Non-cyclic photophosphorylation involves:

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(A) Non-cyclic photophosphorylation,also known as the $Z$-scheme,involves both photosystems $PS-II$ and $PS-I$ working in series. $1$. Electrons are r

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$PS-I$ and $PS-II$

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(A) Non-cyclic photophosphorylation,also known as the $Z$-scheme,involves both photosystems $PS-II$ and $PS-I$ working in series. $1$. Electrons are released from $PS-II$ upon excitation by light. $2$. These electrons pass through an electron transport chain to $PS-I$. $3$. $PS-I$ is also excited by light and transfers electrons to $NADP^+$ to form $NADPH$. $4$. Since the electrons lost by $PS-II$ are replaced by the photolysis of water,the flow of electrons is non-cyclic.

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