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Soil 100: Introduction To Soil Science Question Paper

Soil 100: Introduction To Soil Science

Course:Bachelor Of Science

Institution: Egerton University question papers

Exam Year:2013

SECTION A: ANSWER ALL QUESTIONS

1.(a)Distinguish between the following terms: (4 Marks)
i. Soil profile and soil horizon
ii. Parent material and rock
(b) Briefly discuss two soil forming factors. (10 Marks)
2.(a) Define the term soil degradation. (2 Marks)
(b) Briefly describe four ways in which a soil degrades. (12 Marks)
3.(a) List four soil physical properties. (4 Marks)
(b) List two sources of soil organic matter. (2 Marks)
(c) Briefly describe four roles played by SOM in agriculture. (8 Marks)
4.(a) Discuss the role played by bacteria in soil fertility. (10 Marks)
(b) Briefly describe two factors that can limit the activity of bacteria in soil.(4 Marks)
5.(a) Briefly discuss the benefits of soil classification to farmers. (4 Marks)
(b) List the parameters used in Universal Soil Loss Equation (USLE) (4 Marks)
(c) A farm on moderately sloping land with high clay content has a serious water
erosion problem. Explain why this may be so and describe two erosion control
practices that can be effective in controlling this erosion. (6 Marks)
6.(a) Define a mineral. (2 Marks)
(b) Describe the three rock classes according to their mode of origin and give an
example in each. (12 Marks)

SECTION B: ANSWER ONE QUESTION ONLY

7.(a) Briefly describe the importance of SOM in the availability of plant nutrients(6 Marks)
(b) What is Soil Cation Exchange Capacity and why is it important in plant
nutrition? (4 Marks)
(c) What should a farmer do to improve the CEC of his/her soil. (4 Marks)

8.(a) Define the term Cation Exchange Capacity (CEC). (2 Marks)
(b) Describe how CEC is measured in the laboratory. (6 Marks)
(c) Discuss the importance of cation exchange in the soil. (6 Marks)

Soil 100: Introduction To Soil Science Question Paper

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