Cyclic Photophosphorylation produces

Options

A. ATP
B. ATP + NADPH
C. NADPH
D. ATP, NADPH & `O_2`

Answer

**Step-by-Step Solution:**

1. **Understanding Cyclic Photophosphorylation**:
- Cyclic photophosphorylation is a process that occurs in the light-dependent reactions of photosynthesis, primarily involving Photosystem I (PSI).
- The main purpose of this process is to generate ATP, which is essential for the energy needs of the plant.

2. **Role of Photosystem I**:
- In cyclic photophosphorylation, light photons are absorbed by chlorophyll a in Photosystem I (P700).
- This absorption of light energy excites electrons, which are then emitted from the chlorophyll.

3. **Electron Transport Chain**:
- The excited electrons move through a series of proteins in the electron transport chain, including ferredoxin and cytochromes (cytochrome b6 and cytochrome f).
- As the electrons move through these proteins, they release energy.

4. **ATP Formation**:
- The energy released during the electron transport is used to convert ADP (adenosine diphosphate) and inorganic phosphate (Pi) into ATP (adenosine triphosphate).
- This process occurs twice during cyclic photophosphorylation, resulting in the production of two ATP molecules.

5. **End Products**:
- The end products of cyclic photophosphorylation are solely ATP. Unlike non-cyclic photophosphorylation, cyclic photophosphorylation does not produce NADPH or oxygen.

6. **Conclusion**:
- Therefore, the final answer to the question "Cyclic Photophosphorylation produces" is ATP.

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