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Photorespiration is favoured by conditions that

  • (a) raise CO2 and lower O2 around RuBisCO Your answer
  • (b) raise both O2 and CO2 equally Your answer
  • (c) lower both O2 and CO2 Your answer
  • (d) raise O2 and lower CO2 around RuBisCO Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Photorespiration is favoured when O2 is high and CO2 is low around RuBisCO.

Why the other options are wrong

  • (a) · your answer High CO2 and low O2 favour carboxylation.
  • (b) · your answer Raising both equally does not shift RuBisCO towards O2.
  • (c) · your answer The ratio matters, not lowering both.
NCERT point: C4 plants raise CO2 around RuBisCO to prevent photorespiration.
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