Question

Discuss five methods of food preservation.

Answer 1

The following are the five methods of food preservation:
1) Heating: When food is heated at high temperature, all the microorganisms present in it are destroyed.
2) Pasteurisation: In this method, milk is heated at a high temperature for 30 seconds and then quickly cooled. This process kills the microorganisms present in milk.
3) Cooling: It prevents the growth and reproduction of microorganisms because microorganisms are not able to reproduce at low temperatures.
4) Drying: This process removes water from food. Since, microorganisms need water for their growth, drying food prevents the growth of microorganisms.
5) Canning: In this method, food is sterilised and then canned in airtight containers. This prevents the growth of microorganisms.