State the principles involved in the following methods of food preservation: (a) (i) Salting (ii) Refrigeration (iii) Drying (iv) Smoking (v) Chemicals. (b)...

State the principles involved in the following methods of food preservation:
(a) (i) Salting (ii) Refrigeration (iii) Drying (iv) Smoking (v) Chemicals.

(b) State four problems that may be caused by human overpopulation.

(c) Explain three ways by which the Government may increase food production.