Photosynthetic bacteria have

Options

A. pigment system I
B. Pigment system II
C. both (a) and (b)
D. some other kind of pigments, `P_(890)`

Explanation

To solve the question "Photosynthetic bacteria have," we need to analyze the types of pigment systems present in photosynthetic bacteria compared to those in higher plants.

### Step-by-Step Solution:

1. **Understand Pigment Systems in Higher Plants**:
- Higher plants possess two main pigment systems known as Photosystem I (PSI) and Photosystem II (PSII).
- PSI has a reaction center known as P700, which absorbs light primarily at a wavelength of 700 nanometers.
- PSII has a reaction center known as P680, which absorbs light primarily at a wavelength of 680 nanometers.

2. **Identify Pigment Systems in Photosynthetic Bacteria**:
- Photosynthetic bacteria, such as purple and green bacteria, do not have the same pigment systems as higher plants.
- Instead, they have a unique pigment system that is sensitive to far-red light.

3. **Determine the Specific Pigment in Bacteria**:
- The specific pigment system in photosynthetic bacteria is associated with a reaction center known as P890.
- This means that photosynthetic bacteria utilize a different pigment system compared to the P700 and P680 found in higher plants.

4. **Select the Correct Answer**:
- Given the options provided:
1. Pigment system 1
2. Pigment system 2
3. Both A and B
4. Some other kind of pigment, P890
- The correct answer is option 4: "some other kind of pigment, P890."

### Final Answer:
Photosynthetic bacteria have "some other kind of pigment, P890."

---