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Sbe2253:Plant And Crop Physiology Question Paper

Sbe2253:Plant And Crop Physiology

Course:Bachelor Of Crop Protection

Institution: Meru University Of Science And Technology question papers

Exam Year:2013

QUESTION ONE – 30 MARKS
(a) State the six classes of enzymes according to international classification of enzymes and briefly describe the type of reactions they catalyze. (6Marks) (b) Describe briefly the major metabolic rates of glucose in vascular plants and animals. (4Marks) (c) Describe the reaction in which pyruvate is converted to Acetyl CoA. (5Marks) (d) The light used by vascular plants for photosynthesis has a wave length of about 700nm. Calculate the energy in a ‘mole’ of photons (an eintein) of light of this wavelength, (given that h=6.626 x10-34J.s and C= 3.0x108 m/s) (5Marks) (e) Describe how ammonia produced by nitrogen fixation is converted to organic nitrogen. (5Marks) (f) Describe how the levels and activities of various hormones change dramatically during seed development. (5Marks)
QUESTION TWO – 20 MARKS
Describe the reactions of the citric acid cycle/TCA/Krebs cycle. (20Marks)
QUESTION THREE – 20 MARKS
(a) Describe the biosynthesis of the hormone Auxin (11Marks) (b) Explain how the hormone auxin is involved in plant development. (9Marks)
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QUESTION FOUR – 20 MARKS
Describe the light driven electron flow in purple bacteria and green sulphur bacteria. (20Marks)
QUESTION FIVE– 20 MARKS
(a) Describe the biosynthesis of ethylene in higher plants. Include the Yang cycle. (13Marks) (b) Describe the cytokinin signaling chain. (7Marks)

Sbe2253:Plant And Crop Physiology Question Paper

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