Which of the following plant pigments is water soluble?

Options

A. Chlorophyli
B. Carotene
C. Xanthophyll
D. Phycobilin

Answer

To determine which of the following plant pigments is water-soluble, we will analyze each option provided:

1. **Chlorophyll**:
- Chlorophyll is a green pigment essential for photosynthesis in plants.
- It is known to be fat-soluble, meaning it dissolves in fats and oils, not in water.

2. **Carotene**:
- Carotene is a pigment that gives carrots and other plants their orange color.
- Similar to chlorophyll, carotene is also fat-soluble and does not dissolve in water.

3. **Xanthophyll**:
- Xanthophyll is a yellow pigment found in many plants.
- Like the previous pigments, xanthophyll is fat-soluble and does not dissolve in water.

4. **Phycobilin**:
- Phycobilin is a pigment found in red algae and cyanobacteria, and it plays a role in photosynthesis.
- Unlike the other pigments mentioned, phycobilin is water-soluble, meaning it can dissolve in water.

Based on this analysis, the water-soluble pigment among the options is **phycobilin**.

### Final Answer:
**Phycobilin** is the water-soluble pigment.