In pigment system II, active chlorophyll is

Options

A. `P_(680)`
B. `P_(830)`
C. `P_(700)`
D. `P_(673)`

Answer

To answer the question "In pigment system II, active chlorophyll is:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question is about pigment system II, which is part of the photosynthetic process in plants. It is important to know that chlorophyll is a pigment involved in capturing light energy.

2. **Identify the Types of Chlorophyll**: There are different types of chlorophyll, each with a specific absorption peak. The question provides options: P680, P830, P700, and P673.

3. **Know the Function of Chlorophyll**: Chlorophyll absorbs light energy, which is crucial for photosynthesis. The energy captured by chlorophyll is used in the light-dependent reactions of photosynthesis.

4. **Determine the Active Chlorophyll in Pigment System II**: In pigment system II, the active chlorophyll is specifically known as P680. This chlorophyll absorbs light maximally at a wavelength of 680 nanometers.

5. **Conclude the Answer**: Based on the information about pigment system II and the specific absorption characteristics of chlorophyll, we conclude that the active chlorophyll in pigment system II is P680.

### Final Answer:
The active chlorophyll in pigment system II is **P680**.

---