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A CO2-concentrating mechanism around RuBisCO is found in

  • (a) plants without Kranz anatomy Your answer
  • (b) C4 plants Correct
  • (c) C3 plants Your answer
  • (d) all temperate plants Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

C4 plants have a mechanism that raises the CO2 concentration around RuBisCO: CO2 is fixed in the mesophyll and released inside the bundle sheath cells.

Why the other options are wrong

  • (a) · your answer Plants without Kranz anatomy (C3 plants) lack this mechanism.
  • (c) · your answer C3 plants fix CO2 directly with RuBisCO and do not concentrate it.
  • (d) · your answer Temperate plants are mostly C3; this mechanism is a C4 feature.
NCERT point: Because CO2 is high at RuBisCO, its oxygenase activity is suppressed.
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