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A plant leaf shows a ring of large cells with many chloroplasts around each vascular bundle, and its mesophyll cells have no RuBisCO. Which of the following can you conclude about this plant?

  • (a) Its first stable product is 3-PGA. Your answer
  • (b) It fixes CO2 first with PEPcase. Correct
  • (c) It cannot make starch. Your answer
  • (d) It shows high photorespiration. Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Kranz anatomy and mesophyll cells without RuBisCO show that this is a C4 plant, so it fixes CO2 first with PEPcase.

Why the other options are wrong

  • (a) · your answer The first product of a C4 plant is OAA, not 3-PGA.
  • (c) · your answer C4 plants make sugars and starch through the Calvin cycle.
  • (d) · your answer C4 plants show little or no photorespiration.
NCERT point: Kranz anatomy is a reliable sign of a C4 plant.
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