(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]