Question

When the both pigment systems are involved simultaneously in electron transport system then path of electron become Z−shape. This shape is due to :-

• A. First electron acceptor is quinone
• B. Chlorophyll − a is universal pigment
• C. Spiting of water
• D. Electron carriers are placed in order of redox potential

Answer 1

The correct option is D Electron carriers are placed in order of redox potential

The whole scheme of transfer of electrons, starting from the $\text{PS II}$, uphill to the accepter, down the electron transport chain to PS I, excitation of electrons transfer to another accepter, and finally downhill to ${\text{NADP}}^{+}$ causing it to be reduced to ${\text{NADPH+ H}}^{+}$ is called the $\text{Z}$ scheme due to its characteristic shape. This shape is formed when all the carriers are placed in a sequence on a redox potential scale.
Hence, when the both pigment systems are involved simultaneously in electron transport system then path of electron become $\text{Z−}$shape this shape is due to electron carriers are placed in order of redox potential.