DISTANCE EDUCATION
M.Sc. (Zoology) DEGREE EXAMINATION, MAY 2018.
ENVIRONMENTAL BIOLOGY
Time Three hours Maximum 100 marks
SECTION A — x 8 40 marks)
Answer any FIVE questions.
All questions carry equal marks.
1. What is food chain? Enumerate the major types of food
chain with suitable example.
2. What are ecological pyramids? Classify and discuss in
brief.
3. What are biogeochemical cycles? Explain sulphur cycle
with neat diagram.
4. What is meant by climax in ecological succession? Discuss
briefly the monoclimax theory.
5. Write a short note on population density and patterns of
distribution.
6. Give a brief account on coral bleaching.
7. What do you understand by the term 'climatic changes'?
List out the reason for climatic changes.
8. Explain the impact of noise pollution on human health.
Sub. Code
21
DE-4170
2
wk14
SECTION B — x 15 60 marks)
Answer any FOUR questions.
All questions carry equal marks.
9. Discuss the models of energy flow in an ecosystem.
10. Describe the events of phosphorus cycle.
11. Discuss in detail the process of ecological succession.
12. Define population. Give a brief account on various
characteristics of population ecology.
13. Explain the salient features of a marine ecosystem with
suitable illustration.
14. Define water pollution. Describe its sources, effects and
preventive measures.
15. Write an essay on role of NGO's in pollution control.