LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc.
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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)
- Symplast is associated with :
- Plasmodesmata b. Plasma membrane c. Xylem d. Phloem
- Which one of the following is not easily absorbed by plants?
- Nitrogen b. Potassium c. Calcium d. Iron
- Oxygen evolved during photosynthesis is derived from
- Carbon di oxide b. Starch c. Water d. ATP
- Legumes transport nitrogen primarily in the form of
- Aspargine b. Allantoin c. Glutamate d. Ornithine
- Phytohormone used in fruit ripening is
- Auxin b. Cytokinin c. Gibberellic acid d. Ethylene
II State whether the following statements are true or false. (5 x 1 = 5)
- Movement of water is by cohesion and adhesion.
- UV-visible spectrophotometer is used to detect micro nutrients.
- CAM plants belong to C4 type.
- Glycolysis takes place in mitochondria.
- Biologically active form of phytochrome is Pr.
III Complete the following. (5 x 1 = 5)
- Ratio of turgid weight with fresh and dry weight is known as ————-.
- Die Back disease is caused due to the deficiency of ————-.
- The rate of respiration equals to the rate of photosynthesis which is termed as —-.
- Prosthetic group for nitrate reductase is —————-.
- Hormone used to break the seed dormancy is ————-.
IV Answer the following each within 50 words. (5 x 1 = 5)
- List any 2 applications of Laws of Thermodymaics.
- Comment on antiport and symport.
- What is CO2 burst mechanism?
- Expand GDH and GOGAT.
- What is Richmond Lang effect?
Part – B
Answer any FIVE of the following, each not exceeding 350 words. (5 x 8 = 40)
- Compare the Munch Mass flow hypothesis with solute transport in plants.
- Describe the theory of photosynthesis for stomatal movements.
- Tabulate the roles and deficiency symptoms of macronutrients.
- Distinguish between cyclic and non-cyclic photophosphorylation with illustrations.
- Explain trans and reductive amination reactions.
- Give an account of glucose oxidation till pyruvate formation.
- Describe the functions of auxins in plants.
- 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)
- (a) Explicate the active mineral uptake mechanism with suitable theories.
Or
(b) Illustrate and explain CO2 fixation process in C3 plants.
- (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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