Q.

Which of the following electron transport is exclusively downhill?

Moderate

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By Expert Faculty of Sri Chaitanya

P680 → Pheophytin

P700 → NADP+

Pheophytin → P700

P700 → PS II

answer is 3.

(Detailed Solution Below)

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Detailed Solution

Electrons from pheophytin move to plastoquinone then to Cyt b6/ f and finally to P700 via plastocyanin.During this journey, electrons continuously loose energy. Therefore, electron transport from pheophytin to P700 is exclusively downhill.

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