(a) State four ways in which weeds are beneficial to the farmer. [4 marks] 
(b) Classify insect-pests in three groups based on their mode of feeding and give two examples of each [9 marks] 
(c) State three ways by which pasture can be made available to cattle. [3 marks]

(a) Define each of the following terms as used in animal health: (1) pests (ii) pathogen (iii) vectors (iv) parasites [8 marks] 
(b) Give one example of an organism described by each of the terms in 7(a) above. [14 marks] 
(c) State four steps involved in silage making. [4 marks] 

 (a) Name four breeds of chicken used for commercial egg production. 14 marks] 
(b) State two functions of each of the following components in the diet of farm animals: (i) water (ii) minerals (ii) antibiotics (iv) protein [8 marks] 
(c) Enumerate four advantages of the intensive system of rearing ruminants. [4 marks]

 (a) State three functions of a farm manager. [3 marks] 
(b) Explain the following terms as used in agricultural economics: (i) appreciation (ii) salvage value (iii) farm budget (iv) farm inventory [8 marks]
 (c) State five qualities of a good agricultural extension agent. [5 marks] 

(a)(i) State the law of diminishing returns [2 marks} 
(ii) Explain the main cause of diminishing returns in agricultural production. [2 marks] 
(b) A commercial farmer bought a second hand combine harvester for N100,000.00 in 1990, and sold it for N30,000.00 in 2000. For the combine harvester (i) salvage value [1 marks] 
(ii) total depreciation [2 marks] 
(iii) annual depreciation [2 marks]
 (c) List seven problems of agricultural extension services in West Africa. [7 marks]