Bota 271: Plant Physiology 1 Question Paper
Bota 271: Plant Physiology 1
Course:Bachelor Of Science
Institution: Chuka University question papers
Exam Year:2013
CHUKA
UNIVERSITY
UNIVERSITY EXAMINATIONS
SECOND YEAR EXAMINATION FOR THE AWARD OF DEGREE OF
BACHELOR OF EDUCATION (SCIENCE) AND BACHELOR OF SCIENCE (SCIENCE)
BOTA 271: PLANT PHYSIOLOGY 1
STREAMS: B.E.d (Sc.) & B.Sc (Sc) Y2S2 TIME: 2 HOURS
DAY/DATE: FRIDAY 9/8/2013 11.30 AM – 1.30 PM
INSTRUCTIONS:
Answer all questions in Section A and any two in Section B.
Use illustrations where appropriate to enhance your answers.
1. (a) Define the term colloid. [1 mark]
(b) Briefly describe the composition of two colloids occurring in cells of living organisms. [2 marks]
(c) Give the constituent units f the following molecules:
(i) sucrose
(ii) starch
(iii) lactose
(iv) cellulose [2 marks]
2. (a) Explain briefly the molecular structural similarity between phospholipids and triglycerides. [3 marks]
(b) Describe the unfavorable consequences within the cells of organisms if phospholipids were hydrophilic. [2 marks]
3. In respect to plant physiology differentiate between sources and sinks and give two examples for each. [5 marks]
4. (a) Explain the relationship between enzyme concentration and rate of conversion of substrate to product. [3 marks]
(b) Describe allosteric control of cellular metabolism. [7 marks]
5. Describe the process of water absorption from the soil to the xylem of vascular plants. [5 marks]
Section B (40 Marks)
6. Expound on the cohesion- tension theory. [20 marks]
7. Write an essay on the Calvin Cycle. [20 marks]
8. Discuss cytokinins. [20 marks]
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