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Soil 213: Soil Genesis And Classification Question Paper

Soil 213: Soil Genesis And Classification

Course:Bachelor Of Science In Agriculture

Institution: Egerton University question papers

Exam Year:2013

ANSWER ALL QUESTIONS

1.(a) Explain the term isomophous substitution in soil clay minerals. (2 Marks)
(b) Distinguish between the clay structures of 1:1, 2:1 and 2:1:1 and give an
example of each mineral type. (6 Marks)
(c) Briefly describe the digenesis processes that convert sediments into sedimentary
rocks. (6 Marks)
(d) Distinguish between humic and fluvic acids. (2 Marks)
(e) Differentiate between physical and chemical weathering processes. (4 Marks)
2.(a) describe topography as a soil forming factor. (10 Marks)
(b) What do you understand by the following terms: (2 Marks)
* Illuvial
* Eluviations
3.(a) Explain soil features resulting from the following processes (4 Marks)
* Biological activity
* Shrinkage and swelling
(b) Describe the process of oxido-reduction and the features of the resulting soils. (6 Marks)
(c) What do you understand by the term topo-sequence as used in soil formation? (2 Marks)
4.(a) Differentiate between soil profile and soil horizon. (4 Marks)
(b) Distinguish between humus and non humus components of the organic fraction of the
soil. (8 Marks)
5.(a) What is the importance of soil classification? (2 Marks)
(b) Distinguish between O and H soil master horizons. (4 Marks)
(c) List the activities undertaken while carrying out soil survey fieldwork. (8 Marks)

Soil 213: Soil Genesis And Classification Question Paper

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