Question

You have been applied with a sample of food.How will you perofrm tests for the presence of starch and proteins in it?

Concise Biology Class IX By H.S. Vishnoi CHAPTER 13-DIGESTIVE SYSTEM

Answer 1

Add dilute Iodine solution to the food item to test whether it contains starch.A blue-black colour indicates that the food item contains Strach.
Using a dropper add two drops of solution of copper sulphate and ten drops of solution of caustic soda to the food item .A violet colour indicates presence of proteins in the food item.