Solution of Chapter 2. Components of Food (NCERT - Science Exemplar Book)

Which one of the following food item does not provide dietary fiber?

Which of the following sources of protein is different from others?

Which of the following nutrients is not present in milk?

Read the food item given below:

(a) Wheat

(b) Ghee

(c) Iodised salt

(d) Spinach (palak)

Which of the above food items are energy giving food?

Which of the following statement about diseases.

(i) They are caused by germs.

(ii) They are caused due to lack of nutrients in our diet

(iii) They can be passed on to another person through contact.

(iv) They can be prevented by taking a balanced diet.

Which pair of statements best describes a deficiency disease?

Given below are the steps to test the presence of proteins in a food item:

(i) Take a small quantity of the food item in a test tube, add 10 drops of water to it shake it.

(ii) Make a paste or powder of food to be tested.

(iii) Add 10 drops of caustic soda solution to the test tube and shake well.

(iv)Add 2 drops of copper sulphate solution to it.

Which of the following is the correct sequence of the steps?

Unscramble the following words related to components of food and write them in the space provided.

Which of the following food items does not provide any nutrient?

Milk, Water, Orange juice, Tomato soup

Fill in the blanks from the list of words given below:

(carbohydrate, fat, protein, starch, sugar, vitamin A, vitamin C, roughage, balanced diet, obesity, goitre)

(a) Egg yolk is rich in …………………. And egg albumin is rich in ……………….. .

(b) Deficiency diseases can be prevented by taking a …………………. .

(c) Eating too much of fat rich food may lead to a condition called ……………. .

(d) The component of food that does not provide any nutrient to our body and yet is essential in our food is ………………. .

(e) The vitamin that gets destroyed by heating during cooking is ……………….. .

Read the items of food listed below. Classify them into carbohydrate rich, protein rich and fat food and fill them in the given table.

Moong dal, fish, mustard oil, sweet potato, milk, rice, egg, beans, butter, butter milk (chhach), cottage cheese (paneer). Peas, maize, white bread.

Tasty food is not always nutritious and nutritious food may not always be tasty to eat. Comment with examples.

While using iodine in the laboratory, some drops of iodine fell on Paheli’s socks and some fell on her teacher’s saree. The drops of iodine on the saree turned blue black while their color did not change on the socks. What can be the possible reason?

Paheli and Boojho peeled some potatoes and cut them into small pieces. They washed and boiled them in water. They threw away the excess water and fried and fried them in oil adding salt and spices. Although the potato dish tasted very good. Its nutrient value was less. Suggest a method of cooking potatoes that will not lower the nutrients in them.

Paheli avoids eating vegetables but liked to eat biscuits, noodles and white bread. She frequently complains of stomachache and constipation. What are the food item that she should include in her diet to get rid of the problem? Give reason for your answer.

(a) List all those components of food that provide nutrients.

(b) Mention two components of food to not provide nutrients.

‘Mineral and vitamins are needed in very small quantities by our body as compared to other components, yet, they are an important part of a balanced diet.’ Explain the statements.

‘Water does not provide nutrients, yet it is an important component of food.’ Explain?

Boojho was having difficulty in seeing thing in dim light. The doctor tested his eyesight and prescribed a prescribed a particular vitamin supplement. He also advised him to include a few food items in his diet.

(a) Which deficiency disease is he suffering from?

(b) Which food component may be lacking in his diet?

(c) Suggest some food items that he should include in his diet. (Any four)

Solve the cross-word puzzle gi9ven as Fig. 2.1 from the clues given below.

Across

1. Lack of nutrients in our diet over a long period causes these diseases (10)

2. Rice and potato are rich in this type of carbohydrate (6)

3. Deficiency disease in bones making it become soft and bent (7)

4. The diet that provides all the nutrients that our body needs, in right quantites, along with adequate amount of roughage and water (8. 4)

5. Deficiency disease with bleeding gums (6)

6. Disease caused due to deficiency of iodine (6)

Down

7. Starch and sugar in our food are rich in this type of energy giving nutrient (13)

8. The term given to the useful components of food (9)

9. The disease caused by deficiency of iron in diet (7)

10. Green leafy vegetables, liver and apples are rich in this mineral (4)

11. Deficiency disease caused due to lack of vitamin B₁ in the diet (8)

Observed the items given in Fig. 2.2 carefully and answer the question that follow.

(a) Food item rich in carbohydrates is ………(i)………….

(b) Egg is a rich source of protein, the mineral ………(ii)…… and vitamin ….(iii)……..

(c) …..(iv)…. Is a rich source of fat.

(d) Milk provides …….(v)……, vitamin D and ….(vi)…… (mineral)

(e) …..(vii)…. (fruit) is a rich sources of vitamin A.

(f) Spinach is a good sources of the mineral …..(viii)……. .

(g) Both eggs and ….(xi)…. Are rich in ….(x)….. .

SNAKES AND LADDERS

Make a bond-game just like ‘snakes and ladder’ with 10 10 grid boxes.

The mouth of the snake will represent the faulty food habit or faulty method of cooking. Its tail will represent the deficiency disease caused or loss of any nutrient in food.

Similarly, the box at the base of a ladder will represent healthy food habit or healthy method of cooking. Its upper end will represent the beneficial effect of that habit. An example is given as Fig. 2.3. Complete the board and with your friends.