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NEETBotanyPhotosynthesis in Higher Plants

How many NADPH molecules are required for every CO2 molecule entering the Calvin cycle?

Options

  1. AOne
  2. BTwo
  3. CThree
  4. DFour

Correct answer

B. Two

Step-by-step solution

Regeneration of the CO2 acceptor molecule RuBP is crucial if the cycle is to continue uninterrupted. The regeneration steps require one ATP for phosphorylation to form RuBP. Hence for every CO2 molecule entering the Calvin cycle, 3 molecules of ATP and 2 of NADPH are required. It is probably to meet this difference in number of ATP and NADPH used in the dark react ion that the cyclic phosphorylation takes place.

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