Question

In Z-scheme of light reaction, the participating pigment systems is/are

• A. PS-I and PS-II
• B. PS-III
• C. carotenoid and xanthophyll
• D. PS-II

Answer 1

Answer: (A)

The $Z$-scheme of electron transport is non-cyclic photophosphorylation. It involves both $PS-I$ and $PS-II$. It is the scheme of transfer of electrons, starting from the $PS-II$, uphill to the acceptor, down the electron transport chain to $PS-I$, excitation of electrons, in the reaction centre of $PS-I$ transfer to another acceptor and finally downhill to $NAD{P}^{+}$reducing it to $NADPH+H^{+}$. This scheme of electron transfer is called $Z$-scheme due to its characteristic shape.