(a) (i) Define the term population. (ii) List two biotic and abiotic factors each that affect population growth. (b) What are the effects of food shortage o...

(a) (i) Define the term population. (ii) List two biotic and abiotic factors each that affect population growth.

(b) What are the effects of food shortage on a population?

(c) Describe two methods each for:
(i) improving crop yield (ii) preserving and storing food. Explain the principle involved in each of the methods described.