Environmental Microbiology — DU B. Sc. (Hons) Microbiology Previous Year Question Papers

(d) Give an example of each of the following : (i) Cellulose degrader (ii) Halophilic bacteria 6. Briefly explain the following : (a) Nitrate pollution (b) Presence/absence test of coliforms (c) Degradation of Chitin (e) Bioluminescent bacteria Instructions .for Candidatets 1. (a) Discuss the role of microbes degrading plastic giving suitable examples. (5) (b) Write a note on sulphur cycle. (5) (c) Discuss synergism with the help of suitable exalpples? 2. Write short notes on any three of the following : (i) Activated sludge process (ii) Microbial degradation of lignin (iv) Nematophagus fungi 3. Differentiate between any five of the following : (ii) 01igotrophic and eutrophic lake. (iii) Oxidation ponds and Septic tank. (iv) Nitrification and denitrification. (v) Commensalism and amensalism. (vi) Neuston and pleuston (3x5-15) 4. (a) What is sewage strength? How is it determined? (b) Write in brief about degradation of pesticide (c) Comment on termite gut micro flora. (5) 5. (a)Write a note on spor? dispersal in (b) Describe in brief the mycorrhizal associations. (c)Write a note on microbial succession in decomposition of plant organic matter. (4)