Question

In light reaction, plastoquinone facilitates the transfer of electrons from

• A. PS-I to $NAD{P}^{+}$
• B. PS-I to ATP synthase
• C. PS-II to $Cyt{b}_6$f complex
• D. $Cyt{b}_6$ complex to PS-I

Answer 1

The correct option is C PS-II to $Cyt{b}_6$f complex

In non-cyclic photophosphorylation, the electrons from PS-II are transferred to plastoquinone (PQ) which additionally accepts two more hydrogen ions to form $PQ{H}_2$. $PQ{H}_2$ formed then traverses the thylakoid membrane and transfers the electrons to $Cyt{b}_6$f complex along with liberating the hydrogen ions in the lumen.