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Which of the following would reduce photorespiration in a C3 plant?

  • (a) raising the O2 level around the leaf Your answer
  • (b) raising the leaf temperature to 40°C Your answer
  • (c) closing the stomata in bright light Your answer
  • (d) raising the CO2 level around the leaf Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Raising CO2 around the leaf favours the carboxylase activity of RuBisCO, so photorespiration is reduced.

Why the other options are wrong

  • (a) · your answer More O2 increases photorespiration.
  • (b) · your answer High temperature tends to increase photorespiration in C3 plants.
  • (c) · your answer Closing stomata lowers internal CO2, which increases photorespiration.
NCERT point: C4 plants achieve this internally.
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Practise Photosynthesis in Higher Plants
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