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The C4 pathway prevents photorespiration by

  • (a) raising CO2 at RuBisCO in the bundle sheath Correct
  • (b) removing RuBisCO from all cells of the leaf Your answer
  • (c) raising O2 in the bundle sheath cells Your answer
  • (d) keeping the stomata permanently closed Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

The C4 pathway raises the CO2 concentration around RuBisCO in the bundle sheath, so RuBisCO works as a carboxylase and photorespiration is prevented.

Why the other options are wrong

  • (b) · your answer C4 plants have RuBisCO in the bundle sheath.
  • (c) · your answer Raising O2 would increase photorespiration.
  • (d) · your answer Stomata must open to take in CO2.
NCERT point: This is a CO2-concentrating mechanism.
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