LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

FIFTH SEMESTER – APRIL 2011

PB 5515/PB 5509/PB 5500 – PLANT PHYSIOLOGY

 

 

 

Date : 11-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

 

PART A(20 marks)

ANSWER ALL THE QUESTIONS

1. Choose the correct answer                                                                                     (5 x 1 =5)
   1. The antitranspirant that induces complete stomatal closure is
2. Gibberellic acid Auxin        c. Ethylene                d. Abscisic acid.
3. The accessory pigments in photosynthesis is
4. Anthocyanin Carotenoids         c. Bilirubin    d. Betacyanin.
5. The raw material for Gluconeogenesis
6. Glucose                          sucrose                 c. starch        d. fatty acid
7. The plant hormone that is associated with inducing dormancy is
8. Auxin   G A₃                      c.  Cytokinin             d. Abscisic acid.
9. The micro nutrient that is important for the synthesis of IAA is,
10. Zinc Molybdenum                   c. Cobalt                   d. Iron.

 

1. State whether the following statements are True or False:             (5×1=5)
2. Chemiosmotic hypothesis explains the regeneration of ATP.
3. Donnan membrane Equilibrium concept explains the absorption of mineral ions against the concentration gradient.
4. Vernalization is the cold treatment which suppresses the flowering.
5. CAM plants are also known as C₄
6. Apoplast includes the entire living component.

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

11. The hormone that induces chlorophyll biosynthesis is __________________.
12. The mineral element _______________ is present in the centre of the chlorophyll pigment.
13. Glycolysis takes place in the __________________ of the cell.
14. _________________ is an obligate vernalization requiring plant.
15. The ultimate donor of electron in photosynthesis is _________________.
16. Answer all, each in about 50 words.                                     (5×1=5)
17. What is Glycolate pathway?
18. What is bioassay?

 

18. Define Respiratory Quotient.
19. Differentiate Apoplast and Symplast.
20. Explain interveinal chlorosis and mention its causes.

 

PART B

Answer the following, each within 500 words, Draw diagrams wherever necessary.       (5×7=35)

21. a) What is guttation?

(or)

1. b) Define water potential and bring out the relationship between matrix potential, osmotic potential and pressure potentials.
2. Explain how ammonia is assimilated in plants.

(or)

Draw and explain the symbiotic nitrogen fixation.

23. Differentiate between passive and active absorption of mineral ions and explain any one hypothesis for each.

(or)

Explain the mechanism of photorespiration.

24. Schematically represent the light reaction of photosynthesis and explain the important steps.

(or)

Bring out the differences between C₃ and C₄ plants.

25. What is dormancy of seeds? Explain the various causes of dormancy.

(or)

What is stress physiology?  Explain the causes of stress in plants.

PART C                                

Answer any Three of the following, each within 1500 words only.

Draw diagrams and flowcharts wherever necessary.                                                   (3×15=45)

 

26. Explain the Bioassay and physiological roles of auxins and gibberellins.
27. What are macro and micro nutrients? Explain the occurrence, deficiency symptoms and the roles of any three macro and any three micro nutrients.
28. Explain how a molecule of glucose is completely oxidized during aerobic respiration.
29. Explain the path way of C₃ photosynthesis and the significance of CAM plants.
30. Explain the structure and the mechanism of opening and closing of stomatal apparatus. Explain the various hypothesis associated with stomatal movement.

 

 

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