Tuesday, May 29, 2007



Q1. What is the structural difference between Chl.a & Chl.b?

Q2. Where are the pigments forming the photo system located in the chloroplast?

Q3. Mention two conditions under which only PS-1 works.

Q4. Photorespiration posses a threat to plants, yet it occurs in angiosperms why?

Q5. How does the enzyme Rubisco act as carboxylase and oxygenase respectively?

Q6. Specify how C4 photosynthetic pathway increases CO2 concentration in bundle sheath cells of sugarcane?

Q7. What would happen to the rate of photosynthesis in C3 plants, if the CO2 concentration level almost doubles from its present level in the atmosphere?

Q8. How many molecules of ATP are required to produce one molecule of glucose in C4 plants? Give reasons.

Q9. Give the full form of Rubisco. Where is it present in C4 plants?

Q10. What is the significance of photolysis of water in photophosphorylation? What happens to each product of the process?

Q13.Two groups (A and B) of bean plants of similar size and same leaf were placed in identical conditions. Group A was exposed to light of wavelength 400-450 nm and Group B to light of wavelength of 500-550nm. Compare the photosynthetic rate of the two groups giving reason.

Q14.What is the law of limiting factor? How would the rate of photosynthesis be affected if the soil water becomes limiting? Explain

Q15.When and why does photorespiration take place in plants? How does this process result in a loss to the plants?

Q16 Why does the rate of photosynthesis decreases at higher light intensities? What plays a protective role in such situations?

Q17. Draw a schematic diagram of C4cycle.

Q18Where in the chloroplast does non- cyclic photophosphorylation take place? Draw schematic diagram and answer the following questions:

How does PSII regain its electrons?
Name the primary acceptor of electron of PSII in plants.
Name the enzyme which helps in the reduction of NADP.
What are antennae molecules?

Q19.Explain the mechanism of photorespiration with the help of schematic diagram. Name the cell organelles involved in the process. In what way does it loss to C3 plants?

No comments: