Glassy and sculptured cell wall is a feature of

Options

A. Diatoms
B. Fire algae
C. Euglenoids
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the organism that has a "glassy and sculptured cell wall." We need to identify which of the given options (diatoms, fire algae, oglenoids, or all of these) fits this description.

2. **Analyzing the Options**:
- **A. Diatoms**: Diatoms are known for their unique silica-based cell walls that are often described as glassy and sculptured. They have two thin overlapping shells that resemble a soap box.
- **B. Fire Algae**: Fire algae, or dinoflagellates, do not typically have glassy cell walls; they have a different structure.
- **C. Oglenoids**: Oglenoids, or euglenoids, also do not possess glassy cell walls; their cell structure is different from that of diatoms.
- **D. All of these**: This option suggests that all the mentioned organisms share the characteristic of having a glassy and sculptured cell wall, which is not true.

3. **Identifying the Correct Answer**: Based on the analysis, the only group that has a glassy and sculptured cell wall is **diatoms**.

4. **Conclusion**: Therefore, the correct answer to the question is **A. Diatoms**.