Which of the following is a proteinaceous and water soluble photosynthetic pigment ?

Options

A. Chlorophyll
B. Xanthophyll
C. Phycocyanin
D. Anthocyanin

Answer

To determine which of the following is a proteinaceous and water-soluble photosynthetic pigment, we will evaluate each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options for pigments: chlorophyll, xanthophyll, phycocyanin, and anthocyanin.

2. **Evaluate Chlorophyll**:
- Chlorophyll is a well-known photosynthetic pigment.
- It is **insoluble in water** and typically found in organic solvents like ethanol.
- **Conclusion**: Chlorophyll does not meet the criteria of being water-soluble.

3. **Evaluate Xanthophyll**:
- Xanthophyll is another type of pigment found in leaves.
- Similar to chlorophyll, it is also **insoluble in water**.
- **Conclusion**: Xanthophyll does not meet the criteria of being water-soluble.

4. **Evaluate Phycocyanin**:
- Phycocyanin is a pigment that is indeed **water-soluble**.
- However, it is not classified as a proteinaceous pigment.
- **Conclusion**: Phycocyanin does not meet the criteria of being proteinaceous.

5. **Evaluate Anthocyanin**:
- Anthocyanin is a pigment known for its vibrant colors in plants.
- It is both **water-soluble** and can be considered **proteinaceous**.
- **Conclusion**: Anthocyanin meets both criteria of being proteinaceous and water-soluble.

6. **Final Answer**: Based on the evaluations, the correct answer is **anthocyanin**.