SOIL, AGRICULTURE MICROBIOLOGY AND BIODEGRADATION

DEPARTMENT OF MICROBIOLOGY

SOIL, AGRICULTURE  MICROBIOLOGY AND BIODEGRADATION

TIME: 2 HOURS                                  MAXIMUM: 50 MARKS

SECTION - A                                                  

ANSWER ALL THE QUESTIONS                           (5X4=20)

1. a) Give an account on any three non-symbiotic N₂ fixers. (or)

    b) Add a note on nif genes

2. a) Describe the phosphorus cycle                (or)

    b) Give an account on sulfur cycle.

3. a) Discuss the Rhizobium.                            (or)

    b) Give a note on root nodulation.

4. a) Write short notes on cyanobacteria                      (or)

   b) Comment the biopesticides with suitable example

ANSWER ALL THE QUESTIONS                           (10×3=30)

5. a) Explain in the detail about nitrogen cycle.           (or)

   b) Write an essay on VAM

6. a) Give an detailed account on Biodegradation. (or)

   b) Explain about the microbial transformation of sulfur.

7. a) Describe about the Nitrogen fixation process. (or)

    b) Explain about the Trichoderma viridae.