The electron flow from PS-II to NADP via ETS and PS-I follows

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Downhill $\to$ Uphill $\to$ Uphill $\to$ Downhill

Uphill $\to$ Downhill $\to$ Uphill $\to$ Downhill

Uphill $\to$ Downhill $\to$ Downhill $\to$ Uphill

Downhill $\to$ Uphill $\to$ Downhill $\to$ Uphill

answer is A.

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Detailed Solution

Electrons from PS -II are transported uphill to the electron acceptor. Again they are transported downhill through electron carriers. Again from PS – I they are moved uphill to an electron acceptor. Later these electrons are moved down hill to NADP+.

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