Bacterial photosynthesis involves………

Options

A. PS I
B. PS II
C. Both PS I and PS II
D. None of them.

Answer

**Step-by-Step Solution:**

1. **Understanding Bacterial Photosynthesis**:
- Bacterial photosynthesis is a process where bacteria convert light energy into chemical energy. This process is different from that in plants.

2. **Types of Photophosphorylation**:
- There are two main types of photophosphorylation: cyclic and non-cyclic.
- Cyclic photophosphorylation involves only Photosystem I.
- Non-cyclic photophosphorylation involves both Photosystem I and Photosystem II.

3. **Bacterial Mechanism**:
- In bacterial photosynthesis, particularly in green sulfur bacteria, cyclic photophosphorylation occurs.
- Bacteria use hydrogen sulfide as an electron donor, which means they do not release oxygen during this process.

4. **Identifying the Correct Option**:
- The question asks which photosystem is involved in bacterial photosynthesis.
- Since bacterial photosynthesis primarily involves cyclic photophosphorylation, the correct answer is Photosystem I.

5. **Conclusion**:
- Therefore, the answer to the question "Bacterial photosynthesis involves…" is **Photosystem I**.