(a) List five aims of crop improvement (b) Define the term selection in crop improvement. (c) List three methods of selection. (d) Explain the following genetic terms: (i) homozygotes (ii) back cross (iii) dominance.

(a) Give four reasons for rearing goats in West Africa. (b) List three advantages and three disadvantages of the extensive system of rearing goats in West African. (c) State six general characteristics of West African cattle breeds.

(a) State seven characteristic features of a good layer. (b) Describe the preparations to be carried out for receiving day old chicks for rearing. (b) Explain how poor storage facilities affect agricultural marketing.

State three advantages and one disadvantages of each of the following marketing agents (i) retailers (ii) Wholesalers (iii) co-operative societies.  

(a) State seven objectives of agricultural extension. (b) List the three main types of extension teaching methods and explain any two of them