Which pigments is not found in red algae?

Options

A. Chlorophyll-a
B. Phycocyanin
C. Chlorophyll-b
D. Phycoerythrin

Answer

To determine which pigment is not found in red algae, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Class of Algae**:
- Red algae belong to the class Rhodophyceae.

2. **List the Known Pigments in Red Algae**:
- Red algae primarily contain the following pigments:
- **Chlorophyll a**: This is a common pigment found in many types of algae and plants.
- **Chlorophyll d**: This is also present in some red algae.
- **Phycoerythrin**: This pigment is responsible for the red color of red algae.

3. **Examine the Options**:
- The question provides several options for pigments. We need to identify which one is not found in red algae.
- The options include:
- **Chlorophyll a**: Found in red algae.
- **Chlorophyll b**: Not found in red algae.
- **Phycocyanin**: Primarily found in cyanobacteria (blue-green algae) but can also be present in some red algae.
- **Phycoerythrin**: Found in red algae.

4. **Conclusion**:
- Among the pigments listed, **Chlorophyll b** is the pigment that is not found in red algae.

### Final Answer:
**Chlorophyll b is not found in red algae.**

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