Class 6 Biology Component of Food Protein


  • Our body use to build and repair tissues for which body needs proteins.
  • Nails, hairs, skin, muscles and blood all are made up of proteins.
  • Egg, meat, fish, oats, dal, almond, milk, yogurt are some rich source of protein.
  • Test of Protein: To test protein in food we need solution of copper sulphate and caustic soda.
  • Grind the food sample finely (for example: almonds). Put it in clean test tube and add 10 drops of water.
  • Using a dropper add 2 drops of copper sulphate solution. Shake it well.
  • Then add 10 drops of caustic soda solution. Shake it well.
  • Violet color indicates the presence of proteins.


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