(a) State four functions of each of the following macro-nutrients in plant nutrition: (i) nitrogen; (ii) phosphorus; (iii) potassium. [12 marks] (b) List four factors that affect the availability of nutrients to crops. [4 marks]

The plan below represents the survey of a school farm. 

Use it to answer Questions (a) and (b).

(a) Calculate the area of the land in hectares [4 marks] 70m

(b) If the school plans to cultivate plantain at a spacing of 4m x 4m on 80% of the land and pineapple at a spacing of 2m x 2.5m on 20% of the land, calculate the number of plantain and pineapple planting materials that would be required for the farm. [12 marks] 

(a) Outline the life cycle of the bean beetle [6 marks] (b)(i) Describe briefly four damages done by cotton stainer to cotton plants on the field. [6 marks] (ii) Name four alternate hosts of cotton stainer [4 marks] 

(a) Mention four factors that should be considered when siting a fish pond. [4 marks] (b) Explain six ways of maintaining a fish pond. [12 marks] Discuss each of rinderpest and Newcastle diseases under the following headings: (i) host organism; [2 marks] (ii) causal organism; [2 marks] (iii) mode of transmission; [4 marks] (iv) symptoms; [4 marks] (v) control [4 marks] 

a) Name and explain three factors of production in agriculture [12 marks] (b) Mention four functions of a farm manager [4 marks]