Select the wrong statement regarding the sexual reproduction

Options

A. Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.
B. Isogemetes 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.

Answer

To solve the question of selecting the wrong statement regarding sexual reproduction, we will analyze the provided statements about different types of sexual reproduction in algae. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Types of Sexual Reproduction
- **Isogamy**: Involves gametes that are similar in structure, function, and behavior, referred to as homogametes or isogametes.
- **Anisogamy**: Involves gametes that are different in structure, function, and behavior, referred to as heterogametes.
- **Oogamy**: Involves a smaller, motile male gamete and a larger, stationary female gamete.

### Step 2: Evaluate Each Statement
1. **Statement about Isogamy**: This statement is correct as it describes the gametes as similar.
2. **Statement about Anisogamy**: This statement is also correct as it describes the gametes as different.
3. **Statement about Oogamy**: This statement is correct as it accurately describes the characteristics of male and female gametes.
4. **Statement about Pneumoviruses**: This statement claims that the female gamete is smaller and motile while the male gamete is larger and non-motile. This is incorrect because, in oogamy, the female gamete is larger and non-motile, while the male gamete is smaller and motile.

### Step 3: Identify the Wrong Statement
- The fourth statement regarding Pneumoviruses is the only one that is incorrect.

### Conclusion
The wrong statement regarding sexual reproduction is option number 4, which incorrectly describes the characteristics of the gametes in Pneumoviruses.

### Final Answer
**Option Number 4 is the wrong statement regarding sexual reproduction.**

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