Select the wrong statement :

Options

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

Answer

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

### Step-by-Step Solution:

1. **Understand the Types of Gametes**:
- There are two main types of gametes: **isogametes** (similar in structure, function, and behavior) and **heterogametes** (different in structure, function, and behavior).
- Anisogamous organisms produce heterogametes, while isogamous organisms produce isogametes.

**Hint**: Recall the definitions of isogamy and anisogamy.

2. **Analyze the First Statement**:
- The first statement claims that anisogametes differ either in structure, function, or behavior. This is true because anisogametes are indeed different from each other.

**Hint**: Think about the characteristics of anisogametes.

3. **Analyze the Second Statement**:
- The second statement discusses Chlamydomonas and Fucus. It states that Chlamydomonas exhibits both isogamy and anisogamy, while Fucus shows oogamy. This is accurate; Chlamydomonas can reproduce both ways, and Fucus does exhibit oogamy.

**Hint**: Consider the reproductive strategies of these organisms.

4. **Analyze the Third Statement**:
- The third statement describes oogamy, stating that the female gamete is larger and immotile, while the male gamete is smaller and motile. This is correct as per the definition of oogamy.

**Hint**: Remember the characteristics of male and female gametes in oogamy.

5. **Identify the Incorrect Statement**:
- The video transcript indicates that the wrong statement is related to the description of Fucus and its gametes. The female gamete is described as smaller and motile, which is incorrect. The female gamete is actually larger and immotile.

**Hint**: Focus on the characteristics of the gametes in Fucus.

6. **Conclusion**:
- The wrong statement is the one that incorrectly describes the characteristics of the female and male gametes in Fucus. Therefore, the answer to the question is the statement that claims the female gamete is smaller and motile.

### Final Answer:
The wrong statement is that the female gamete in Fucus is smaller and motile.