Explain the following methods of food preservation:


(a) Dehydration

Answer: It is the process in which water content of the food stuff is removed. Many vegetables like onions and cauliflower are dried to preserve them.

(b) Canning and Bottling

Answer: It is the process of preserving food like fruit jams and pickles by packing them into glass jars or tin cans and then heating the jars to kill the microorganisms that would create spoilage.

(c) Pasteurisation

Answer: The process of heating food followed by immediate cooling, to limit the growth of microorganisms. The temperature used during pasteurization is 100 degrees Celsius.