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Photosynthesis in Higher Plants

Short Answer Type

51. How is C₄ pathway more energy expensive that C₃ ?

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52. Differentiate between Chlorophyll ‘a’ and Chlorophyll ‘b’ :

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53. Explain the affect of carbon dioxide on photosynthesis.

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Long Answer Type

54. Distinguish between photorespiration and respiration.

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Short Answer Type

55. What are heliophytes and sciophytes ?

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Long Answer Type

56. Differentiate between photosystem I and II.

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Short Answer Type

57. What is saturation point ?

Saturation point is the maximum intensity of light at which the rate of photosynthesis is maximum. Above this value of light intensity, rate of photosynthesis decreases.

Value : It is 60–70% for C₃ plants and about 200% of full sunlight for C₄ plants.

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Long Answer Type

58. Describe carbon reactions of the C₃pathway. Does this pathway also operate in C₄plants ?

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One Word Answers

59. O₂ evolved during photosynthesis is from ?

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Long Answer Type

60. What is photorespiration ? Describe the process in detail and link it with the Calvin Cycle.

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