Cell wall has stiff cellulose plates on the surface of cells in

Options

A. Gonyaulax
B. Euglena
C. Diatoms
D. Slime moulds

Answer

To answer the question "Cell wall has stiff cellulose plates on the surface of cells in," we will analyze the options provided one by one.

### Step-by-Step Solution:

1. **Understanding Cell Walls**: The question is asking about organisms that have a cell wall made of stiff cellulose plates. Cellulose is a polysaccharide that is a key component of the cell walls in plants and some algae.

2. **Analyzing the Options**:
- **Option A: Goniolex**: Goniolex is a dinoflagellate. Dinoflagellates do have a cell wall that contains stiff cellulose plates. Therefore, this option is correct.

- **Option B: Euglena**: Euglena is a genus of single-celled organisms that are flagellates. They do not have a true cell wall; instead, they have a flexible pellicle. Thus, this option is incorrect.

- **Option C: Diatoms**: Diatoms are a type of algae that have cell walls made of silica (SiO2), not cellulose. Their cell walls are intricately structured but do not contain cellulose. Hence, this option is also incorrect.

- **Option D: Slime Molds**: Slime molds do not have a cell wall made of cellulose. They are classified in the kingdom Protista and typically lack a rigid cell wall. Therefore, this option is incorrect as well.

3. **Conclusion**: After analyzing all the options, the only organism that has a cell wall with stiff cellulose plates is **Goniolex**. Thus, the correct answer is **Option A: Goniolex**.

### Final Answer:
The cell wall has stiff cellulose plates on the surface of cells in **Goniolex**.