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Photorespiration is favoured by

  • (a) high temperature and low O2 Your answer
  • (b) high CO2 and low O2 Your answer
  • (c) high O2 and low CO2 Correct
  • (d) high humidity and temperature Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Photorespiration increases when the O2 concentration is high and CO2 is low, because O2 then competes with CO2 for RuBisCO.

Why the other options are wrong

  • (a) · your answer Low O2 reduces photorespiration, even at high temperature.
  • (b) · your answer High CO2 and low O2 favour carboxylation, so photorespiration falls.
  • (d) · your answer Humidity is not the controlling factor; the O2:CO2 ratio is.
NCERT point: RuBisCO binds CO2 more readily, but at a high O2:CO2 ratio it binds O2.
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