Which of the following electron transport is exclusively downhill?
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a
P680 → Pheophytin
b
P700 → NADP+
c
Pheophytin → P700
d
P700 → PS II
answer is C.
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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.