(a) State the law of diminishing returns in agricultural production. (2 marks) (b) The table below shows the relationship between quantities of fertilizers ...

(a) State the law of diminishing returns in agricultural production. (2 marks)

(b) The table below shows the relationship between quantities of fertilizers used and the corresponding yields of sorghum.

(i) Use the table to draw an input-output graph (3 marks) 
(ii) Explain the relationships between fertilizer input and sorghum yield. (2 marks)

 (c) Enumerate four functions of an agricultural extension agent. (4 marks)

(d) State five benefits of commodity boards in the marketing of agricultural produce in West Africa. (5 marks)