S.4 Agriculture Holiday Revision Work 2020 Caltec S.4

PRINCIPLES AND PRACTICES OF AGRICULTURE 2020 UCE UNEB REVISION QUESTIONS 1. (a) Which one of the following is a trace element required for crop growth? Phosphorus Potassium Iron Nitrogen (b) The advantage of using metal over wood in construction is that metal is Durable Cheap Readily available A good insulator of heat (c) Which one of the following would affect the demand of a commodity in the market? Cost of transport Cost of labour Technology used in production Size of income (d) one of the characteristics of sandy soil is that it Is hard to till when dry Feels gritty on touching Has a high capillarity Contains plenty of nutrients 2. Explain four factors that influence the rate of soil erosion(04 marks) Over cultivation, loosens soil thus increasing the rate of soil erosion Mono cropping ,where crops may not give a good soil cover leads to increased rate of soil erosion Deforestation leaves the land bare leading to increased soil erosion Soil type ,loose /sandy soils are likely to be washed easily Intensity of rainfall ;the higher the intensity of rainfall the higher the rate of erosion Ploughing down slope; creates channels which increase the rate of soil erosion Bush burning; leaves the soil bare increasing the rate of soil erosion Vegetation cover/clean weeding; thick vegetation cover reduces the rate of soil erosion NB: No need of explanation Award 1 mk @ x 4 points 3. (a) What is meant by inelastic demand? (01 mark) Is a situation where a large change in price causes a small change in quantity demanded (OWTTE) (b) Give three situations when demand of an agricultural commodity may be inelastic (03 marks) When the degree of necessity is high When there is no close substitutes When the income of consumer is higher Addictive habits 4. …