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2 D 92962

Section B (Short Essay Type Questions)

Answer at least five questions.
Each question carries 6 marks.
All questions can be attended.
Overall Ceiling 30.
Briefly discuss the major organisms present in the air.
Elaborate the major harmful micro-organisms and air-borne infections.

Investigate the major factors influencing the growth and distribution of micro-organisms in aquatic

ecosystems.

Elucidate the major steps involved in the purification of municipal water.

Discuss the principles, methodology and applications of vermi-composting.
Illustrate the production of biogas.
Examine the mechanisms of the biodegradation of PCBs.
Discuss the major step involved in the microbial leaching with appropriate examples.
(5 x 6 = 30 marks)
Section C (Essay Type Questions)

Answer any two questions.
Each question carries 10 marks.

Investigate the methods and devices used for the microbiological quality of air.
Elaborate the major steps involved in the treatment of waste water.
Discuss the major types of waterborne diseases and their transmission.

Critically discuss the construction of superbugs for the bioremediation of oil spills.

(2 x 10 = 20 marks)