LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & BIOTECHNOLOGY

IB 24

SIXTH SEMESTER – APRIL 2006

                                        PB 6604 – PLANT DISEASES AND MANAGEMENT

(Also equivalent to PB 5501)

 

 

Date & Time : 19-04-2006/FORENOON     Dept. No.                                                       Max. : 100 Marks

 

 

Part – A

 

Answer the following                                                                                     (20 marks)

 

I Choose the best answer                                                                                (5 ´ 1 = 5)

 

1. Cork layers are produced due to the infection by
2. Prunus domestica b. Nicotiana tobaccum c. Oryza sativa d. Triticum aestivum

 

2. Die back disease of citrus caused by the deficiency of
3. Mg b. K                 c. N                 d. Cu

 

3. Uredospores of Puccinia graminis are
4. Two celled, uninucleated b. One celled, binucleated
5. Two celled, binucleated d. One celled, uninucleated

 

4. The term infestation is associated with:
5. Viruses b. Bacteria       c. Fungi           d. Insects

 

5. Topical fungicides applied in
6. Soil b. Entire plant             c. Parts of plant           d. Seed treatment

 

II State whether the following statements are true or false.                           (5 ´ 1 = 5)

 

6. Mosaic is the symptom for mycoplasmal diseases.
7. Compound interest disease completes more than a cycle during the life period of host.
8. Physiological diseases are caused due to viruses.
9. Bengal famine is caused due to Phytophthora infestans.
10. 20 – 26 ˚C temperature and 90 % humidity favours blast disease.

 

III Complete the following.                                                                            (5 ´ 1 = 5)

 

11. Alternaria solani produces an injurious chemical substance in tomato is ———-.
12. Anthracnose is a symptom for the pathogen ———–.
13. The sexual phase of Pyricularia oryzae is —————- ————.
14. Spermagonium and aecium are seen in the disease ————-.
15. Oxanthiins and benzimidazoles are examples of ———— fungicides.

 

 

 

 

 

IV Answer the following in not more than 50 words each.                           (5 ´ 1 = 5)

 

16. Name the contributions of E.J. Buttler
17. Distinguish alternate and collateral hosts
18. Expand RTBV and RTSV
19. Write note of root knot disease.
20. Give the importance of chitinase and α-amylase inhibitor

 

Part – B

 

Answer any FIVE of the following in not more than 350 words each.      (5 ´ 8 = 40)

 

21. How are inanimates cause disease in crops?
22. Describe the hypertrophy and hyperplasia symptoms in plants
23. Give an account of pathogens, symptoms and control measures of tikka disease.
24. Briefly explain the disease smut of wheat.
25. Write short notes on galls.
26. Describe tungro disease of rice.
27. 27. Write the basic steps in the development of Bt
28. Explain the various causes of epidemics.

 

 

Part – C

 

Answer the following in not more than 1500 words each.                 (2 ´ 20 = 40)

 

1. (a) Write an essay on the various events of pathogenesis.

Or

(b) Explain the pathological life cycle of damping off disease.

 

1. (a) Enumerate the characters of mycoplasma. Add note on the little leaf of brinjal.

Or

(b) Describe the therapeutic measures to control diseases.

 

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