Download LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.
FIFTH SEMESTER – APRIL 2008
PB 5500 - PLANT PHYSIOLOGY
Date : 28/04/2008
Time : 1:00 - 4:00
Dept. No.
KL 19
Max. : 100 Marks
PART – A (20 marks)
I. Choose the correct answer:
5x1=5
1. Wilting of a plant results from excessive;
(a) absorption
(b) respiration
(c) transpiration
(d) imbibition
2. The organic acid accumulates in CAM plants is
(a) Pyruvic acid
(b) Malic acid (c) acetic acid
(d) Fumaric acid
3. Vernalization refers to the treatment of
(a) Cold
(b) heat
(c) Boiling
(d) Acid
4. Death of stem and root tips occur due to deficiency of
(a) Phosphorus
(b) Nitrogen
(c) Iron
(d) Calcium
5. The site of dark reaction in chloroplast is
(a) Thylakoid
(b) stroma
(c) Grana
(d) Lamella
II. State whether the following statements are True or False
5x1=5
6. The enzymes of Kreb’s cycle are found in matrix of mitochondria.
7. Kranz anatomy is seen in C3 plants.
8. 2,4-D is a synthetic growth regulator.
9. Phytochrome is active in blue light.
10. Absence of magnesium from plant tissue results in chlorosis.
III. Complete the following
5x1=5
11. Exchange of gases takes place by the mechanism of ____________
12. Photorespiration occurs in _________ plants.
13. The photosynthetic units present in the unit membrane of granum disc are _____
14. The common phase between aerobic and anaerobic respiration is called ________
15. Seed dormancy is broken by the hormone __________
IV. Answer the following in about 50 words
5x1=5
16. What is Donnan’s equilibrium?
17. Comment on apoplast and symplast.
18. What is law of limiting factors?
19. Define Bio-assay.
20. What are trace elements?
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PART – B
Answer any FIVE of the following in about 350 words.
5 x 8 = 40
21. Describe the cyclic and non-cyclic photophosphorylation with suitable illustrations.
22. Write notes on the synthesis of aminoacids.
23. Write down the physiological role of Auxins.
24. Describe briefly physiology of flowering with illustrations.
25. Enumerate the reasons for seed dormancy. List out the methods to break it.
26. Illustrate only the reactions of C4 cycle.
27. Describe the theory of photosynthesis for stomatal movement.
28. Discuss briefly about the reduction of nitrates in plant tissue.
PART – C
Answer the following questions in about 1500 words.
2 x 20 = 40
29. (a) Explain the theories regarding active absorption of minerals.
(or)
(b) Explain and illustrate CO2 fixation process in C3 plants.
30. (a) Explain Glycolysis with suitable illustrations.
(or)
(b) Write an essay on the effect of drought on crop plants.
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