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Agro 211: Crop Environment And Physiology Question Paper

Agro 211: Crop Environment And Physiology

Course:Bachelor Of Science In Agriculture

Institution: Chuka University question papers

Exam Year:2013

UNIVERSITY EXAMINATIONS

SECOND YEAR EXAMINATION FOR THE AWARD OF
DEGREE OF BACHELOR OF SCIENCE IN AGRICULTURE

AGRO 211: CROP ENVIRONMENT AND PHYSIOLOGY

STREAMS: BSC (AGRIC) Y2S2 TIME: 2 HOURS

DAY/DATE: WEDNESDAY 7/8/2013 11.30AM – 1.30 PM
INSTRUCTIONS:

Answer all Questions in Section A and any Other Two Questions in Section B

SECTION A (TOTAL 30 MARKS)

1. (a) Define the following terms:

(i) Potential evapotranspiration [1 Marks]
(ii) Soil mapping unit [1 Mark]
(iii) Precipitation [1 Mark]
(iv) Agro ecological zones [1 Mark]
(v) Thermal regime [1 Mark]

(b) Explain briefly the role of nitrogen in plants. [6 Marks]

2. Briefly discuss the role of blue light responses in plants. [8 Marks]

3. Describe briefly the steps in phloem unloading. [6 Marks]

4. Write short notes on Crassulacean acid metabolism (CAM) in plants. [5 Marks]

SECTION B (TOTAL 40 MARKS)

5. Discuss on agro-ecological zones in Kenya when rainfall is used as a basis.
[20 Marks]

6. Describe Auxins and Gibberellins as plant growth regulators. [20 Marks]

7. Discuss the 3 main stages of the Calvin cycle. [20 Marks]
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