Isogametes are present in

Options

A. Fuccus
B. Cladophora
C. Frog
D. Bird

Answer

To determine where isogametes are present, we need to analyze the options provided: Fucus, Cladophora, Frog, and Bird.

### Step-by-Step Solution:

1. **Understanding Isogametes**:
- Isogametes are gametes that are similar in size, shape, and morphology. They cannot be classified as male or female.

2. **Analyzing the Options**:
- **Fucus**: This organism produces anisogametes, which means it has gametes that are different in size and/or morphology. Specifically, Fucus has a large ovum and a smaller motile sperm.
- **Cladophora**: This organism produces isogametes. The gametes in Cladophora are similar in size and shape, fitting the definition of isogametes.
- **Frog**: Frogs also produce anisogametes, with a large ovum and a smaller motile sperm.
- **Bird**: Birds produce anisogametes as well, with distinct male and female gametes.

3. **Conclusion**:
- Among the options, Cladophora is the only organism that produces isogametes.

### Final Answer:
Isogametes are present in **Cladophora**.