Cyclic photophosphorylation produces

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

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$ATP$

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(C) Cyclic photophosphorylation involves only Photosystem $I$ $(PS-I)$.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 transport chain,the energy released is used to pump protons across the membrane,creating a proton gradient that drives the synthesis of $ATP$ 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 involve the reduction of $NADP^+$ to $NADPH$.Therefore,the only product of cyclic photophosphorylation is $ATP$.

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