1. Summary

Different food items contain different types of nutrients. Nutrients are chemical components in food that are required for releasing energy and helps in growth. Carbohydrates, proteins, fats, vitamins and minerals are important nutrients found in food.

Carbohydrates and fats mainly provide energy. Proteins mainly help in growth. Starch and sugar are the two kinds of carbohydrates found in food.

To test the presence of starch in a food item, you need to:

  • Take small quantity of the food items to be tested.
  • Put 2-3 drops of iodine solution on it.
  • Observe the colour of the food item.
  • Blue-black colour indicates the presence of starch in the tested food item.

To test for the presence of proteins in a food items, you need to:

  • Take a small quantity of the food items to be tested.
  • Grind/mash/paste/powder the food item.
  • Put the food item into a test tube.
  • Add 10 drops of water to the test tube.
  • Add two drops of copper sulphate solution to the test tube.
  • Add 10 drops of caustic soda solution and shake the test tube.
  • Observe the colour of the mixture.
  • Violet colour indicates the presence of proteins in the tested food item.

To test for the presence of fats in a food item, you need to:

  • Take a small quantity of the food item to be tested.
  • Wrap the food item in a small piece of paper.
  • Crush the food item wrapped in the paper.
  • Straighten the paper.
  • Dry the paper by keeping it in sunlight for a while.
  • Observe the paper.
  • An oily patch on the paper indicates the presence of fats in the tested food item.

2. Videos
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3. Activities & Simulations
4. Teacher Solved Exercises
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