. (a) Give eight characteristics of agricultural systems in West Africa. (b) Explain four ways in which land tenure systems affect agricultural production in your country.

(a) Explain the following terms: (i) primary tillage implement; (ii) secondary tillage implement.

(b) (i) State three reasons why disc ploughs are better suited for soils in West Africa than the mouldboard ploughs. (ii) List six major parts of a disc plough.

(c) Give three reasons why secondary tillage is necessary before sowing of seeds. (d) State three precautions a farmer should take when spraying chemicals

(a) State three ways by which nitrogen is added to soil in the Nitrogen cycle.

(b) List five ways by which nitrogen is lost from the soil.

(c) State the importance of the Nitrogen cycle.

(d) Explain three processes leading to the formation of nitrate from organic matter in the Nitrogen cycle.

 (a) Enumerate four economic importance of rocks: (i) to man; (ii) in agriculture. (b) State two characteristics of each of the following (1) igneous rock (ii) metamorphic rock. (c) Describe the mode of formation of sedimentary rocks.

(a) Explain the following terms as used in crop production: (i) floriculture; (ii) taungya farming; (iii) ley farming. (b) State eight uses of ornamental plants to man. (c) Mention four fibre crops grown in your country.