LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

FIFTH SEMESTER – NOVEMBER 2010

PB 5515 – PLANT PHYSIOLOGY

 

 

 

Date : 29-10-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

                                                              PART – A                                                                (20marks)

Answer ALL the questions                                                                                (5×1=5)

1. Choose the correct answer
2. The adsorption of water by hydrophyllic colloids is known as
3. a) Osmosis b) Imbibition             c) Plasmolysis          d) Turgidity
4. Magnesium is essential for the formation of which pigment?
5. a) Phycobilins b) Carotenes              c) Chlorophyll         d) xanthophyll
6. Non-cyclic photophosphorylation requires
7. a) PS I b) PS II                    c) PS I&PSII           d) Noneof these
8. Glycolysis takes place in the
9. a) Mitochondria b) Chloroplast          c) Cytoplasm          d) Nucleus
10. Ripening of fruits is associated with
11. a) Gibberellins b) Cytokinins            c) Ethylene             d) Auxin

 

1. State whether the following statements are True or False.     (5×1=5)
2. Silicone oils act as Antitranspirants .
3. Donnan equilibrium is an example of passive absorption.
4. Lysosomes are involved in Photorespiration.
5. The light reaction takes place in the stroma of the chloroplast.
6. Florigen is a flowering hormone.

III. Complete the following                                                                                                              (5×1=5)

11. Exudation of water from plants in the form of liquid is called_______.
12. Active absorption of solutes requires metabolic ___________.
13. Kranz anatomy is observed in _________plants.
14. Symbiotic nitrogen fixation is carried out by the bacterium________.
15. An example of a Short Day plant is _________.

 

 

1. Answer the following each in 50 words.                         (5×1=5)
2. What is Symplast?
3. What is meant by Photolysis of water?
4. Give two deficiency symptoms of Boron.
5. Mention any two effects of drought on plants.
6. Define transamination.

PART-B                                      (5×7=35marks)

Answer the following each answer not exceeding 500 words.

Draw diagrams wherever necessary.

21. a).Describe the types of transpiration and state its significance.

(or)

1. b) Show the relationship between the components of Water potential.
2. a). Mention any two symptoms of any three Macroelements.

(or)

1. b) Explain Donnan equilibrium.
2. a).Explain Cyclic Photophosphorylation.

(or)

1. b) Discuss the metabolism of CAM plants.
2. a) Draw the Krebs cycle and tabulate the number of ATP produced.

(or)

1. b) Highlight the mechanism of Photorespiration.
2. a) Enumerate the applications of Gibberellins.

(or)

1. b) Discuss the phenomenon of Vernalisation.

PART- C                                            (3×15=45marks)

  Answer any Three of the following, each answer not exceeding 1200 words. 

   Draw diagrams wherever necessary.

26. Trace the path of water from the time it enters the root hair and reaches the leaves.
27. Write notes on the mechanism of absorption of mineral salts.
28. Explain the mechanism of symbiotic Nitrogen fixation. Highlight the importance of Nitrogen to

plants.

29. Trace the path of carbon via the Calvin cycle.
30. Define Dormancy.Explain the factors causing dormancy and the methods to break dormancy.

 

 

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