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)
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