M.Sc. DEGREE EXAMINATION, APRIL 2017
Second Semester
Microbiology
Elective III — AGRICULTURE AND ENVIRONMENTAL
MICROBIOLOGY
(2016 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. What is parasitism?
2. Function of VAM.
3. What is Biocide?
4. Define Damping off.
5. What is aerosols?
6. Role of nitrifying bacteria.
7. List out Acidophilic microbes.
8. Define detritus food chain.
9. Importance of sacchrification process.
10. Define methanogenesis.
Sub. Code
530503/
530504
RW-212
2
wk12
Part B x 5 25)
Answer all questions, choosing either or
11. Explain the microbial interaction between
mycorrhizae and symbiotic association in root
nodules.
Or
What is biofertilizers? Discuss in brief its
application.
12. Give a brief account on the casual organisms and
symptoms of infected cotton crop.
Or
Enumerate the biological control measures of
bacterial infected crops.
13. Write short notes on phosphorous cycle.
Or
Discuss the problem associated with aerosol
accumulation in the atmosphere.
14. Define barotolerants. What kind of physiological
adaptation allow it to grow optimally under
pressure.
Or
Write short notes on coral reefs and their microbial
communities.
15. Explain the role of methanogenesis bacteria in
biogas production.
Or
Write short notes on oxidation pond.
RW-212
3
wk12
Part C 10 30)
Answer any three of the following.
16. What are antagonist? Explain in brief about different
microbial interaction process.
17. Give an account on the pathogen, symptoms and control
measures of bacterial infected maize and tomato crops.
18. Discuss in detail that soil a habital for microorganism.
19. How are the microorganism classified based on pressure,
light and pH? Describe in detail.
20. Write an essay on the production of Gobar gas from solid
waste with suitable diagram.
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