LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.
SIXTH SEMESTER – APRIL 2008
PB 6605 - ENVIRONMENTAL BIOTECHNOLOGY
Date : 21/04/2008
Time : 9:00 - 12:00
Dept. No.
KL 24
Max. : 100 Marks
PART – A
Answer ALL the questions
(20 marks)
I. Choose the Best answer
(5 x 1 = 5 marks)
1. The percentage of methane in biogas is
a) 75
b) 25
c) 50
d) 35
2. Which of the following is an organophosphate?
a) Semesan
b) Panogen
c) Panodrench
d) Parathion
3. The bacterium involved in bioleaching is
a) Bacillus thuringiensis
b) Agrobaterium tumefaciens
c) Thiobacillus thioxidans
d) Trichoderma viride
4. The name superbug refers to
a) Pencillium b) Pseudomonas
c) Neurospora
d) Azotobacter
5. The depth of rock bed in a trickling filter is
a) 1-3 m
b) 5-6 m
c) 7-8 m
d) 10 m
II. State whether the following statements are TRUE or FALSE
(5 x 1 = 5 marks)
6. Halobacterium survives even in anaerobic conditions.
7. Hydrogenase enzyme is not involved in Hydrogen production.
8. Pentachlorphenol is a broadspectrum biocide.
9. Nematodes are involved in vermicomposting.
10. Ozone depletion is caused by over-exploitation of fossil fuels.
III. Complete the following
(5 x 1 = 5 marks)
11. Salvinia and Water Hyacinth are used in the production of _______________.
12. ____________ Sludge process is type of aerobic process.
13. Aspergillus flavus is associated with ____________ degradation.
14. Use of ___________ is reduced in fridges to prevent faster ozone depletion.
15. Bioremediation of coal wastes can be done by employing __________ fungi.
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IV. Answer the following each in about 50 words
(5 x 1 = 5 marks)
16. Define the term bioremediation.
17. What is Biosorption?
18. What Biocorrosion?
19. Define Xenobiotics.
20. Explain Silaging.
PART – B
Answer any FIVE of the following each in about 350 words.
Draw Diagrams & Flow charts wherever necessary.
(5 x 8 = 40 marks)
21. Describe briefly the non-conventional energy resources.
22. Describe vermicomposting process.
23. Discuss the characteristics of sewage and objectives of sewage treatment.
24. How soil is polluted by xenobiotics?
25. Give brief account of pathways of phenol degradation.
26. Describe the types of reactors used in bioremediation.
27. Discuss the role of radionuclides in pollution.
28. Explain ex-situ bioremediation.
PART – C
Answer the following questions each in about 1500 words.
Draw Diagrams & Flow charts wherever necessary
(2 x 20 = 40 marks)
29. a) Write an essay on biogas production.
(or)
b) Describe the following: i) In-situ bioremediation
iii) Sewage oxidation ponds.
ii) Biomineralisaion
30. a) List the methods involved in removal of pollutants from water bodies.
(or)
b) Discuss the various methods of purification of polluted air.
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