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FOURTH SEMESTER (CUCBCSS—UG) DEGREE EXAMINATION —
APRIL 2020 ١
Microbiology

MBG 4B 04—SOIL AND AGRICULTURAL MICROBIOLOGY
(2018 Admissions)

Time : Three Hours + 5 ்‌ Maximum : 80 Marks
Draw diagrams wherever necessary
Section A
Answer all questions.
Each question carries ¥% marks.

1. Name one bacteria oxidizing ammonium to nitrite.

2. The angular leaf spot of cotton is caused by ————.

3. The luminescent bacterial species in marine environment are grouped under ಬಂತು genera.

4. Define amensalism

5. The soil type that has smallest particle size and good water storage qualities is ————.

6. What is Hartignet ?

7. Differentiate parasitism and predation.

8. What is rhizoplane ?

9. What is biological weathering ?
10. What is nematophagy ?
1i. Name a free living nitrogen fixing bacteria.
12. What are biofilms ?

(12 x %=6 marks)
Section B
Answer all questions.
Each question carries 2 marks.

13. How soil inhabiting fungi are different from root inhabiting fungi ?
14. What are phosphatases ?

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