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Which statement about C4 plants with Kranz anatomy is FALSE?

  • (a) Mesophyll cells carry out the Calvin cycle using RuBisCO. Correct
  • (b) These plants show higher photosynthetic rates than C3 plants at high temperature. Your answer
  • (c) Maize, sorghum and sugarcane show this anatomy. Your answer
  • (d) Bundle sheath cells have many large chloroplasts. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Statement (a) is false: the mesophyll cells of C4 plants lack RuBisCO, so the Calvin cycle runs in the bundle sheath cells, not the mesophyll. The other statements are true.

Why the other options are wrong

  • (b) · your answer True: C4 plants photosynthesise faster at high temperatures.
  • (c) · your answer True: maize, sorghum and sugarcane have Kranz anatomy.
  • (d) · your answer True: bundle sheath cells have many large chloroplasts.
NCERT point: C4 mesophyll: PEPcase; bundle sheath: RuBisCO and Calvin cycle.
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