Select the wrong statement

Options

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

Answer

To solve the question of selecting the wrong statement regarding isogamy, anisogamy, and oogamy, let's analyze the statements provided step by step.

### Step 1: Understand the terms
- **Isogamy**: This refers to the fusion of gametes that are morphologically similar in size and shape. Both gametes are usually motile.
- **Anisogamy**: This involves the fusion of gametes that are different in size; typically, one is larger and non-motile (female) and the other is smaller and motile (male).
- **Oogamy**: This is a type of anisogamy where the female gamete is large and non-motile, while the male gamete is small and motile.

### Step 2: Analyze the statements
1. **Statement 1**: "In isogamy, gametes differ either in structure, function, or behavior."
- This is incorrect because isogamy involves gametes that are similar in structure, function, and behavior.

2. **Statement 2**: "In isogamy, the female gamete is smaller and motile while the male gamete is larger and non-motile."
- This statement is incorrect as it describes anisogamy, not isogamy.

3. **Statement 3**: "Chlamydomonas exhibits isogamy, and Fucus shows oogamy."
- This statement is correct. Chlamydomonas does exhibit isogamy, and Fucus is an example of oogamy.

### Step 3: Identify the wrong statement
From the analysis:
- Statement 1 is wrong because it misdefines isogamy.
- Statement 2 is also wrong as it describes anisogamy.
- Statement 3 is correct.

### Conclusion
The wrong statements are Statement 1 and Statement 2. However, if we are to select only one, Statement 1 is the most misleading regarding the definition of isogamy.

### Final Answer
The wrong statement is: **"In isogamy, gametes differ either in structure, function, or behavior."**

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