M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Microbiology
Paper IV AGRICULTURAL MICROBIOLOGY
2 20634-AA
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Algae
2. Hydrocarbons in soil
3. Phyllosphere
4. Azotobacter
5. Biocontrol of pests
6. Virulence
7. Blight of Rice
8. Citrus canker
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Describe the methods of isolation and enumeration of soil microflora.
Or
Write an account on Humous significance and degradation.
10. Describe the mechanism of Symbiotic Nitrogen Fixation.
Or
Write an account on Vesicular Arbuscular Mycchorizae.

11. Describe the symptoms of plant diseases.
Or
Describe the development of genetically modified crop plants for control of
pests.
12. Describe the symtomatology, etiology, epidemiology and control of Rust of Groundnut.
Or
Write an account on two viral diseases of crop plants.
———————