LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & BIOTECHNOLOGY

IB 25

SIXTH SEMESTER – APRIL 2006

                                          PB 6605 – ENVIRONMENTAL BIOTECHNOLOGY

 

 

Date & Time : 21-04-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

Part A

Answer all the questions                                                                     (20 marks)

 

Choose the best answer                                                                      (5×1=5)

 

1. Bacteriorhodopsin is constituted by
2. a) 50% protein, 50% lipids b) 25% protein, 75% lipids
3. c) 75% protein, 225% lipids d) 90% protein, 10% lipids

 

2. The normal size of the floc in the activated sludge process ranges from
3. a) 0.2 to 1mm b) 50 to 200μm c) 10 to 50μm             d) 100μm

 

3. The aqueous solubility of hexachlorobiphenyl is
4. a) 1- 6mg/l b) 10- 20 mg/l c) 7.5 mg/l       d) 0.00095 mg/l

 

4. The normal depth of an anaerobic pond is
5. a) 0.5-1m b) 1 to 10m c) 1 to 25m      d) 1to 2 m

 

5. Enhancement of microorganism through addition of nutrients is called
6. a) biodegradation b) biostimulation c) bioaugmentation     d) biorestoration

 

 

II State whether the following statements are  true  or false.             (5×1=5)

 

6. Constant mixing of the contents of atmosphere occurs due to air current and the vertical temperature gradient.
7. Coagulants are the negatively charged chemicals which form insoluble precipitates with positively charged ones.
8. The number and location of chlorines in PCB help to determine the rate and extent of bioremediation.
9. Anaerobic condition promotes the growth of BTEX degrading bacteria.
10. Copper ore is typically obtained by open – cut mining.

 

III  Complete the following                                                                (5×1 =5)

 

11. —————- is regarded to be a very useful information for the management and disposal of waste water.
12. —————- process system is used for the biological removal of phosphorus.
13. —————-is a broad spectrum biocide.
14. Rhizofiltration using sunflower has been used in the remediation of ————–

from surface water.

15. The enzyme toluene monooxygenase of Pseudomonas mendocina can degrade—-.

 

 

1. Answer the following , each in about 50 words. (5×1 =5)

 

16. Define biocorrosion.
17. What is flocculant settling?
18. What are xenobiotics?
19. What is co- metabolism?
20. Write short notes on rad waste.

PART  B

 

Answer any five of the following questions, each in about 350 words.
Draw diagrams / flow charts wherever necessary                                           (5×8=40)

 

21. Discuss the role of meteorological conditions in dilution of atmospheric pollutants.
22. Write in brief about any two types of biogas plants used in biogas production.
23. Compare and contrast different types of stabilisation ponds.
24. Explain briefly about bioremediation of heavy metals.
25. Write notes on biodegradation of PCP and PCBs.
26. Give an account of any four types of phytoremediation techniques.
27. Elaborate on microbial and multicellular biomineralisation.
28. Give an account on management of high level rad waste through reprocessing and vitrification.

PART C

 

Answer  the following questions, each in about 1500 words. Draw diagrams / flowcharts wherever necessary.                                                     (2x 20= 40)

 

29 a).  Write an essay on biological ethanol production.

(OR)

 

1. b) Describe the following : I) biological nitrogen removal (BNR)  (7)
2. ii) biological phosphorus removal         (7)

iii) disinfection.                                       (6)

 

30 a)  What is bioremediation?  Describe the strategies and types of bioremediation.

 

(OR)

 

1. b) Give an account of organisms, types and methods employed in bioleaching.

How are the copper and uranium recovered from their ores?

 

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