LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – BIOTECHNOLOGY
THIRD SEMESTER – NOV 2006
AE 19
BT 3813 - ENVIRONMENTAL BIOTECHNOLOGY
Date & Time : 27-10-2006/9.00-12.00
Dept. No.
Max. : 100 Marks
PART – A
Answer all the Questions
I. Choose the best answer:
(20 Marks)
( 5 x 1 = 5)
01.Rubredoxin system is a ----------enzyme.
(a) monooxygenase
(b) diooxygenase
(c) oxidase
(d)dehydrogenase
02.Transformation of one species of molecule into less toxic species by plants is called
(a) Phytodegradation
(b) phytovolatilization
(c) phytostabilization
(d) phytoextraction
03.Green house gases are
(a) CO2
(b)CH4
(c)N2O
(d)all of the above.
04. ---------- produces biodegradable plastic.
(a) Alcaligenes eutrophus
(b)Thiobacillus ferroxidans
(c) Alcaligenes faecalis
(d) Pseudomonas putida
05.To control eutrophication-------- should be removed from wastewater.
(a) carbon
(b) zinc
(c) phosphorous
(d) lead.
II. State true or false, if false state reason
( 5 x 1 = 5)
06. Biomagnification occurs when the compound is both persistent and lipophilic.
07. Polyethylene is a biodegradable plastic.
08. Xenobiotics cannot serve as substrate for microbial growth.
09. Metallothionein is a biochelator.
10. Acinteobacter sp. is responsible for the biological removal of phosphorous.
III Complete the following:
( 5 x 1 = 5)
11.Acid rain is caused by oxides of--------------- and-----------.
12.The bacterium----------is used for the recovery of copper from chalcopyrite.
13. -------------- is the process of addition of selected organisms to contaminated sites to
enhance degradation.
14. ----------- and----------- exhibit symbiotic relationship in aerobic zone.
15.The uptake of heavy metal can be from waste water can be---------- or --------mechanism.
IV. Answer the following in 50 words.
:
( 5 x 1 = 5)
16.Ozone hole.
17.Denitrification
18Mineralisation
19.Biosorption
20.Biopol
PART-B
Answer any FIVE questions within 350 words.
(5 x 8 = 40)
21.Write an account on pond treatment process.
22.Discuss the biodegradation of chlorinated hydrocarbons.
23. What is biocorrosion? Explain the mechanism of biocorrosion.
24. Write an account on different methods used for gaseous bioremediation.
25. Define co- metabolism. Explain the mechanism with an example.
26. Explain different methods of bioleaching process.
27. Describe the causes and consequences of water pollution.
28. Discuss the bioleaching of gold and uranium.
PART- C
Answer each of the follwing within 1500 words
(2 x 20 = 40)
29. (a). What is biodegradation? Explain biodegradation of hydrocarbons.
(Or)
(b). Explain sludge treatment and disposal in detail.
30. ( a ). Discuss the aerobic process employed in biological treatment of sewage water
(Or)
(b). Write an essay on mechanisms of microbial metal tolerance.
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