This provides brown colour to algae

Options

A. Chlorophyll a
B. Phycocyanin
C. Fucoxanthin
D. Chlorophyl b.

Answer

To solve the question "This provides brown colour to algae," we will analyze the options provided and identify which pigment is responsible for the brown coloration in algae.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Chlorophyll A
- B) Phycocyanin
- C) Fucoxanthin
- D) Chlorophyll B

2. **Analyze Chlorophyll A and B**:
- Chlorophyll A and Chlorophyll B are known pigments that primarily provide green coloration to plants and algae. They are essential for photosynthesis but do not contribute to brown coloration.
- **Conclusion**: Both options A and D can be ruled out as they do not provide brown color.

3. **Analyze Phycocyanin**:
- Phycocyanin is a pigment found in red algae (Rhodophyta) and is responsible for the red color. It does not contribute to the brown coloration in algae.
- **Conclusion**: Option B can also be ruled out.

4. **Analyze Fucoxanthin**:
- Fucoxanthin is a pigment that is specifically associated with brown algae (Phaeophyceae). It is responsible for the brown color observed in these algae.
- **Conclusion**: Option C, Fucoxanthin, is the correct answer as it provides the brown color to algae.

5. **Final Answer**: The pigment that provides brown color to algae is **Fucoxanthin** (Option C).