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In light reaction, plastoquinone facilitates the transfer of electrons from:
A
$Cytb_6f$ complex to PS-I
B
PS-I to $NADP^+$
C
PS-I to ATP synthase
D
PS-II to $Cytb_6f$ complex
Detailed Solution
After excitation, electrons pass from PS II ($P_{680}$) to the primary electron acceptor (pheophytin) and then to plastoquinone.
Plastoquinone (PQ) in turn transfers electrons to the cytochrome $b_6f$ complex.
So plastoquinone facilitates electron transfer from PS II to the Cyt $b_6f$ complex.