LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.
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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)
- Suspended matter and dissolved solids present in the polluted water
- impart turbidity to natural waters
- restrict penetration of light to lower layer
- reduce plant life growing in sub surface layers of water
- all the above
- Biostimulation treatment process is applicable to ___ remediation
- soils b. soil, ground water and sediments
- ground water and soil d. ground water
- Camphor degrading genes of Pseudomonas pudita are located on____
- chromosome b. super numerary chromosome
- plasmid d. transposons
- 04. Thiobacillus ferroxidans grows best at pH
- 1.5 – 2.5 b. 2.0 – 3.0 c. 1.0 – 1.5 d. 3.0 – 5.0
- Heavy metals may be remediated in metal contaminated soil by
- volatilization b. precipitation
- binding to organic matter d. all the above
II State whether the following statements are True or False (5 x 1 = 5 marks)
- The petrochemical ethanol is manufactured both by fermentation and chemical
means.
- Rotating biological contactors requires moderate energy input.
- The mature biofilm is formed by a combination of colonization and bacterial growth.
- The benthic zone is situated at the bottom of the lentic aquatic body.
- Alkaline waters are usually unprotective.
III. Complete the following ( 5 x 1 = 5 marks)
- _________ is a mixture of ethanol(20%) and petrol(80%).
- _________ are used to increase the aqueous solubility of petroleum hydrocarbons.
- Permanent hardness of water is due to ___________.
14._________ leaching is essentially carried out in old, shut down underground mines.
- __________is the deposition of minerals by living organisms.
- Answer all, each in about 50 words ( 5 x 1 = 5 marks)
- What is pollution blanket?
- What are stillages ? Mention the uses of stillages.
- Write notes on flocculant settling.
- What is bioaugmentation?
- 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.
- Summarise the characteristic features of a lotic system.
- Meteorological conditions play an important role in the dilution and dissemination of wastes in the atmosphere _ Discuss.
- Give an account of bioremediation of petroleum hydrocarbons.
- Briefly write about biofiltration technique with reference to purification of polluted air.
- Give an account of composting.
- Write notes on oxidation ponds.
- Briefly describe the steps involved in the development of biofilm.
- 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
- Explain solubilisation, acidogenesis and methanogenesis.
OR
- 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
- Describe the following
- Biomineralisation
- Types of reactors used in bioremediation