My Food, My Choice

Description

Did you know that humans started preserving food even before the discovery of fire? Humans would freeze food on ice in colder regions and dry foods in tropical regions. Today, other than freezing and drying, we use a lot of other techniques to preserve food. Can you list some of them?

Materials Required

A slice of tomato, a slice of cooked potato, a spoonful of tomato ketchup or chutney, a potato chip, a spoonful of wheat flour and a piece of bread or chapati, petri-dishes or watch glass