In photosynthetic bacteria, reaction centre and reducing agent are _______ and _______ respectively :-

Options

A. `P_(700)` and `NADPH_(2)`
B. `P_(700)` and `NADH_(2)`
C. `P_(890)` and `NADPH_(2)`
D. `B_(890)` and `NADH_(2)`

Answer

To answer the question regarding the reaction center and reducing agent in photosynthetic bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthetic Bacteria**:
- Photosynthetic bacteria are autotrophic organisms that can perform photosynthesis. Unlike plants, they do not require water as a source of electrons and instead utilize other compounds.

2. **Identifying the Type of Photosynthesis**:
- Photosynthetic bacteria typically engage in anoxygenic photosynthesis, which means they do not produce oxygen as a byproduct. Instead, they use substances like hydrogen sulfide (H2S) as electron donors.

3. **Determining the Reaction Center**:
- The reaction center in photosynthetic bacteria is a specific pigment that absorbs light energy. For many photosynthetic bacteria, this reaction center is known as P890, which absorbs light at a wavelength of 890 nm.

4. **Identifying the Reducing Agent**:
- The reducing agent in photosynthetic bacteria is typically NADPH2. This compound acts as an electron carrier, facilitating the reduction reactions necessary for the synthesis of organic molecules during photosynthesis.

5. **Final Answer**:
- Therefore, in photosynthetic bacteria, the reaction center is **P890** and the reducing agent is **NADPH2**.

### Summary:
- Reaction Center: **P890**
- Reducing Agent: **NADPH2**