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In C4 plants, photorespiration does not occur mainly because

  • (a) they lack RuBisCO in all their cells Your answer
  • (b) they grow only in deep shade Your answer
  • (c) they keep CO2 high around RuBisCO Correct
  • (d) they lack mitochondria in leaf cells Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

C4 plants show no photorespiration because they keep CO2 high around RuBisCO in the bundle sheath.

Why the other options are wrong

  • (a) · your answer They do have RuBisCO, in the bundle sheath.
  • (b) · your answer C4 plants do best in high light.
  • (d) · your answer C4 leaf cells have mitochondria.
NCERT point: PEPcase in the mesophyll pumps CO2 into the bundle sheath.
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