(a) State four reasons why the prices of most agricultural produce are unstable in West
Africa. [ 4 marks ]

(b) Explain the following agricultural extension methods:
(i) method demonstration;
(ii) agricultural shows. [ 4 marks ]

(c) Discuss the cercospora leaf spot disease under the following headings:
(i) crop affected;
(ii) causative agent;
(iii) mode of transmission;
(iv) two symptoms;
(v) one preventive measure. [ 6 marks ]

(d) State four advantages of selection as a method of crop improvement. [ 4 marks ]