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In which cells of a C4 leaf does RuBisCO act?

  • (a) both mesophyll and bundle sheath cells Your answer
  • (b) epidermal cells Your answer
  • (c) mesophyll cells Your answer
  • (d) bundle sheath cells Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

In C4 plants, RuBisCO is present only in the bundle sheath cells, where it fixes the CO2 released from the C4 acids.

Why the other options are wrong

  • (a) · your answer Mesophyll cells of C4 plants lack RuBisCO.
  • (b) · your answer Epidermal cells do not carry out carbon fixation.
  • (c) · your answer Mesophyll cells have PEPcase, not RuBisCO.
NCERT point: This division of enzymes is the basis of the C4 pathway.
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