LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

VE 16

FIFTH SEMESTER – April 2009

PB 5509 / 5500 – PLANT PHYSIOLOGY

 

 

 

Date & Time: 16/04/2009 / 9:00 – 12:00 Dept. No.                                                       Max. : 100 Marks

 

 

PART – A                                          (20 MARKS)

1. CHOOSE THE CORRECT ANSWER.

 

1. Dark reaction takes place in ________ of chloroplast.
2. Thylakoid Stroma         c. Grana           d. Frets.
3. Enzymes required for respiration are found in
4. Glyoxysome b) Mesophyll   c) Mitochondria                      d) Peroxisome
5. The End Product of Glycolysis is
6. a) Pyruvic Acid b) Acetic Acid           c) Oxalo Acetic Acid                                        d) Phosphoglyceric  Acid
7. Parthenocarpy is brought about by
8. Cytokinin b) Ethylene      c) Gibberellins             d) Abscissic  Acid
9. Chlorosis occurs due to the deficiency of
10. Copper b) Iron             c) Phosphorous                        d) Boron

 

1. STATE WHETHER THE FOLLOWING STATEMENTS ARE TRUE OR FALSE

 

6. The first stable compound produced in Calvin cycle is 3-phosphoglyceric
7. Photorespiration is called C₃
8. Auxins are used as weed killers.
9. Vernalization shortens the vegetative period of the plants.
10. Seeds, that, wait for suitable environmental condition to germinate are said to be QUIESCENT.

 

• COMPLETE THE FOLLOWING:

 

11. C₄ plants exhibit _____________ anatomy of leaves.
12. _________ is the precursor for Auxin.
13. In CAM cycle the first product is _______ Acid.
14. The germination by red-light and inhibition by far-red light involves the operation of a proteinaceous pigment called ___________.
15. In the presence of light water gets dissociated into Hydrogen ions & Hydroxyl ions. This is called ___________.

 

1. ANSWER THE FOLLOWING EACH WITH IN 50 WORDS.

 

16. Define water potential?
17. What are Quantosomes?
18. What ate Cytochromes?
19. What is the significance of Photo respiration?
20. Explain?

PART – B                                          (5 x 8 = 40 marks)

ANSWER ANY FIVE OF THE FOLLOWING.  EACH NOT EXCEEDING 350 WORDS.

 

21. What is Transpiration. What are its kinds. Also add notes on Antitranspirants.
22. Explain Donnan’s Equilibrium.
23. Explain the Glycolate Pathway.
24. Explain Trans amination.
25. What are the causes for Dormany.
26. Explain Photoperiodism.
27. Give a brief account of Bioassay for Auxins.
28. Explain the effects Vernalization.

PART – C                              (2 X 20 = 40 MARKS)

ANSWER THE FOLLOWING, EACH NOT EXCEEDING 1500 WORDS.  DRAW DIAGRAMS WHEREVER NECESSARY.

 

 

29. Write an essay on Biological Nitrogen Fixation.

 

(or)

Explain the Kreb’s cycle.

 

30. Write down the practical uses of the hormones
31. Auxins b) Gibberelins              c) Cytokinins                           d) Ethylene

 

(or)

Write an essay on cyclic photophos phorylation.  Mention a note on its significance.

 

 

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