Phycoerythrin is the major pigment in:

Options

A. Red Algae
B. Blue green algae
C. green algae
D. brown algae

Answer

To determine where phycoerythrin is the major pigment, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the major pigment phycoerythrin and which type of algae it is associated with.

2. **Identify Types of Algae**: There are several classes of algae, including:
- Chlorophyceae (Green Algae)
- Rhodophyceae (Red Algae)
- Pheophyceae (Brown Algae)
- Cyanobacteria (Blue-Green Algae)

3. **Analyze Each Class for Pigments**:
- **Chlorophyceae (Green Algae)**: The main pigments are chlorophyll A and B. Phycoerythrin is not present here.
- **Rhodophyceae (Red Algae)**: This class contains chlorophyll A and D, and importantly, phycoerythrin, which gives red algae their characteristic color.
- **Pheophyceae (Brown Algae)**: The pigments here are chlorophyll A and C, along with fucoxanthin, which gives brown algae their color. Phycoerythrin is not found in this class.
- **Cyanobacteria (Blue-Green Algae)**: These are prokaryotic organisms that also contain chlorophyll but do not have phycoerythrin.

4. **Conclusion**: Based on the analysis, phycoerythrin is primarily found in the Rhodophyceae class, which consists of red algae.

5. **Final Answer**: Therefore, the correct answer is **Red Algae (Rhodophyceae)**.