Reaction centre of PS II is

Options

A. `P_700`
B. `P_680`
C. `chl_715`
D. `chl_685`

Answer

### Step-by-Step Solution:

1. **Understanding Photosystems**:
- Photosystems are the functional units of photosynthesis in plants. They are responsible for absorbing light energy and converting it into chemical energy.

2. **Identifying the Types of Photosystems**:
- There are two types of photosystems in plants: Photosystem I (PS I) and Photosystem II (PS II). Both are located in the thylakoid membranes of chloroplasts.

3. **Identifying the Reaction Centers**:
- Each photosystem has a specific reaction center that absorbs light at a particular wavelength.
- For Photosystem I, the reaction center is designated as P700, which absorbs light at a wavelength of 700 nanometers.
- For Photosystem II, the reaction center is designated as P680, which absorbs light at a wavelength of 680 nanometers.

4. **Answering the Question**:
- The question specifically asks for the reaction center of Photosystem II (PS II).
- Therefore, the reaction center of PS II is P680.

### Final Answer:
The reaction center of PS II is P680.

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