Cyclic photophosphorylation results in the formation of

Options

A. ATP, NADPH and `O_(2)`
B. ATP
C. NADPH
D. ATP and NADPH

Answer

### Step-by-Step Solution:

1. **Understanding Cyclic Photophosphorylation**:
- Cyclic photophosphorylation is a process that occurs in the light-dependent reactions of photosynthesis, specifically involving Photosystem I (PSI).

2. **Activation of Photosystem I**:
- In cyclic photophosphorylation, only Photosystem I is activated. This means that the light energy is absorbed by PSI, which excites electrons.

3. **Electron Transport**:
- The excited electrons from PSI are transferred through a series of proteins in the electron transport chain. However, instead of being transferred to NADP+ (as in non-cyclic photophosphorylation), the electrons are cycled back to PSI.

4. **Formation of ATP**:
- As the electrons move through the electron transport chain, they release energy. This energy is used to pump protons (H+) into the thylakoid lumen, creating a proton gradient. When protons flow back into the stroma through ATP synthase, ATP is produced.

5. **Conclusion**:
- The end product of cyclic photophosphorylation is the formation of ATP. Unlike non-cyclic photophosphorylation, which produces both ATP and NADPH, cyclic photophosphorylation only results in ATP formation.

### Final Answer:
Cyclic photophosphorylation results in the formation of ATP.

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