(a)(i) Define agriculture [2 marks] (ii) List six branches of agriculture [3 marks]

(b) State five differences between commercial agriculture and subsistence agriculture [5 marks]

(c) State three merits and three demerits of using animal power on the farm. [6 marks]

 (a)(i) Explain the term farm surveying. [2 marks] (ii) State four reasons why farm surveying is important [4 marks]

(b) Enumerate six problems facing agricultural development in West Africa.

(c) List four factors that may affect the efficiency of draught animals. [4 marks] 

(a) Define the term soil. [2 marks]

(b)(i) List the four components of soil. [2 marks] (ii) State the percentage of each component by volume. [2 marks]

(c) Describe the process involved in making compost using the pit method under the following headings: (i) materials; [2 marks](i ) preparation; [6 marks] (iii) storage [2 marks] 

(a) Define soil erosion. [2 marks]

(b) List four factors that influence nutrient availability in the soil. [4 marks]

(c) Explain two roles of each of the following factors in soil formation: (i) climate; (ii) living organisms; (iii) topography. [6 marks]

(d) State four problems associated with overhead irrigation [4 marks] 

 (a)(i) Define crop rotation. [2 marks] (ii) Design a four-year crop rotation system using yam, cassava, maize and groundnut. [8 marks]

(b) State four reasons why weeds are difficult to control. [4 marks]

(c) Mention 'two effects of diseases on crop production [2 marks]