Rhodophyta are commonly called red algae because of the predominance of the

Options

A. red pigment,r-phycoerythrin in their body
B. red pigment,c-phycoerythrin in their body
C. red pigment,r-phycocyanin in their body
D. red pigment,c-phycocyanin in their body

Answer

**Step-by-Step Solution:**

1. **Understanding Rhodophyta**: Rhodophyta, commonly known as red algae, are a group of algae characterized by their red color.

2. **Identifying the Pigments**: The red color in Rhodophyta is primarily due to the presence of specific pigments. The main pigment responsible for this coloration is phycoerythrin.

3. **Differentiating Pigments**: While there are other pigments present in red algae, such as chlorophyll A and D, and other accessory pigments, phycoerythrin is the predominant pigment that gives the algae their red hue.

4. **Conclusion**: Therefore, the reason Rhodophyta are commonly called red algae is due to the predominance of the red pigment phycoerythrin in their body.

**Final Answer**: Rhodophyta are commonly called red algae because of the predominance of the red pigment phycoerythrin in their body.

---