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C4 plants show higher productivity than C3 plants mainly because they

  • (a) largely avoid photorespiration Correct
  • (b) have no Calvin cycle Your answer
  • (c) have more chloroplasts in the epidermis Your answer
  • (d) do not need light Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

C4 plants largely avoid photorespiration, so they lose less carbon and have higher productivity.

Why the other options are wrong

  • (b) · your answer C4 plants do have the Calvin cycle.
  • (c) · your answer Epidermal cells usually lack chloroplasts in all plants.
  • (d) · your answer C4 plants need light; they do best in high light.
NCERT point: C4 plants also use water and nitrogen more efficiently.
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