Flagellate isogametes as well as flagellate anisogametes are produced by -

Options

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

Answer

To solve the question regarding which organism produces both flagellate isogametes and flagellate anisogametes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Isogametes**: These are gametes that are of similar size and shape.
- **Anisogametes**: These are gametes that are of different sizes and shapes.
- **Flagellate**: This term indicates that the gametes have flagella, which means they are motile.

2. **Identify the Organisms**:
- The options provided are Spirogyra, Fucus, Angiosperms, and Chlamydomonas.

3. **Analyze Each Option**:
- **Spirogyra**: This is a green alga that produces non-motile gametes (isogamous) and does not have flagellate gametes. Therefore, it cannot produce flagellate isogametes or anisogametes.
- **Fucus**: This is a brown alga that reproduces via oogamy, where one gamete is large and non-motile (egg), and the other is small and motile (sperm). It does not produce isogametes or anisogametes.
- **Angiosperms**: These are flowering plants that do not produce gametes in the same way as algae. They primarily reproduce through seeds and do not produce flagellate gametes.
- **Chlamydomonas**: This is a unicellular green alga that can produce both flagellate isogametes (similar size) and flagellate anisogametes (different sizes). It is known for its motile gametes, which have flagella.

4. **Conclusion**:
- The only organism that produces both flagellate isogametes and flagellate anisogametes is **Chlamydomonas**.

### Final Answer:
**Chlamydomonas** produces flagellate isogametes as well as flagellate anisogametes.

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