Question

Describe the principle on which the following methods of food preservation are based :
a) boiling , b) canning , c) freezing , d) dehydration


For class 8 ..........​

Answer 1

A . Boiling

reheat the sauce to just below boiling"

B . Canning

Canning is a method of preserving food in which the food contents are processed and sealed in an airtight container. Canning provides a shelf life typically ranging from one to five years, although under specific circumstances it can be much longer.

C . Freezing

strong winds and freezing temperatures

D . Dehydration

Dehydration can have causes that aren't due to underlying disease. Examples include heat, excessive activity, insufficient fluid consumption, excessive sweating or medication side effects.