LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – ZOOLOGY

TS 26

SECOND SEMESTER – APRIL 2006

                                              ZO 2901 – ENVIRONMENTAL TOXICOLOGY

(Also equivalent to ZO 2807)

 

 

Date & Time : 24-04-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

Part A                                     (Answer All)                          10 X 2 = 20

 

1. What is insolation?
2. Comment on acid rain.
3. What is meant by LC₅₀?
4. Explain the term xenobiotics.
5. What is biological magnification?
6. With one suitable example explain the term biofertilizer.
7. Comment on Minamata disease.
8. Enumerate the importance of metalothionines.
9. Explain the causal factors for global warming.
10. Define Shelford’s law of tolerance.

Part B                                     (Answer any four)                 4 X 10 = 40

11. Trace the source and impacts of oxides of carbon.
12. Briefly explain the impacts of light on biota.
13. Explain the source and impacts of heavy metal pollution.
14. ‘Sound is a physical toxin’ – substantiate.
15. Write notes on bioaccumulation, biodegradation and bioremediation.
16. Toxicology is a multidisciplinary field – Justify.

Part C                                     (Answer any two)                              2 X 20 = 40

17. Design an experiment to assess the toxicity of the xenobiotics
18. Discuss the toxic impacts of synthetic pesticides (or) detergents on man.
19. Write an essay on effect of toxicants on ozone layer.
20. Unregulated domestic wastes and industrial effluents directly affect the physical and biological environment – Justify.

 

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