DISTANCE EDUCATION
M.Sc. (Zoology) DEGREE EXAMINATION, MAY 2017.
ENVIRONMENTAL BIOLOGY
Time Three hours Maximum 100 marks
SECTION A — × 8 40 marks)
Answer any FIVE of the following questions in about
300 words each.
1. Give an account on Nitrogen cycle.
2. Briefly explain the characteristics of a community.
3. Describe the role of microbes in bioremediation.
4. What are the factors affecting the population growth?
5. Describe the physico-chemical aspects of estuaries.
6. Comment on species diversity indices and its
applications.
7. Explain the types of isolation mechanisms.
8. Discuss the influence of competition on community
structure.
SECTION B — × 15 60 marks)
Answer any FOUR of the following questions in about
500 words each.
9. Write an account on different types of ecological
pyramids.
10. Give an account on recycling pathway of elements.
Sub. Code
21
DE-756
2
Ws 5
11. Explain global climate change. Discuss the international
efforts to mitigate climate change.
12. Describe the role of microbes in bioremediation.
13. Explain the population interactions. Comment on its
ecological and evolutionary significances.
14. Discuss the unique features of Mangrove.
15. Give an account of adaptive ability of animals with
environmental changes.