Answer: Option A. -> A bowl of rice
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A
Carbohydrates and fats provide the body with energy it requires for carrying out its functions. Compared to carbohydrates, fats provide more energy but carbohydrates provides the energy faster than fats. So, of the given options, a bowl of rice would give Joy maximum energy.

Answer: Option A. -> Dilute iodine solution
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A
Food items like rice, potato, bread, etc., are rich in starch. After adding a few drops of dilute iodine solution to the sample of these food items, it develops a deep blue or blue-black colour. This confirms the presence of starch in the sample.

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Deficiency diseases are the diseases which occur mainly due to the lack of one or more nutrients in the diet over a long period of time.

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1 Mark each
The following steps are performed to test the presence of starch in a food item.
1. A small quantity of the food item to be tested is taken.
2. The food sample is then diluted with two drops of water.
3. 2-3 drops of iodine solution are added to it.
4. Once the iodine solution is added, the colour change in the food sample is observed.
5. Change of colour in the food sample into blue-black indicates the presence of starch in it.

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Vitamin Apromotes good visionand maintains healthy eyesand skin.

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Disease + symptoms: 1 Mark each
$\begin{array}{ccc}\text{Vitamin/Mineral}& \text{Disease}& \text{Symptom}\\ \text{Vitamin A}& \text{Night blindness}& \text{Loss of visionin darkness}\\ \text{Vitamin C}& \text{Scurvy}& \text{Bleeding gums}\\ \text{Vitamin D}& \text{Rickets}& \text{Soft and bent bones}\\ \text{Iodine}& \text{Goiter}& \text{Swollen neck glands}\\ \text{Iron}& \text{Anaemia}& \text{Extreme weakness}\end{array}$

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1 Mark each
1. Asmall quantity of the food item to be tested is taken. If the food is solid, it should be either made into apaste or powdered.
2. Some of the food material is taken in a clean test tube and 10 drops of water are added to it. These are then mixed properly by shaking the test tube.
3. Using a dropper, two drops of copper sulphate solution is added to the test tube followed by ten drops of caustic soda solution.
4. The contents are mixed well and the test tube is allowed to stand for a few minutes.
5. If the solution turns violet, it indicates thepresence of proteinin the food item.

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Sources: 1 Mark
Functions: 1 Mark
Depending on its origin, there are two types of proteins - animal proteins and plant proteins. Animal proteins come from food like eggs, fish, meat and milk. Plant proteins comefrom pulses, beans, soya bean, etc.
Proteins act as building blocks and are needed by the body for growth and repair.

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1 Mark each
The three main types of foods are energy giving foods, body-building foods, and protective foods.
1. Energy-giving foods: They are made of carbohydrates and fats. Carbohydrates provide us with instant energy, while fats are stored as energy resources.
2. Body-building foods:Proteins are considered to be body-building foods as they help in body growth and also help in repairing damaged parts of the body.
3. Protective foods: Protective foods are mainly vitamins and minerals since they protect us from many diseases. They give us resistance against disease-causing germs.

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Diseases: 1 Mark each
Any three:
1. Iron deficiency:Lack of iron in the diet leads to a deficiency disease called anaemia.
Symptoms of anaemia include headaches, dark patches under the eyesand general weakness.
2. Iodine deficiency:Lack of iodine in the diet leads to a deficiency disease called goitre.
In adults, goitre results in swelling of glands near the throat.In children, iodine deficiency causes stunted mental and physical development.
3. Calcium deficiency:Lack of calcium in the diet makes the bones weak and brittle. It can also cause tooth decay.
Symptoms of calcium deficiency are weak bones and teeth, stunted growth andexcessive bleeding from wounds.
4. Phosphorous deficiency:Lack of phosphorous in the diet makes the bones weak and brittle. It also causes improper functioning of the heart and muscles and causes errors in the formation of DNA.
Symptoms include fragile bones and teeth, and disorders in the muscular system.