LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

SIXTH SEMESTER – APRIL 2011

PB 6610/PB 6605 – ENVIRONMENTAL BIOTECHNOLOGY

 

 

 

Date : 07-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART-A (20 Marks)

Answer ALL  questions

 

1. Choose the correct answer (5X1=5 marks)

 

1. Biogas (Methane) production involves _______ microorganisms.
2. Acetogenic b. Methanogenic c. Hydrolytic & fermentative  d. All the above

 

2. _______ is otherwise known as superbug.
3. Pseudomonas putida b. Pseudomonas aeruginosa c. Proteus putida  d. Proteus aeruginosa

 

3. _____ cells are used to remove PCP from contaminated water.
4. Flavobacterium b. Arthrobacter c. Bacillus sp   d. Pseudomonas putida

 

4. _______is the in situ treatment that involves supplying air and nutrients through

wells to contaminated soil to stimulate the indigenous bacteria

1. Bioventing  b. Biosparging   c. Landfarming   d. Bioleaching

 

5._____ is an aggregate of microorganisms in which cells adhere to a surface.

1. Floc b. Biofilm   c.  Biocontaminants  d. None

 

1. State whether the following statements are TRUE or FALSE (5X1=5 marks)
2. The sewage of high organic material has high BOD
3. Activated sludge process is an anaerobic process.
4. Co-metabolism is used as an approach tobiological degradation of hazardous solvents.
5. Biopiles are a hybrid of landfarming and composting
6. Thiobacillus predominate  in the deposits of sulphide ores

 

III. Complete the following (5X1=5 marks)

11. _____ is the operation of composting process involving earthworms.
12. _____ is the predominant microorganism present in the trickling filters.
13. ______ is an emerging technology that uses plants to remove contaminants from soil and water
14. _____ is the process of addition of microorganisms indigenous or exogenous to the contaminated sites.
15. ________ is the process by which living organisms convert ions in solution into solid minerals.

 

1. Answer the Following ,each within 50 words (5X1=5 marks)
2. Define Eutrophication.
3. Define biosorption.
4. Define xenobiotics
5. Define bioremediation
6. Define Radionuclide

 

PART-B (5X7=35 marks)

Answer the following  within 500 words.

Draw  diagrams wherever necessary

 

21.a. Describe the process of composting.

Or

1. Write the causes and effects of soil pollution.

 

22.a. Describe briefly about the bioreactors used in effluent treatment.

Or

1. Give an account on the removal of oil spills using microbes.

 

23.a.  Describe the phenol biodegradation  pathway.

Or

1. Comment on the methods to purify polluted air.

 

24. Describe the types of reactors used in bioremediation.

Or

1. Write a note on the microbial populations involved in bioremediation process.

 

25. What are the treatment technologies for radionuclides?

Or

1. Discuss biofilms and biocorrosion.

 

 

 

 

 

PART-C (3X15=45 marks)

Answer any THREE of the following, each with 1200 words

Draw  diagrams wherever necessary

 

26. What are Non conventional energy resources and their types? Describe in detail about energy derived from wastes.
27. Outline the processes involved in the secondary sewage treatment.
28. Explain in detail about the degradation of PCPs and PCBs.
29. Explain in detail about the bioremediation strategies.
30. Give a detailed account on microbial leaching of any two metals.

 

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