Anisogamous conditions is seen in

Options

A. Spirogyra
B. Volvox
C. Fucus
D. Chlamydomonas

Answer

To determine which organism exhibits anisogamous conditions, we need to understand the definition of anisogamy and analyze the options provided.

### Step-by-Step Solution:

1. **Understand Anisogamy**:
- Anisogamy refers to a type of sexual reproduction involving the fusion of dissimilar gametes. This means that the gametes differ in size, shape, or structure.

2. **Analyze the Options**:
- **Option 1: Spirogyra**:
- In Spirogyra, sexual reproduction occurs through the fusion of gametes that are similar in size and structure. This is an example of isogamy, not anisogamy.

- **Option 2: Volvox**:
- Volvox reproduces sexually through oogamous reproduction, where the male gametes are smaller and numerous, while the female gamete is larger. This is not anisogamy.

- **Option 3: Fucus**:
- Fucus also exhibits oogamous reproduction, similar to Volvox, with distinct male and female gametes. Thus, it does not represent anisogamy.

- **Option 4: Chlamydomonas**:
- Chlamydomonas can exhibit anisogamous reproduction in certain species, where the gametes are dissimilar in size. This means that some gametes are larger than others, fitting the definition of anisogamy.

3. **Conclusion**:
- After analyzing all options, the organism that exhibits anisogamous conditions is **Chlamydomonas**.

### Final Answer:
The correct answer is **Chlamydomonas**.

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