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Question

The scheme of transfer of electrons starting from the PS II to the reduction of NADP+ is called 
  1. Z-scheme
  2. non-cyclic photo-phosphorylation
  3. cyclic photo-phosphorylation
  4. none of the above


Solution

The correct option is A Z-scheme
The whole scheme of transfer of electrons, starting from the PS II, uphill to an acceptor, down the electron transport chain to PS I, excitation of electrons at PS I, transfer to another acceptor, and finally downhill to NADP+, reducing it to NADPH + H+, is called the Z-scheme, due to its characteristic shape. This shape is formed when all the electron carriers are placed in a sequence on a redox potential scale.


Non-cyclic photo-phosphorylation: When both the photosystems work in coordination, first PS II and then the
PS I, a process called non-cyclic photo-phosphorylation occurs. The electrons are transferred to NADP+ in the Z-scheme, which results in the production of ATP molecules. The non-cyclic photophosphorylation process includes the transfer of electrons through the Z-scheme and ATP production.

Cyclic photo-phosphorylation: The electron is circulated within the photosystem when only PS I is operational and the phosphorylation (formation of ATP) occurs due to the cyclic flow of electrons.

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