Select the wrong statement :

Options

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

Explanation

To solve the question "Select the wrong statement," we will analyze each of the provided statements regarding gametes in different organisms.

### Step-by-Step Solution:

1. **Statement 1: Isogametes are similar in structure, function, and behavior.**
- Isogametes are indeed similar in structure, function, and behavior. They are typically found in organisms like certain algae (e.g., Chlamydomonas, Eulothrix). This statement is **correct**.

2. **Statement 2: Anisogametes differ either in structure, function, and behavior.**
- Anisogametes are characterized by the presence of two different types of gametes, one being larger and non-motile (female) and the other being smaller and motile (male). This statement is also **correct**.

3. **Statement 3: In oomycetes, the female gamete is smaller and motile while the male gamete is larger and non-motile.**
- This statement is **incorrect**. In oomycetes, the female gamete is actually larger and non-motile, while the male gamete is smaller and motile. Therefore, this statement is the wrong one.

4. **Statement 4: Chlamydomonas exhibits both isogamy and anisogamy, and Fucus shows oogamy.**
- Chlamydomonas can reproduce through both isogamy (similar gametes) and anisogamy (different gametes), while Fucus does exhibit oogamy (fusion of a non-motile egg with a motile sperm). This statement is **correct**.

### Conclusion:
The wrong statement is: **In oomycetes, the female gamete is smaller and motile while the male gamete is larger and non-motile.**