LOYOLA  COLLEGE (AUTONOMOUS), CHENNAI-600 034.

M.Sc. DEGREE  EXAMINATION  – ZOOLOGY

second SEMESTER  – APRIL 2003

ZO 2807 / Z  829   environmental toxicology

           

02.05.2003

1.00 – 4.00                                                                                          Max: 100 Marks

 

PART – A                                       (2 ´ 10 = 20 Marks)

Answer ALL questions

 

1. Comment on aromatic hydrocarbon.
2. Give the names of any four organic acids.
3. Comment on biodegradation and bioaccumulation.
4. Give the name of four herbicide.
5. What is Ozone hole? How is formed?
6. Differentiate domestic waste from Industrial waste.
7. What is biopsy and autopsy?
8. Comment on acute and chronic toxicity.
9. Comment on Toxicity and Toxicant.
10. What is sound? How is it produced?

 

PART – B                                        (4 ´ 10 = 40 Marks)

Answer any four of the following

 

11. Classify pesticides based on the mode of action and the chemical nature.
12. “Toxicology is a multidisciplinary subject” –
13. Discuss briefly the toxicological impact of domestic waste.
14. Analyse the impact of heavy metals in toxicology.
15. Give an account of microorganisms and toxin production.
16. Discuss the impact of light and sound on plants.

 

 

PART – C                                        (2´ 20 = 40 Marks)

Answer any TWO of the following

 

17. Write an essay on the various processes used in the elimination of microbes.
18. Write an essay on the pesticides and its impact on man.
19. Discuss in detail Alicyclic compounds and its degradation and add a note synthetic detergents.
20. Explain the goals of Toxicology and discuss the various factors related to the organism in toxicolog.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034

M.Sc. DEGREE EXAMINATION –  ZOOLOGY

SECOND SEMESTER-APRIL 2004

ZO 2807/ Z  829  ENVIRONMENTAL TOXICOLOGY

19.04.2004

1.00 –4.00                                                                                         Max. 100 Marks

 

 

PART – A                              (10 ´ 2= 20 Marks)

Answer ALL the questions in two or three sentences.

 

1. What is physical poison?
2. What is response relationship?
3. Comment on ‘sludge’.
4. Differentiate bioremediation and biodegradation.
5. What is fluecolation?
6. Differentiate Toxicant and Toxin.
7. Differentiate acute and chronic toxicity.
8. Define ‘Oil sleek’.
9. Differentiate LD₅₀ and LC₅₀.
10. What is ozone hole and how it is formed?

 

PART – B                                                 (4 ´ 10 = 40 Marks)

Answer any FOUR of the following.

11. Toxicology is a multidisciplinary subject –
12. Discuss light and its role in vision of Man.
13. Give an account of soil pollution with a note on prevention.
14. Give an account of sources and impact of carbonmonoxide on man.
15. Give an account of synthetic polymers and their impact on animals.
16. Give an account of airpollutants and its toxicolgical impact on plants and animals.

 

    PART – C                                                 (2 ´ 20 = 40 Marks)

Answer any TWO of the following.

 

17. Write an essay on the classification of pesticides and their impact on fauna and flora.
18. Analyse the impact of heavy metals toxicants on reproduction of animals and add a note on its control methods.
19. Discuss indetail the role of domestic waste as toxicants and treatment of waste water.
20. a) Discuss indetail the role temperature in toxicity.
21. b) impact of industrial waste.

 

 

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             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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