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Soil 212: Soil Biology Question Paper

Soil 212: Soil Biology 

Course:Bachelor Of Science In Agriculture

Institution: Egerton University question papers

Exam Year:2013



ANSWER ALL QUESTIONS

1. Using appropriate examples categorize soil organisms on basis of:
a. Size (9 Marks)
b. Carbon and energy requirements (12 Marks)
2. Briefly describe four microbial processes that occur in oxygen deficient habitat. (8 Marks)
3.(a) Describe the structure of the lignin polymer. (2 Marks)
(b) Why is lignin difficult to degrade. (2 Marks)
(c) Which organisms degrade lignin? (3 Marks)
4.(a) Define the term inoculation. (2 Marks)
(b) Describe the conditions in which inoculation is recommended. (4 Marks)
(c) Describe two methods used to measure BNF by legumes. (8 Marks)
5. Define the following terms: (8 Marks)
a. Bioremediation
b. Recalcitrant molecules
c. Co metabolism
d. Persistence
6. Briefly discuss four factors that influence the degradation rates of pesticides. (12 Marks)




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