Select the incorrect statement.

Options

A. Anlsogametes differ elther in structure, function or behaviour
B. in oomycetes, female gamete is smaller and motile, while male gamete is large and non – motlle
C. Chlamydomonas exhibits both isogamy and anisogamy and fucus shows oogamy
D. isogamets are similar in structure, function and behalour

Answer

To solve the question "Select the incorrect statement," we will analyze the provided statements regarding algae and their modes of reproduction. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Types of Sexual Reproduction in Algae
- Algae can reproduce sexually, and there are three main types of sexual reproduction:
1. **Isogamy**: Fusion of gametes that are similar in size and structure (isogametes).
2. **Anisogamy**: Fusion of gametes that are different in size and structure (anisogametes).
3. **Oogamy**: Involves a large, non-motile female gamete and a small, motile male gamete.

### Step 2: Analyze Each Statement
- **Statement 1**: Describes isogamy correctly.
- **Statement 2**: Claims that in anisogamy, the gametes are similar in size, which is incorrect. Anisogamy involves gametes that are different in size.
- **Statement 3**: Describes oogamy correctly, stating that the female gamete is large and non-motile while the male gamete is small and motile.
- **Statement 4**: States that climatomonasic algae can show both isogamy and anisogamy, which is correct.

### Step 3: Identify the Incorrect Statement
- The incorrect statement is **Statement 2**, which incorrectly describes anisogamy as having similar-sized gametes.

### Conclusion
The incorrect statement is the second one, which misrepresents the characteristics of anisogamy.

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