Acharya Nagarjuna University (ANU) 2005 M.Sc Microbiology IV - ENVIRONMENTAL AND AGRICULTURAL - Question Paper

M.Sc. (Previous) DEGREE EXAMINATION, DECEMBER 2005.
First Year
Microbiology
Paper IV - ENVIRONMENTAL AND AGRICULTURAL MICROBIOLOGY

Time : 3 hours Maximum : 100 marks

PART A - (5 x eight = 40 marks)
ans any 5 of the subsequent.
All ques. carry equal marks.

1. Aeroallergens.
2. Water - borne pathogens.
3. Soil microflora.
4. Iron in soil.
5. Plant growth promoting rhizo bacteria.
6. Azospirillum.
7. Etiology of blast of rice
8. Importance of seed treatment.

PART B - (4 x 15 = 60 marks)
ans all the 4 ques..
UNIT I

9. (a) discuss the significance of aero microbiology in relation to plant pathology.

or

(b) Write a detailed account on the anaerobic treatment of sewage.

UNIT II

10. (a) define the decomposition of soil organic matter.

or

(b) elaborate biogeochemical cycles ? discuss the role of microbes in nitrogen cycle.

UNIT III

11. (a) define the different kinds of mycorrhizal and write the importance of VAM fungi.

or

(b) What is biological nitrogen fixation ? Write the biochemistry involved in biological nitrogen fixation.

UNIT IV

12. (a) what are different procedures for the development of disease resistant varieties.

or

(b) Write various symptoms caused by plant pathogenic bacteria.

Earning:   Approval pending.