LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.
SUPPLEMENTARY EXAMINATION – JUNE 2007
PB 5500 - PLANT PHYSIOLOGY
Date & Time: 25/06/2007 / 9:00 - 12:00
Dept. No.
Max. : 100 Marks
PART – A (20 marks)
I Choose the correct answer
1. Water potential of pure water is always
a. Less negative
b. More negative
(5 x 1 = 5)
c. Zero
2. The electron carrier which contains copper is
a. Quinone
b. Ferredoxin
c. FAD
3. In photorespiration, glycolate is synthesized at
a. Chloroplast
b. Mitochondria
c. Peroxysome
d. One
d. NADH
d. Glyoxysome
4. Which one of the following is a cofactor in oxidative decarboxylation?
a. Lipoamide
b. Nicotinamide
c. Flavin
c. Mn
5. Apical dominance is a combined action of
a. Auxin, cytokinin
b. Auxin, gibbrellic acid
c. Cytokin, gibberellic acid d. Gibberellic acid, ABA
II State whether the following are true or false:
(5 x 1 = 5)
6. Starch does not create osmotic pressure.
7. Tracer elements are detected by atomic absorption spectrophotometer.
8. RUBISCO is a bifunctional enzyme.
9. The site of glycolysis is mitochondrial matrix.
10. ABA is involved in drought tolerance.
III Complete the following:
(5 x 1 = 5)
11. The properties of water --------- and --------- tends to absorb water in plants.
12. Die back disease is caused by the deficiency of ---------.
13. ---------------- inhibits photolysis of water during light reaction.
14. Examples for symbiotic, non-leguminous nitrogen fixer is ---------- and ----------.
15. Bacanae is a disease related with ---------------- phytohormone.
IV Answer the following in 50 words each:
Write notes on:
16. Water potential
17. Knop’s solution
18. Law of limiting factors
19. Leghaemoglobin
20. Chlorophyll preservation test
(5 x 1 = 5)
PART – B
Answer any five of the following, each within 350 words.
(5 x 8 = 40)
21. Bring out the salient features of “Z’ scheme.
22. Define osmotic potential. How is it determined?
23. Write down the roles and deficiency symptoms of microelements in the form of tabular
column.
24. Explain the concept of salt respiration.
25. Give the energy budget for oxidation of 1 mole of glucose.
26. Describe the activities of NR and NiR.
27. Write notes on photoperiodism. Give examples.
28. Briefly explain the physiological roles of cytokinin in plants.
PART – C
Answer the following, each within 1500 words.
29. (a) With suitable theories, explain stomatal mechanics.
OR
(b) Explain the dark reactions of C3 plants.
30. (a) Write detailed notes on the biochemistry of nitrogen fixation.
OR
(b) Describe the physiology of drought tolerance in plants.
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