Which of the following group members possess cell wall with stiff cellulose plates on its outer surface ?

Options

A. Chrysophytes
B. Euglenoids
C. Dinoflagellates
D. Slime moulds

Answer

To solve the question regarding which group members possess a cell wall with stiff cellulose plates on its outer surface, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Groups**: The question mentions four groups: chrysophytes, tubulinoids, dinoflagellates, and slime molds. We need to analyze each group to determine their cell wall composition.

2. **Analyze Chrysophytes**:
- Chrysophytes include diatoms and golden algae.
- Their cell wall is made of hydrated silica, not cellulose.
- **Conclusion**: Chrysophytes do not have a cell wall with cellulose plates.

3. **Analyze Tubulinoids**:
- Tubulinoids are a lesser-known group and are typically not characterized by a specific cell wall structure.
- For the purpose of this question, we can assume they do not have cellulose plates.
- **Conclusion**: Tubulinoids do not have a cell wall with cellulose plates.

4. **Analyze Dinoflagellates**:
- Dinoflagellates are known for possessing stiff cellulose plates on their outer surface.
- These plates provide structural support and are a defining characteristic of this group.
- **Conclusion**: Dinoflagellates do have a cell wall with stiff cellulose plates.

5. **Analyze Slime Molds**:
- Slime molds do have a cell wall, but only in their spore form.
- In their vegetative phase, they lack a cell wall.
- **Conclusion**: Slime molds do not have a cell wall with cellulose plates in their vegetative phase.

6. **Final Conclusion**: Based on the analysis, the only group that possesses a cell wall with stiff cellulose plates on its outer surface is **dinoflagellates**.

### Final Answer:
**Dinoflagellates** possess a cell wall with stiff cellulose plates on its outer surface.