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41. Why does rate of photosynthesis in plants growing under the forest canopy show marked decrease ?

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42. What is the abvantage of having more than one pigment molecule in a photocentre ?

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43. Describe about non-cyclic photophos-phorylation.

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44. Write a note on phycobilins.

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C₃ cycle is also called Calvin cycle. The first stable compound after the fixation CO₂ is a 3-carbon compound.

Calvin cycle of photosynthesis

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46. What are the steps common to C₃ and C₄ cycle ?

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47.

What is Kranz anatomy?

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48. Are the enzymes, that catalyze the dark reactions of carbon fixation, located inside or outside the thylakoids ?

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49. Write a note on action and absorption spectrum.

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50. What does the Blackmann’s law of limiting factor state.

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