b) sewage 7) c) spring water 8) d) farm pond 9) e) sea water Ans. ________________________________________________________________________________ 12 PNC_G5_SCI_T2_WB_QC4.indb 12 12-Sep-19 5:51:02 PM

Very Short Answer Questions (1M per question) 10) Write down the sources of water. (Textbook, Pg. 82) Ans. ________________________________________________________________________________ 11) Name the organism responsible for the spread of Dengue fever. Ans. ________________________________________________________________________________ 12) What is water pollution? Ans. ________________________________________________________________________________ 13) What are the processes involved in water cycle? (Textbook, Pg. 82) Ans. ________________________________________________________________________________ ________________________________________________________________________________ 14) What is desalination? (Textbook, Pg. 82) Ans. ________________________________________________________________________________ ________________________________________________________________________________ Understanding Very Short Answer Questions (1M per question) 15) Choose the activity/activities related to fresh water management. rainwater harvesting, distillation, desalination, reverse osmosis, building farm ponds Ans. ________________________________________________________________________________ 16) Name one possible way by which pesticides like DDT may enter or reach the body of humans. Ans. ________________________________________________________________________________ Water 13 PNC_G5_SCI_T2_WB_QC4.indb 13 12-Sep-19 5:51:03 PM

Short Answer Questions (3M per question) 17) What are reservoirs? (Textbook, Pg. 82) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 18) Suggest any three advantages of wastewater treatment. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Long Answer Questions (4M per question) 19) Draw a well-labelled diagram of the water cycle. Ans. 14 12-Sep-19 5:51:03 PM PNC_G5_SCI_T2_WB_QC4.indb 14

20) Write the advantages of rainwater harvesting. (Textbook, Pg. 82) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Application Short Answer Questions (3M per question) 21) How can we prevent dengue fever? (Textbook, Pg. 82) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 22) How can industries lead to water pollution? Explain. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Long Answer Questions (4M per question) 23) How can we prevent waterborne diseases? (Textbook, Pg. 82) Ans. ________________________________________________________________________________ Water 15 L02_PNC_G5_SCI_T2_WB_QC4.indd 15 12-Sep-19 6:41:27 PM

________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 24) Give examples of any four waterborne diseases prevalent in your surroundings and mention their causative agents. Ans. Waterborne diseases Causative agents Higher Order Thinking Skills (H.O.T.S.) Short Answer Question (3M per question) 25) Complete the flow diagram given below and name the process it demonstrates. Ocean A B Drinking water C water Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 16 12-Sep-19 5:51:04 PM PNC_G5_SCI_T2_WB_QC4.indb 16

Long Answer Questions (4M per question) 26) a) Collect pictures of different sources of water pollution from newspapers or magazines and make a collage with them in the space provided below. Also, provide a suitable heading for your collage. Ans. Water 17 PNC_G5_SCI_T2_WB_QC4.indb 17 12-Sep-19 5:51:04 PM

b) Write slogans to prevent water pollution. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 18 12-Sep-19 5:51:04 PM PNC_G5_SCI_T2_WB_QC4.indb 18

27) Where do you live and from where do you get the water in your home? Draw the journey of water from its source to your home in the space provided below. Ans. Water 19 PNC_G5_SCI_T2_WB_QC4.indb 19 12-Sep-19 5:51:04 PM

Lesson 3: Plants Concept Map Plants Flower – reproductive part of the plant Reproduction in plants unisexual – sepals asexual – new plants produced from roots, papaya, corn petals stems, leaves or buds (1) ____________ sexual – new plants produced from seeds bisexual – rose, gynoecium mustard Pollination Agriculture transfer of pollen grains from anther to stigma types – _____________________ (2) and self cultivating crops like cereals, pollination vegetables, fruits and oilseeds agents of pollination – wind, water, insects, birds classroom agriculture – teaches the connection between agriculture and Fertilization the environment fusion of male and female gametes useful insects for agriculture – earthworm, honeybee, dragonfly Fruit and seed formation types of soil Ovary develops into fruits. Ovule develops into seeds. sandy (3) ________ dicotyledons – seed with two cotyledons loamy monocotyledons – seed with one cotyledon _______________________ (4) Life cycle of plants spreading of seeds from one place During favourable conditions, the seed germinates to another by different agents such and gives rise to a new seedling, which grows to form a mature plant. as wind, water, animals, birds and seed young plant mature plant flower fruit self-dispersal 20 12-Sep-19 5:51:06 PM PNC_G5_SCI_T2_WB_QC4.indb 20

Remembering Multiple Choice Questions (1M per question) 1) Balsam is an example of [    ] (A) anemochory.  (B) hydrochory.  (C) zoochory.  (D) autochory. 2) An example of monocotyledons is  [    ] (A)  pea. (B)  maize. (C)  bean.    (D)  castor. Fill in the Blanks (1M per question) 3) Sepals are usually _________________ in colour. 4) The zygote develops into an _________________. Match the Following (5M) 5) a) zoochory 6) b) autochory 7) c) hydrochory 8) d) dispersal by birds 9) e) anemochory Ans. ________________________________________________________________________________ Plants 21 PNC_G5_SCI_T2_WB_QC4.indb 21 12-Sep-19 5:51:19 PM

Very Short Answer Questions (1M per question) 10) What do you understand by the word ‘anemophily’? Ans. ________________________________________________________________________________ 11) Mention one characteristic of loamy soil. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 12) Mention the name of any one insect friend of farmers. Ans. ________________________________________________________________________________ 13) Name the two types of pollination. Ans. ________________________________________________________________________________ Understanding Very Short Answer Questions (1M per question) 14) How is soil formed? (Textbook, Pg. 93) Ans. ________________________________________________________________________________ 15) Mention the three parts of the gynoecium. Ans. ________________________________________________________________________________ 16) Define pollination. (Textbook, Pg. 93) Ans. ________________________________________________________________________________ ________________________________________________________________________________ 17) Which part of the flower is always colourful and attracts insects? Ans. ________________________________________________________________________________ 22 12-Sep-19 5:51:21 PM PNC_G5_SCI_T2_WB_QC4.indb 22

Short Answer Questions (3M per question) 18) What is known as vermi-compost? (Textbook, Pg. 93) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 19) What is germination of seed? (Textbook, Pg. 93) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 20) Differentiate between dicotyledons and monocotyledons and give suitable examples. Ans. Dicotyledons Monocotyledons 21) How are the seeds spread by water? (Textbook, Pg. 93) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Plants 23 PNC_G5_SCI_T2_WB_QC4.indb 23 12-Sep-19 5:51:21 PM

Long Answer Question (4M per question) 22) Write a note on the parts of plants. (Textbook, Pg. 93) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Application Short Answer Questions (3M per question) 23) Why do sandy soils tend to be light, well aerated and dry? Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 24 12-Sep-19 5:51:21 PM PNC_G5_SCI_T2_WB_QC4.indb 24

24) Draw the picture of a flower and label the parts. (Textbook, Pg. 93) Ans. Long Answer Question (4M per question) 25) Explain the methods of pollination. (Textbook, Pg. 93) Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ Plants 25 PNC_G5_SCI_T2_WB_QC4.indb 25 12-Sep-19 5:51:21 PM

Higher Order Thinking Skills (H.O.T.S.) Short Answer Question (3M per question) 26) Fill in the missing information. Ans. Colour of the petals Name of the pigment _____________________________ red, pink, blue, purple _____________________________ Carotenoids green _____________________________ Long Answer Questions (4M per question) 27) Some seeds are eaten along with the fruit as an edible part. Give some examples of such fruits. Also write the method of dispersion of seeds in such cases. Represent the dispersal journey of one such seed through a diagram. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 26 PNC_G5_SCI_T2_WB_QC4.indb 26 12-Sep-19 5:51:21 PM

