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Agro 232: Crop Pathology Question Paper

Agro 232: Crop Pathology

Course:Bachelor Of Science In Agriculture

Institution: Chuka University question papers

Exam Year:2013

UNIVERSITY EXAMINATIONS
SECOND YEAREXAMINATION FOR THE AWARD OF
DEGREE OF BACHELOR OF SCIENCE AGRICULTURE
AGRO 232: CROP PATHOLOGY
STREAMS: BSC (ANSC) Y2S2 TIME: 2 HOURS
DAY/DATE: FRIDAY 9/8/2013 11.30AM – 1.30 PM
INSTRUCTIONS:

1. This Paper has Two Sections A And B
2. Section A accounts for 30 Marks while Section B accounts for 40 Marks
3. Section A is Compulsory
4. Answer any Two Questions in Section B

SECTION A

1. Briefly explain the following terms [10 marks]

(a) Plant disease
(b) Disease syndrome
(c) Facultative parasite
(d) Biotic plant diseases
(e) Pathogenesis

2. Describe the functions of a healthy plant, for each function give an example of the part involved. [8 marks]

3. Explain the scientific basis for plant pathology being referred to as the study of a suffering plant. [2 marks]

4. Write short notes on the following:

(a) Disease development and disease triangle [6 marks]
(b) Parasitic relationships [4 marks]

SECTION B

5. During infection, pathogens release biologically active compounds which affect host cells.

(a) From the disposition above, what is infection [4 marks]

(b) Parasitic relationships [4 marks]

(c) Discuss plant defence mechanism. [10 marks]

6. (a) Describe the procedure for identifying an unknown disease. [8 marks]

(b) Enumerate non-infectious agent. [2 marks]

(c) Discuss the mechanism used by pathogens to attack plants. [10 marks]

7. (a) Describe late bright of potatoes indicating the causal agent, host range and disease
development. [8 marks]

(b) Outline methods for plant disease management. [6 marks]

(c) Briefly explain the factors affecting choice of mode of control. [6 marks]
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Agro 232: Crop Pathology Question Paper

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