LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

IB 33

DEGREE EXAMINATION –PLANT BIOLOGY & PLANT BIO-TECH.

FIFTH SEMESTER – APRIL 2007

PB 5500 – PLANT PHYSIOLOGY

 

 

Date & Time: 27/04/2007 / 1:00 – 4:00          Dept. No.                                                     Max. : 100 Marks

 

 

 

Part – A (20 marks)

 

Answer all the questions.

I  Choose the best answer                                                                   (5 x 1 = 5)

 

1. Symplast is associated with :

1. Plasmodesmata b. Plasma membrane c. Xylem          d. Phloem

 

1. Which one of the following is not easily absorbed by plants?

1. Nitrogen b. Potassium c. Calcium       d. Iron

 

1. Oxygen evolved during photosynthesis is derived from

1. Carbon di oxide b. Starch c. Water                       d. ATP

 

1. Legumes transport nitrogen primarily in the form of
   1. Aspargine        b. Allantoin     c. Glutamate                d. Ornithine

 

1. Phytohormone used in fruit ripening is

1. Auxin b. Cytokinin c. Gibberellic acid       d. Ethylene

 

 

II  State whether the following statements are true or false.              (5 x 1 = 5)

 

1. Movement of water is by cohesion and adhesion.
2. UV-visible spectrophotometer is used to detect micro nutrients.
3. CAM plants belong to C₄ type.
4. Glycolysis takes place in mitochondria.
5. Biologically active form of phytochrome is Pr.

 

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

 

1. Ratio of turgid weight with fresh and dry weight is known as ————-.
2. Die Back disease is caused due to the deficiency of ————-.
3. The rate of respiration equals to the rate of photosynthesis which is termed as —-.
4. Prosthetic group for nitrate reductase is —————-.
5. Hormone used to break the seed dormancy is ————-.

 

IV Answer the following each within 50 words.                               (5 x 1 = 5)

 

1. List any 2 applications of Laws of Thermodymaics.
2. Comment on antiport and symport.
3. What is CO₂ burst mechanism?
4. Expand GDH and GOGAT.
5. What is Richmond Lang effect?

 

Part – B

 

Answer any FIVE of the following, each not exceeding 350 words.                            (5 x 8 = 40)

 

1. Compare the Munch Mass flow hypothesis with solute transport in plants.
2. Describe the theory of photosynthesis for stomatal movements.
3. Tabulate the roles and deficiency symptoms of macronutrients.
4. Distinguish between cyclic and non-cyclic photophosphorylation with illustrations.
5. Explain trans and reductive amination reactions.
6. Give an account of glucose oxidation till pyruvate formation.
7. Describe the functions of auxins in plants.
8. With suitable illustrations and examples, write notes on physiology of flowering.

 

Part – C

 

Answer the following, each not exceeding 1500 words. Draw diagrams wherever necessary.                                                                                                                                  (2 x 20 = 40)

 

1. (a) Explicate the active mineral uptake mechanism with suitable theories.

Or

(b) Illustrate and explain CO₂ fixation process in C₃ plants.

 

1. (a) Describe the components of nitrogenase. Add note on its activity.

Or

(b) Discuss the effects of drought on crop plants.

 

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