Plants 27 PNC_G5_SCI_T2_WB_QC4.indb 27 12-Sep-19 5:51:21 PM

28) Which process in a plant results in the formation of an zygote? Explain the process of zygote formation with the help of a diagram. Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 12-Sep-19 5:51:22 PM 28 PNC_G5_SCI_T2_WB_QC4.indb 28

Inside the Lab Activity 1: Disease Prevention Charades Make sure you do these activities only with the help of a teacher or an adult. Let us learn some methods to prevent diseases by playing a fun-filled game. You will need: chart paper, marker, paper box, marksheet to mark the scores and a pair of scissors. You need to: a) divide the class into two teams – team A and team B. b) let both teams make disease prevention cards. c) cut out small cards from the chart paper. d) write various methods of prevention to keep us safe from diseases. e) put the cards inside the paper box and shuffle. f) ask one learner from team B to pick a card. The learner should then act out the method of prevention mentioned in the card without using any words. For enacting one card, give a time limit of 2 minutes. g) ask the other learners from team B to guess what method of prevention is being enacted. h) ask team A to check the time taken and write the scores on the marksheet. i) reverse the roles. Now, team A will enact and team B will record the time. PNC_G5_SCI_T2_WB_QC4.indb 29 29 12-Sep-19 5:51:23 PM

1) Discuss some preventive measures to overcome diseases. Ans. __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ Activity 2: Seed Germination We have learnt that seeds need moisture, air and the right amount of warmth to germinate and grow. Let us do a seed germination activity to find out whether the seeds need all these to germinate or not. You will need: bean seeds (15–20 per bowl), five clean and empty beakers (one for each condition), paper towels, water to wet the towels and masking tape to label the beakers. You need to: a) keep the seeds in the following conditions. How where beaker 1 Place the seeds on a wet paper towel. in air and light beaker 2 Place dry seeds. in air and light beaker 3 Pour water in the beaker. Put seeds in the water. in air and light beaker 4 Place the seeds on a wet paper towel. in a dark place beaker 5 Place the seeds on a wet paper towel. in a refrigerator 30 12-Sep-19 5:51:25 PM PNC_G5_SCI_T2_WB_QC4.indb 30

b) make predictions about what will happen. Note them down in your observation sheet. c) have a look at the beakers 7 to 10 days later. Note down your results in the observation table given below. The seeds of which beaker have germinated? Which have not? Note: • The seeds in the water will need to have their water changed regularly, so that mould growth does not take place. • Check once a day that the paper towel is wet. Observation table: Experiment Conditions Prediction Actual Result Actual Result number after ____ days after ____ days PNC_G5_SCI_T2_WB_QC4.indb 31 31 12-Sep-19 5:51:25 PM

1) Based on the above experiment, show the germination of a seed diagrammatically. Ans. 32 12-Sep-19 5:51:25 PM PNC_G5_SCI_T2_WB_QC4.indb 32

Term Project Salt from Seawater Let us see how we get salt from seawater due to the changing forms of water. You will need: salt, some tap water, a saucepan, a spoon, a stove, a tray seawater collected in ponds and a black plastic sheet. You need to: a) add two cups of water to the pan. Place it on the stove. Let the water boil. b) add salt to the hot water in the pan. Mix it well with a spoon. Salt dissolves faster in hot water. Continue adding salt until it stops dissolving in the hot water. Eventually, you will reach a point at which the salt will not dissolve anymore, no matter how hot the water is. When you reach that point, turn the stove off and let the water cool slightly. c) spread the black plastic sheet inside the tray. d) pour the water from the pan into the tray. e) keep the tray out in the Sun for two days. (The black plastic paper and tray location should be chosen wisely to protect the setup from any external damage.) The water will change into water vapour. This will leave behind crystals of salt in the tray. They are small and shiny. Salt is prepared from seawater in a similar way. Seawater changes into water vapour during summer, leaving behind salt. PNC_G5_SCI_T2_WB_QC4.indb 33 33 12-Sep-19 5:51:27 PM

1) Why is the sea or ocean salty? Ans. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ 34 12-Sep-19 5:51:28 PM PNC_G5_SCI_T2_WB_QC4.indb 34