alleryCyclic photophosphorylation involves
ANeither PS I nor PS II in dark
BOnly PS I producing ATP without NADPH
COnly PS II producing NADPH without ATP
DBoth PS I and PS II producing O2 only
Answer & Solution
Correct answer: B. Only PS I producing ATP without NADPH
**Cyclic flow uses only PS I:** excited electrons leave P700, traverse the ETS, and return to P700, pumping H+ to drive ATP synthesis.
No NADPH is made; no water is split; no O2 is evolved.
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