(a) Explain the term chemical weathering of rocks.  [2 marks]

(b) Discuss four processes of chemical weathering of rocks [10 marks]

(c) State four ways in which soil temperature is important for crop growth (4 marks)

(a) Give two reasons for each of the following practices undertaken by some West African farmers (i) movement of herdsmen and their flocks southwards to the rain forest zone during the dry season (4 marks) 

(ii) Preference for the use of simple farm tools over farm machinery (4 marks)

(b)(i) Identify four problems associated with the movement of herdsmen (4 marks)

(ii) Suggest a solution to each of the problems. [4 marks]

 (a) Outline six benefits derived from growing ornamental plants, [6 marks]
 (b) State four symptoms of cassava mosaic disease. [4 marks] 
(c) Explain the following terms as used in forest management. (i) selective exploitation (ii) regeneration (iii) taungya farming [6 marks] 

(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]