LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

         B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

ED 07

FIFTH SEMESTER – November 2008

PB 5509 – PLANT PHYSIOLOGY

 

 

 

Date : 03-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART-A (20 marks)

1. Choose the correct answer: (5 x 1 = 5 marks)

 

1. Guttation occurs through

• Hydathodes (b) Stems         (c) Roots          (d) Lenticels

2. Light reaction takes place in the

• Stroma (b) grana         (c) lamella       (d) matrix

3. The hormone responsible for fruit ripening is

• ABA (b) Auxin          (c) Ethylene     (d) Gibberellic acid

4. Glycolysis takes place in the

• Cytoplasm (b) Mitochondria (c) Chloroplast            (d) Golgi bodies

5. The enzyme nitrogenase is highly sensitive to

• Nitrogen (b) Argon         (c) Oxygen       (c) Halogen

 

1. State whether the following statements are True or False: (5 x 1 = 5 marks)

 

6. Water potential is the sum of solute, matric and pressure potential.
7. Calcium is responsible for the formation of cell wall.
8. Photolysis of water is associated with Photosystem I.
9. Lysosomes are linked with photorespiration
10. Flowering depends on the ration of P_r to P_fr

 

• Complete the following: (5 x 1 = 5 marks)

 

11. The movement of water from the soil to plants through the living cells is called ____________.
12. Active uptake of minerals is dependent on ______________.
13. 2, 4-D is a selective _______________.
14. The symbiotic nitrogen-fixing bacterium in the root nodules is ______________.
15. Bolting is associated with _________________.

 

• Answer the following in 50 words: (5 x 1 = 5 marks)

 

16. Comment on Antitranspirants.
17. Write a note on Kranz Anatomy
18. Definef SPAC.
19. What is the relation to carbon with respect with respect to nitrogen metabolism?
20. What are the characteristics of salinity on crop plants?

 

 

 

 

PART-B

 

Answer any FIVE of the following in about 350 words:                                       (5 x 8 = 40 marks)

 

21. Enumerate the theories related to active uptake of solutues.
22. What are the different types of dormancy and write a note on the methods to break dormancy.
23. How are amino acids synthesized?
24. Explain cyclic photophosphorylation.
25. Write short notes on Gluconeogenesis.
26. Describe the theories associated with stomatal movement.
27. Elaborate on glycolate pathway.
28. Describe the metabolism in CAM plants.

PART-C

 

Answer the following questions in about 1500 words:                              (2 x20 = 40 marks)

 

29. (a) Illustrate the types of C₄ Compare C₃ with C₄ plants.

(OR)

• What is the fate of pyruvic acid in the presence of oxygen?

30. (a) Give the bioassays, mechanism of action and application of auxins.

(OR)

• Discuss in detail the physiology of flowering.

 

 

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