(a)(i) What is an agricultural system [2 marks] (ii) List five agricultural systems practised in West Africa. [5 mar] 

(b) State four ways in which non-governmental organisations contribute to agricultural production. [4 mar

(c) Give one function of each of the following components of an incubator: (i) counter (ii) thermostat; (iii) hygrometer (iv) egg tray; (v) heater. [5 marks each]

(a) Enumerate six factors that limit food production in West Africa. [6 marks]

(b) State three advantages and  three disadvantages of solar energy as a source of farm power. [6 marks]

(c) List four tractor-coupled implements [4 marks] 

(a) State four characteristics of clay. [4 marks]

(b) Mention four effects of drought on plant growth and development [4 marks]

(c) List two symptoms of phosphorus deficiency in crops. [2 marks]

(d) State three ways in which each of the following soil properties is important in crop production:(i) soil reaction; (ii) soil temperature. [6 marks] 

(a) List four soil conservation practices that can be used to control erosion on a gentle slope. [4 marks]

(b) Explain how each of the practices you have listed in 4(a) can be used to conserve the soil. [12 marks]

 (a) State four aims of crop improvement. [4 marks]

(b) Give four conditions necessary for seed germination. [4 marks]

(c) State the importance of conducting a germination test. [2 marks]

(d) Discuss briefly three problems associated with the use of poor quality planting materials. [6 marks]