Select the wrong statement

Options

A. Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy
B. Isogametes are similar in structure, function and behaviour
C. Anisogametes differ either in structure, function or behaviour
D. In Oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

Explanation

To determine the wrong statement regarding gametes in the context of sexual reproduction, we need to analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Gametes**:
- In sexual reproduction, there are two types of gametes: male and female.
- Gametes can be classified based on their structure and characteristics.

2. **Analyzing the Statements**:
- **Statement 1**: "Clamido Monas exhibits both iso-gametes and iso-gametes in Fucus shows U-gametes."
- This statement suggests that Clamido Monas has iso-gametes and Fucus has U-gametes. This is correct as Clamido Monas has iso-gametes (similar in structure) and Fucus has U-gametes (different in structure).

- **Statement 2**: "Iso-gametes are similar in structure, function, and behaviour."
- This statement is correct. Iso-gametes are indeed similar in structure and function.

- **Statement 3**: "Iso-gametes differ either in structure, function, or behaviour."
- This statement is incorrect. Iso-gametes, by definition, do not differ in structure, function, or behaviour; they are similar.

- **Statement 4**: "In U-gametes, female gamete is smaller and more motile while male gamete is larger and non-motile."
- This statement is incorrect. In U-gametes, the female gamete is typically larger and non-motile, while the male gamete is smaller and motile.

3. **Identifying the Wrong Statement**:
- The third statement is the wrong one because it incorrectly describes iso-gametes as differing in structure, function, or behaviour, which contradicts their definition.

### Conclusion:
The wrong statement is **Statement 3**: "Iso-gametes differ either in structure, function, or behaviour."

---