(a) Carbohydrates are the compounds made up of carbon, hydrogen and oxygen. These are formed in plants during photosynthesis, e.g., glucose.
(b) Carbohydrates found in our food are in the form of starch and sugar.

(a) No, fats, proteins and starch are not present in all food items. Some food items have fat, some have protein or starch or some have varying proportions of these nutrients.
(b) Yes, food items such as cooked pulse, milk, groundnut etc contain more than one nutrient.
(c) Yes, food items like a slice of vegetable or fruit do not contain any of these three nutrients.

(a) Carbohydrates and fats mainly give energy to our body.
(b) Proteins and minerals are needed for growth and maintenance of our body.
(c) Vitamin-A is required for maintaining good eyesight.
(d) Calcium is a mineral that is required for keeping our bones healthy.

The complete filled table is

(a) Vitamins and minerals
(b) Tea, coffee, fruits, vegetables etc.
(c) Vegetables contain vitamins and minerals
which get washed away if vegetables are washed after cutting them.
Food should not be overcooked to prevent the loss of nutrients from it.

The presence of proteins in food items is tested by using following steps :
Step I: Take a small quantity of food item in a test-tube.
Step II: Add 10 drops of water into it and shake the test-tube
Step III: With the help of dropper, add two drops of copper sulphate solution.
Step IV: Add 10 drops of caustic soda solution to the test-tube and shake the test tube and leave it for a few minutes.
The appearance of violet colour indicates the presence of proteins in the food item.

(a) chapati
(b) calcium,  D
(c) Butter
(d) protein,  calcium
(e) Papaya
(f) iron
(g) peas, proteins.

(a) The main sources of calcium minerals are milk, cheese, eggs and green vegetables. It also found in flour and bread.
It helps in formation of bone, teeth and blood clotting.
(b) Magnesium is found in cheese, green vegetable, bread and fish.
It helps in energy transfer and muscles activity. It works with calcium and vitamin-C.
(c) Potassium is found in meat, fruit, eggs, milk, etc.
The main function of potassium is balance in tissue fluid and blood. It also helps in nerve impulse conduction.
(d) Zinc is mainly found in onions, liver and green vegetables.
It works as a enzyme activator in our body.
(e) Iron is found in green vegetables, fresh fruits, etc.
Iron is needed to make haemoglobin present in red blood cells which carry oxygen from the lungs to the body parts.

(a) Manvi had not eaten any food since morning. She was tired as no energy giving food has been eaten by her. Lack of food leads to no energy and restlessness.
(b) The components present in food are carbohydrates, proteins, vitamins, fats and minerals.
Carbohydrates and fats are energy yielding components in food.
(c) Manvi is humble, fun loving girl who realised her mistakes. She respects her olders and tries to follow instructions given by them.

(a) Many vegetables contain most of the nutrients just below their skin surface. Thick peeling may lead to their removal.
(b) Washing of vegetables after peeling or cutting removes the water soluble vitamins and minerals from them and lowers their nutritive value.
(c) These components are called nutrients like minerals (iron, calcium, phosporous) and vitamins (B, A, C, D, E).
(d) Vegetables like tomatoes, potatoes, green leafy vegetables, etc.
(e) Yes, Radha is sincere, observant, helpful and knowledgeable. She used her knowledge in right place and stopped her mother for doing incorrect work.