M.Sc., DEGREE EXAMINATION, APRIL 2018
First Semester
Botany
MICROBIOLOGY AND PLANT PATHOLOGY
(CBCS 2017 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 X 2 20)
Answer all the questions.
1. Prions
2. Bacteriophages
3. Autotrophs
4. Pili
5. Obligate parasite
6. Aflatoxins
7. Anthracnoses
8. Galls
9. Appressorium
10. Capsid.
Sub. Code
7MBO1C3
AFS-0596
2
ws1
Part B X 5 25)
Answer all the questions, choosing either or
11. With labeled diagram describe the structure of
Virus.
Or
Describe the characteristics of mycoplasma.
12. Describe briefly the ultra-structure of bacterial cell.
Discuss its prokaryotic characters.
Or
Write notes on the bacterial culture techniques.
13. Explain the postulates of Robert Koch.
Or
Describe the biochemical defense mechanism in
plants.
14. Describe the causal organism, symptoms and
control methods of Downy mildew of grapes.
Or
Comment on the causative organisms, etiology of
Rice Blight.
15. Explain the characteristics of normal and abnormal
cells during pathogenesis.
Or
Discuss in detail host parasite interaction and their
significances.
AFS-0596
3
ws1
Part C 10 30)
Answer any three questions.
16. Write an account on economic importance of Viruses.
17. Describe the various methods of reproduction in bacteria.
18. What are the different morphological defense
mechanisms in plants? Give suitable examples.
19. Describe the causal organism, symptoms and control
methods of Rice blight and white Rust of mustard.
20. Explain the entry mechanism of various pathogens in a
plant cell.
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