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61.

Describe very briefly the contribution of the following scientists :

(1) Jan Ingcnhousz

(2) C.B. Van Niel

(3) Joseph Priestly

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62.

What is photosystem ? Which is the pigment that acts as reaction centre ? Describe the interaction of photosystem I and photosystem II.

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63. What led to the evolution of C₄ plants or C₄ pathway of photosynthesis ? Describe in detail.

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64. Describe Crasslacean acid metabolism.

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65.

Name the pentose phosphatew which is a CO₂ acceptor in the dark reaction of photosynthesis ?

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66.

Give comparison between the following :

(b) Cyclic and non-cyclic photophosphorylation

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67. All life on earth is bottled sun energy, justify.

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68. In which form the water plants absorb carbon through their general body surface ?

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69. Who proved that green plants produc oxygen by photosynthesis?

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70. Name the parts of chlorophyll.

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