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Carbon dioxide joins the photosynthetic pathway in the

  • (a) light reaction Your answer
  • (b) PS I Your answer
  • (c) PS II Your answer
  • (d) dark reaction Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

CO2 is used in the dark reaction (Calvin cycle), where RuBisCO fixes it with RuBP. The light reaction, PS I and PS II do not use CO2.

Why the other options are wrong

  • (a) · your answer The light reaction uses light and water; it does not fix CO2.
  • (b) · your answer PS I passes electrons to NADP+; it does not take in CO2.
  • (c) · your answer PS II splits water; it does not take in CO2.
NCERT point: CO2 fixation (carboxylation) is the first stage of the Calvin cycle.
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