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Question

Biology Question on Photosynthesis in higher plants

Which one is involved in ZZ-scheme of photosynthesis?

A

PSIPS I

B

PSIIPS II

C

ee^{-} carriers

D

All of these

Answer

All of these

Explanation

Solution

In non cyclic photophosphorylation, the whole scheme of transfer of electrons, starting from the PSIIPS II, uphill to the acceptor, down the electron transport chain to PSIPS I, excitation of electrons, transfer to another acceptor, and finally down hill to NADP+NADP^{+} causing it to be reduced to NADPH+H+NADPH + H^{+} is called as the ZZ scheme, due to its characteristic shape. This shape is formed when all the carriers are placed in a sequence on the redox potential scale.