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Kst 302: Plant Pathology And Management. Question Paper

Kst 302: Plant Pathology And Management.

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2013

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2012/2013
SECOND SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN AGRICULTURE.
KST 302: PLANT PATHOLOGY AND MANAGEMENT.
DATE: Thursday, 4th APRIL, 2013
TIME: 11.00 A.M-1.00 P.M
INSTRUCTIONS:
Answer ALL questions in this section.
Each question is 5 marks.
1. Define the following terms.
i. Pathogen
ii. Symptoms
iii. Infection
iv. Predisposition
v. Virulence [5 marks]
2. Briefly explain above-ground and below-ground symptoms associated with plant viruses.
[5 marks]
3. State the Koch postulates and outline their importance in plant pathology. [5 marks]

4. Explain ‘the gene for gene’ concept as it relates to plant pathology. [5 marks]

5. Outline the objectives of remote sensing in plant pathology. [5 marks]

6. Outline the various stages in the development of infection or disease cycle. [5 marks]

7. Explain the essential consideration in plant disease management. [5 marks]

8. Briefly explain how plant pathogens interfere with the process of transpiration. [5 marks]

SECTION B
Answer any two questions (30 marks)
9. Discuss the role of growth regulators in plant parthenogenesis.

10. Citing relevant examples, discuss the various defenses mechanisms in plants against plant
diseases.
11. Discuss the essential components of an epiphytotic (epidemiology) to occur.

12. Enzymes are large protein molecules which catalyze all inter-related reactions in the living cell. Discuss the role of enzymes in parthenogenesis.

Kst 302: Plant Pathology And Management. Question Paper

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