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 determine which character is wrong regarding brown algae, we need to analyze the characteristics associated with them. Here’s a step-by-step solution:

### Step 1: Identify the Types of Chlorophyll in Brown Algae
Brown algae, classified under the class Pheophyceae, primarily contain chlorophyll A and chlorophyll C. They do not contain chlorophyll B, which is characteristic of green algae (Chlorophyceae).

**Hint:** Remember the specific types of chlorophyll associated with different classes of algae.

### Step 2: Examine the Attachment Mechanism
Brown algae are known to remain attached to surfaces through structures called holdfasts. This is a correct characteristic of brown algae.

**Hint:** Think about how different types of algae anchor themselves to surfaces in aquatic environments.

### Step 3: Check for the Presence of Fucosanthin
Fucosanthin is a pigment that gives brown algae their characteristic brown color. This statement is true for brown algae.

**Hint:** Recall the pigments that contribute to the coloration of algae and their significance.

### Step 4: Analyze the Stored Food
Brown algae store food in the form of mannitol and laminarin, which is another correct characteristic.

**Hint:** Consider how different algae store energy and the substances they use for storage.

### Step 5: Identify the Incorrect Statement
From the analysis:
- The presence of chlorophyll A and B is incorrect for brown algae (they have A and C).
- The attachment via holdfast is correct.
- The presence of chlorophyll A and C is correct.
- The presence of fucosanthin is correct.

Thus, the statement that is wrong regarding brown algae is the presence of chlorophyll A and B.

**Final Answer:** The wrong character regarding brown algae is the presence of chlorophyll A and B.

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