M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
First Semester
Botany
MICROBIOLOGY AND PLANT PATHOLOGY
(CBCS 2016 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all the questions.
1. Teichoic acid.
2. Binary fission.
3. Phytoplasma.
4. Penicillin.
5. Haustorium.
6. Disease triangle.
7. Pathogen.
8. Trichoderma viride.
9. Citrus canker.
10. Red rot.
Sub. Code
525103
RW-867
2
sp3
Part B x 5 25)
Answer all the questions choosing either or
11. Describe the morphological characteristics of
bacteria.
Or
What are the economic importance of bacteria?
12. Describe the procedure used for purification of
viruses.
Or
Write a short essay on the beneficial enzymes
produced by bacteria.
13. What is epidemics? Briefly describe the methods of
studying plant diseases.
Or
What is disease forecasting? Write is its usefulness
in disease prevention.
14. Write an essay on the organisms used in biological
control of plant diseases.
Or
Explain how to control pathogenic organisms using
crop rotation.
15. Write the causal agent and development of rust
disease in wheat and its control measures.
Or
Write the etiology of Bunchy top virus of banana.
RW-867
3
sp3
Part C x 10 30)
Answer any three questions.
16. Describe the reproduction methods in bacteria with neat
diagrams.
17. Write detailed notes on microbial products and its uses.
18. Write a detailed essay on the types of plant diseases and
disease cycle.
19. Write an essay on chemical and biological control of plant
diseases and its advantages and disadvantages.
20. Write an account on causal agent, pathogenesis and
reproduction of anthracnose disease of mango and
Downey mildew of grapes.
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