Reticulate chloroplast occur in :-

Options

A. Ulothrix
B. Oedogonium
C. Spirogyra
D. Chlamydomonas

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks where reticulate chloroplasts occur. Reticulate chloroplasts are a specific type of chloroplast that form a cylindrical network.

2. **Definition of Reticulate Chloroplasts**: Reticulate chloroplasts are characterized by their complex structure, which forms a network that can be found in certain types of algae.

3. **Identifying the Options**: The options provided are:
- Option 1: Eulothrix
- Option 2: Oedogonium
- Option 3: Spirogyra
- Option 4: Lemidomonas

4. **Analyzing Each Option**:
- **Eulothrix**: This type of green algae does not have reticulate chloroplasts.
- **Oedogonium**: This is a green filamentous algae known to have reticulate chloroplasts that encircle the protoplast completely. This is the correct answer.
- **Spirogyra**: This type of green algae has spiral-shaped chloroplasts, not reticulate ones.
- **Lemidomonas**: This algae does not have reticulate chloroplasts either.

5. **Conclusion**: Based on the analysis, the correct answer is **Option 2: Oedogonium**.

### Final Answer:
Reticulate chloroplasts occur in **Oedogonium**.

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