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The thick walls of bundle sheath cells in C4 plants help to

  • (a) transport sugars faster to the phloem Your answer
  • (b) keep the released CO2 from diffusing out Correct
  • (c) store water during dry periods Your answer
  • (d) absorb more light for the light reactions Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

The thick walls of bundle sheath cells are impervious to gaseous exchange, so the CO2 released inside them does not diffuse out and stays concentrated around RuBisCO.

Why the other options are wrong

  • (a) · your answer The walls are not for faster sugar transport.
  • (c) · your answer They are not for storing water.
  • (d) · your answer Walls do not absorb light.
NCERT point: A high CO2 level at RuBisCO prevents photorespiration.
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