DISTANCE EDUCATION
M.Sc. (Zoology) DEGREE EXAMINATION, DECEMBER 2017.
ENVIRONMENTAL BIOLOGY
Time Three hours Maximum 100 marks
SECTION A — × 8 40 marks)
Answer any FIVE questions.
All questions carry equal marks.
1. What are biotic and abiotic components? Describe briefly
the effect of abiotic factors on population.
2. Explain the concept of limiting factors in an ecosystem
and state the Shelford's law of tolerance.
3. Give a brief description on Carbon cycle on our
environment.
4. Explain the various factors that affect the growth of a
population.
5. Discuss briefly the importance of decomposers in an
ecosystem.
6. Explain the various major threats to mangrove
ecosystem.
7. make a note on source cause and effect of acid rain.
8. Enumerate the importance of environmental laws.
Sub. Code
21
DE-3058
2
Ws6
SECTION B — × 15 60 marks)
Answer any FOUR questions.
All questions carry equal marks.
9. Give a detailed account on ex-situ and in-situ approach
for conservation of ecosystem.
10. Describe in detail about the complete and incomplete
biogeochemical cycles on our planet.
11. Discuss in detail the mechanism of ecological succession.
12. Classify different types of natural resources. Explain the
various methods for their conservation.
13. Write an account on the causes and effects of air pollution
and suggest some remedies to control air pollution.
14. What is meant by global warming? Discuss its ill effects.
15. Give a detailed account on the role of microorganisms in
bioremediation.
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