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During cyclic photophosphoryltion, which...

During cyclic photophosphoryltion, which of following events does not occur

A

Electrons are transferred back to `P_(680)`

B

`NADP^(+)` is not available as an electron acceptor

C

NADPH will not be oxidised

D

electrons from photosystem I are not passed to NADP+

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Photophosphorylation**: - Photophosphorylation refers to the process of synthesizing ATP using light energy. It occurs in two forms: cyclic and non-cyclic photophosphorylation. 2. **Identifying the Types**: - Non-cyclic photophosphorylation involves both Photosystem I (PSI) and Photosystem II (PSII), leading to the production of ATP and NADPH. - Cyclic photophosphorylation, on the other hand, involves only Photosystem I. 3. **Function of Photosystem I**: - In cyclic photophosphorylation, the reaction center of Photosystem I is known as P700. This system absorbs light and facilitates the flow of electrons. 4. **Key Events in Cyclic Photophosphorylation**: - Only ATP is synthesized during cyclic photophosphorylation. - Electrons are cycled back to Photosystem I, which means they do not reduce NADP+ to form NADPH. - The absence of Photosystem II and NADP reductase enzyme is crucial, as these components are necessary for NADPH synthesis. 5. **Identifying the Incorrect Event**: - Since cyclic photophosphorylation does not produce NADPH, any statement suggesting that NADPH is produced or that PSII is involved would be incorrect. 6. **Conclusion**: - The event that does not occur during cyclic photophosphorylation is the synthesis of NADPH.
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