The two light reactions,when absorbing light, | vedclass

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Question

(A) In the light-dependent reactions of photosynthesis,the two photosystems ($PSII$ and $PSI$) work in tandem to drive the flow of electrons. When $PS

Vedclass · Accepted Answer

$-1.1 \ V$ to $+0.8 \ V$

Vedclass · Answer

(A) In the light-dependent reactions of photosynthesis,the two photosystems ($PSII$ and $PSI$) work in tandem to drive the flow of electrons. When $PSII$ absorbs light,it becomes excited and loses electrons,which are then passed through an electron transport chain. The redox potential of the primary electron acceptor of $PSII$ is approximately $-0.8 \ V$ to $-1.1 \ V$,while the final electron donor,water,has a redox potential of approximately $+0.8 \ V$. Therefore,the light energy is used to drive electrons against an electrochemical gradient from a potential of approximately $-1.1 \ V$ to $+0.8 \ V$.

The two light reactions,when absorbing light,drive the flow of electrons against an electrochemical gradient from

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