LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
U.G. DEGREE EXAMINATION – PLANT BIOLOGY & BIOTECHNOLOGY
SIXTH SEMESTER – APRIL 2012
PB 6608/PB 6604 – PLANT DISEASES AND MANAGEMENT
Date : 16-04-2012 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
PART – A
Answer the following each in about 50 words: (10 x 2 = 20)
- Define infection.
- What is meant by secondary inoculums?
- What are phytoalexins?
- What is hypersensitivity.
- Write about the causal organism for Club root of cabbage.
- What is Acervulus?
- Name the pathogen and control measure for Blight of rice.
- Write notes on galls.
- Give the composition of Bordeaux mixture.
- What is meant by Field sanitation?
PART – B
Answer the following each answer not exceeding 500 words:
Draw diagrams wherever necessary: (5 x 7 = 35)
- a. Discuss the role of growth regulators in the development of plant disease.
(or)
- Explain Koch’s postulates.
- a. Discuss the role of light and temperature in disease development.
(or)
- Write notes on:
(i) Natural openings
(ii) Deposition of gums
- a. Write an account on Tikka disease of groundnut.
(or)
- Describe briefly about the disease caused by Puccinia graminis tritici.
- a. Briefly describe any one viral disease you have studied.
(or)
- Write short notes on Cuscuta.
- a. Give an account of quarantine regulations.
(or)
- Explain soil and seed treatment for eradication of plant diseases.
PART – C
Answer any three of the following each answer not exceeding 1200 words.
Draw diagrams wherever necessary. (3 x 15 = 45)
- Describe the morphological and anatomical changes in the host plant due to pathogenesis.
- Give a detailed account on Induced histological defence mechanism.
- Discuss in detail about Blast of rice.
- Explain the pathogen, symptoms and control measures of Citrus canker.
- Write an essay on the biological control of plant diseases.
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