Which of the following character is wrong regarding brown algae ?

Options

A. Presence of chlorophyll 'a' and 'b'
B. They remain attached to the surface by holdfast
C. presence of chlorophyll 'a' and 'c'
D. presence of fucoxanthin which gives brown colour

Answer

To solve the question regarding the wrong character of brown algae, we need to analyze each statement provided:

1. **Presence of chlorophyll A and B**:
- Brown algae do not contain chlorophyll B. They primarily contain chlorophyll A and chlorophyll C. Therefore, this statement is incorrect.

2. **They remain attached to the surface by holdfast**:
- Brown algae have a structure called a holdfast, which anchors them to the substrate or surface they grow on. This statement is correct.

3. **Presence of chlorophyll A and C**:
- Brown algae indeed contain chlorophyll A and chlorophyll C. This statement is correct.

4. **Presence of phycocyanin which gives brown color**:
- Brown algae contain a pigment called fucoxanthin, which gives them their characteristic brown color, not phycocyanin. Phycocyanin is found in cyanobacteria and red algae. Therefore, this statement is incorrect.

Now, let's summarize the findings:
- The first statement is wrong because brown algae do not contain chlorophyll B.
- The second statement is correct as brown algae do have holdfasts.
- The third statement is correct as brown algae contain chlorophyll A and C.
- The fourth statement is incorrect because it mentions phycocyanin instead of fucoxanthin.

Thus, the wrong character regarding brown algae is the first statement.

### Final Answer:
The wrong character regarding brown algae is the presence of chlorophyll A and B (Statement 1).