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During the light reaction, which of the following is common to cyclic and non-cyclic photophosphorylation?

  • (a) release of O2 Your answer
  • (b) formation of ATP Correct
  • (c) involvement of both PS I and PS II Your answer
  • (d) formation of NADPH Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Both cyclic and non-cyclic photophosphorylation make ATP. Only non-cyclic flow uses both photosystems, splits water to release O2 and makes NADPH.

Why the other options are wrong

  • (a) · your answer O2 is released only in non-cyclic flow, when PS II splits water.
  • (c) · your answer Cyclic flow uses PS I only.
  • (d) · your answer NADPH is made only in non-cyclic flow.
NCERT point: Non-cyclic: ATP + NADPH + O2. Cyclic: ATP only.
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