(a) A farmer wants to choose an area, A or B, to plant vegetables. He takes a sample of the top soil from each area to a soil-testing laboratory. The results of the soil composition tests are shown in Figure 2. (ii) (i) Humus Water Clay Silt Fine sand Coarse sand Gravel 1000 B Figure 2. Results of soil composition tests Water Clay Fine sand Coarse sand Gravel Based on the results presented in Figure 2, suggest which area would be more suitable for the farmer to plant vegetables. Give ONE reason to support your answer. (2 marks) Using the following list of apparatus and materials, outline the procedure for obtaining the results presented in Figure 2. Two large measuring cylinders; stirring rod; soil samples in petri dishes; a beaker of water; balance (2 marks) (c) (iv) The soil samples are brought to the laboratory in a black bag. When the samples are poured out onto a tray, some small insects crawl quickly back into the soil. Write a hypothesis for this observation. Figure 4 shows a food web of soil organisms in a terrestrial ecosystem. Sun Organic matter Arthropods (2 marks) Birds Arthropods Nematodes Fungi Animals Figure 4. Food web in a terrestrial ecosystem Suggest how the population of fungi and the arthropods would be affected if all the nematodes were killed by a pesticide. Give a reason for your answer. Fungi Arthropods (2 marks) Total 20 marks

A scientist investigating into the quality of soil in Potsin area determined the soil bulk density using graphical approach. Five soil samples from the farm were sampled and their respective masses and volumes determined in the laboratory. The masses (g) of soils sampled and their respective volumes (V) are shown in the table below. A. Give two reasons why bulk density measurement is vital during soil quality investigations. B. Describe how the soil were sampled for the bulk density measurement. C. Identify four meteorological instruments and their uses.

61. Soil profile is a horizontal section exposing a set of horizons in a wall of a soil pedon. O True O False is an

true or false 2.) When the crop is badly lodged, mechanical harvesters are virtually useless and harvesting has to be done manually 3.) For measuring moisture content during harvesting, the most practical option is to use a resistance-type moisture meter that gives quick results and only uses small samples. 4.) Grain in the field dries naturally as the crop matures, giving up moisture to the air until the grain moisture is in equilibrium with the moisture in the air 5.) Most pests that cause deterioration in stored grains require a maximum amount of moisture to grow and reproduce.