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Sbt 422: Plant Virology Question Paper

Sbt 422: Plant Virology

Course:Bachelor Of Science In Plant And Microbiology

Institution: Kenyatta University question papers

Exam Year:2010

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2010/2011
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE
SBT 422: PLANT VIROLOGY

DATE: TUESDAY, 23RD NOVEMBER 2010 TIME: 8.00 A.M. - 10.00 A.M.

INSTRUCTIONS:

a) Answer ALL questions in Section A. Answers should be written in the spaces provided. Each question is 5 marks.
b) Write an essay on ONE question in Section B (30 marks)

SECTION A
1. Why are symptoms not a conclusive criterion for diagnosis of plant viruses? Refer to relevant examples.
2. Define the following terms:
a) Longevity of a virus in vitro
b) Cross-protection
3. How can avoidance of sources of infection be a means of virus disease control?
4. Outline strategies employed in the control of virus vectors.
5. Outline quantitative and qualitative losses associated with plant viruses.
6. What are the major components of a plant virus?
7. Write the cryptogram for maize streak whose molecular weight of genome is unknown and also percentage of nucleic acid in infective particle.

8. What is the causal agent of the following diseases
a) Cadang-cadang ……………

b) Potato spindle Tuber ………

c) Aster Yellows ………………

d) Coconut lethal yellowing ….

e) Ground Rosette ……………

SECTION B: ESSAY (30 MARKS)

1. Discuss transmission of plant viruses using relevant examples.
2. Discuss classification of isometric viruses.
3. Write an essay on phytoplasmas.

Sbt 422: Plant Virology Question Paper

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