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 about the reaction center and reducing agent in photosynthetic bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Photosynthesis in Bacteria**:
- Photosynthetic bacteria perform anoxygenic photosynthesis, which means they do not produce oxygen as a byproduct. Instead, they use other substances as electron donors.

2. **Identify the Reaction Center**:
- The reaction center in photosynthetic bacteria is responsible for capturing light energy. In this case, the specific reaction center is known as P890, which has an absorption maximum at a wavelength of 890 nanometers.

3. **Identify the Reducing Agent**:
- The reducing agent in photosynthetic bacteria is NADPH2. This molecule plays a crucial role in the transfer of electrons during the photosynthetic process, particularly in the Calvin cycle where it helps in the synthesis of glucose.

4. **Evaluate the Options**:
- The options given in the question are:
- P700 and NADPH2
- P700 and NADH2
- P890 and NADPH2
- P890 and NADH2
- From our understanding, P700 is associated with plants and algae, not with photosynthetic bacteria. Therefore, the correct pair must include P890 and NADPH2.

5. **Final Answer**:
- Thus, the correct answer is:
- Reaction center: **P890**
- Reducing agent: **NADPH2**

### Summary:
In photosynthetic bacteria, the reaction center is **P890** and the reducing agent is **NADPH2**.

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