LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

IB 24

SIXTH SEMESTER – APRIL 2007

PB 6605/PB 6602 – ENVIRONMENTAL BIOTECHNOLOGY

 

 

 

Date & Time: 18/04/2007 / 9:00 – 12:00     Dept. No.                                                   Max. : 100 Marks

 

 

Part A                                           (20 marks)

Answer All questions

I Choose the Correct Answer                                                                     ( 5 x 1 = 5 marks)

1. Suspended matter and dissolved solids present in the polluted water
2. impart turbidity to natural waters
3. restrict penetration of light to lower layer
4. reduce plant life growing in sub surface layers of water
5. all the above
6. Biostimulation treatment process is applicable to ___ remediation
7. soils b. soil, ground water and sediments
8. ground water and soil d. ground water
9. Camphor degrading genes of Pseudomonas pudita are located on____
10. chromosome b. super numerary chromosome
11. plasmid d. transposons
12. 04. Thiobacillus ferroxidans grows best at pH
13. 1.5 – 2.5    b. 2.0 – 3.0               c. 1.0 – 1.5      d. 3.0 – 5.0
14. Heavy metals may be remediated in metal contaminated soil by
15. volatilization b. precipitation
16. binding to organic matter d. all the above

           

II State whether the following statements are True or False                (5 x 1 = 5 marks)

6. The petrochemical ethanol is manufactured both by fermentation and chemical

means.

7. Rotating biological contactors requires moderate energy input.
8. The mature biofilm is formed by a combination of colonization and bacterial growth.
9. The benthic zone is situated at the bottom of the lentic aquatic body.
10. Alkaline waters are usually unprotective.

 

III. Complete the following                                                                     ( 5 x 1 = 5 marks)

11. _________ is a mixture of ethanol(20%) and petrol(80%).
12. _________ are used to increase the aqueous solubility of petroleum hydrocarbons.
13. Permanent hardness of water is due to ___________.

14._________ leaching is essentially carried out in old, shut down underground mines.

15. __________is the deposition of minerals by living organisms.

 

1. Answer all, each in about 50 words ( 5 x 1 = 5 marks)
2. What is pollution blanket?
3. What are stillages ? Mention the uses of stillages.
4. Write notes on flocculant settling.
5. What is bioaugmentation?
6. Distinguish between micro and macrofouling.

 

 

 

 

PART B                       ( 5 x 8 = 40 marks)

 

Answer any five, each within 350 words only. Draw diagrams and flowcharts wherever necessary.

21. Summarise the characteristic features of a lotic system.
22. Meteorological conditions play an important role in the dilution and dissemination of wastes in the atmosphere _ Discuss.
23. Give an account of bioremediation of petroleum hydrocarbons.
24. Briefly write about biofiltration technique with reference to purification of polluted air.
25. Give an account of composting.
26. Write notes on oxidation ponds.
27. Briefly describe the steps involved in the development of biofilm.
28. Describe the bioleaching of copper and uranium.

 

PART C                       ( 2 x 20 = 40 marks)

 

Answer the following, each within 1500 words only. Draw diagrams and flowcharts wherever necessary.

 

29 a.     i. Describe the structure of different types of biogas plants

1. Explain solubilisation, acidogenesis and methanogenesis.

 

OR

1. Write an essay on secondary treatment of waste water.

 

30 a.  What are xenobiotics ? Describe biodegradation pathways of pentachlorophenol

and poly chlorinated biphenyl.  Suggest strategies to promote biodegradation of

xenobiotics.

OR

1. Describe the following
2. Biomineralisation
3. Types of reactors used in bioremediation

 

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