(a) State two advantages and two disadvantages of using biogas as a source of farm power. [ 4 marks ]

(b) Mention eight simple farm tools. [ 4 marks ]

(c) List two common storage structures and two processing structures that could be found on a farmstead in West Africa. [ 4 marks ]

(d) Explain the term denitrification. [ 2 marks ]

(e) Describe the following components of the soil:
(i) mineral matter;
(ii) organic matter. [ 4 marks ]