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Bota 271/202: Plant Physiology I Question Paper

Bota 271/202: Plant Physiology I

Course:Bachelor Of Education Science

Institution: Chuka University question papers

Exam Year:2013

CHUKA

UNIVERSITY

UNIVERSITY EXAMINATIONS
SECOND YEAR EXAMINATIONS FOR THE AWARD OF DEGREE IN BACHELOR OF EDUCATION (SCIENCE) AND BACHELOR OF SCIENCE (AGED) , (WIEM)
BOTA 271/202: PLANT PHYSIOLOGY I
STREAMS: Y2S2 TIME: 2 HOURS
DAY/DATE: MONDAY 22/4/2013 8.30 AM – 10.30 AM
INSTRUCTIONS:

• The paper consists of two sections. Section A and section B
• Answer all the questions in section A (30 marks) and any other two questions in section B (40 marks)
• Adhere to the instructions in the answer booklet
• Do not write on the question paper.
•
SECTION A (30 MARKS)

QUESTION ONE

(a) Explain the meaning of the following terms: [2 Marks]

(i) Colloid

(ii) Hydrophilic substance.

(b) Briefly explain the factors that influence the rate of dissolution of a compound.
[2 Marks]

(c) Name four types of hydrocolloids derived from a natural source. [2 Marks]

QUESTION TWO

(a) Outline and illustrate characteristic features of aldose carbohydrates. [3 Marks]

(b) Describe the cyclization of a named Ketose sugar to produce a furanose using a diagram.
[2 Marks]

(c) Define the term mutarotation as used in carbohydrate structuring. [1 Mark]

QUESTION THREE

(a) Name any four enzymes involved in starch remobilization and state their functionary mechanisms. [2 Marks]

(b) Briefly describe the breakdown of cellulose by some groups of bacteria and fungi.
[2 Marks]

(c) Outline the role of the enzyme active sites in the process of catalysis. [2 Marks]

QUESTION FOUR

(a) Describe the beneficial effect of mycorhizal association to both the plant and the fungus. [2 Marks]

(b) Distinguish between osmotic potential and water potential. [2 Marks]

(c) Define the following terms as used in plant water relations.

(i) Guttation [1 Mark]

(ii) Imbibation [1 Mark]

QUESTION FIVE

(a) Outline the basic steps that occur in light dependent reactions during the process of photosynthesis. [2 Marks]

(b) State one major functions of each of the following hormones in plants.

(i) Ethylene [1 Mark]

(ii) Gibberellins [1 Mark]

(c) State the role of the enzyme hexokinase in the process of glycolysis. [2 Marks]

SECTION B (40 MARKS) – ANSWER ANY TWO QUESTIONS

QUESTION SIX

Describe the role of temperature, enzyme cofactors and enzyme inhibitors in the rate of enzyme
controlled reactions. [20 Marks]

QUESTION SEVEN

Describe the chemical activities of monosaccharide carbohydrates under the subheadings
enolisation, oxidation and epimerization. [20 Marks]

QUESTION EIGHT

Discuss water uptake by plants. [20 Marks]

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Bota 271/202: Plant Physiology I Question Paper

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