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(C) Cyclic photophosphorylation involves only Photosystem $I$ $(PSI)$.In this process,the excited electrons are cycled back to the reaction center $(P

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$ATP$

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(C) Cyclic photophosphorylation involves only Photosystem $I$ $(PSI)$.In this process,the excited electrons are cycled back to the reaction center $(P700)$ through an electron transport chain.As the electrons move through the electron transport system,energy is released which is used to pump protons across the membrane,creating a proton gradient.This gradient drives the synthesis of $ATP$ from $ADP$ and inorganic phosphate $(Pi)$ via $ATP$ synthase.Unlike non-cyclic photophosphorylation,cyclic photophosphorylation does not involve the photolysis of water (so no $O_2$ is released) and does not reduce $NADP^+$ to $NADPH$.

Cyclic photophosphorylation results in the formation of:

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