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PEP carboxylase does not bind O2. This property makes the C4 pathway

  • (a) slower than the C3 pathway in bright light Your answer
  • (b) efficient at fixing CO2 even when CO2 is low Correct
  • (c) unable to work under high light intensity Your answer
  • (d) dependent on photorespiration for its CO2 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

PEPcase does not bind O2, so it can fix CO2 efficiently even when CO2 is low, without any loss to photorespiration.

Why the other options are wrong

  • (a) · your answer C4 plants are faster, not slower, in bright light.
  • (c) · your answer C4 plants work well under high light intensity.
  • (d) · your answer C4 plants avoid photorespiration.
NCERT point: This is why the C4 pathway can concentrate CO2 for RuBisCO.
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