The cell wall encloses the peripheral layer of cytoplasm surrounded a large central vacuole in
(a) Euglena
(b) Diatoms
(c) Amoeba
(d) Aulosira

Options

A. Euglena
B. Diatoms
C. Amoeba
D. Aulosira

Answer

To solve the question regarding which organism has a cell wall that encloses a peripheral layer of cytoplasm surrounded by a large central vacuole, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question describes a specific cellular structure where the cell wall encloses a peripheral layer of cytoplasm, which is then surrounded by a large central vacuole.

2. **Analyzing the Options**:
- **(a) Euglena**: Euglena is a unicellular organism that has a flexible pellicle instead of a rigid cell wall. It does not fit the description provided in the question.
- **(b) Diatoms**: Diatoms are unicellular algae with a unique cell wall made of silica, known as frustule. They have a structure where the cell wall encloses a peripheral layer of cytoplasm, and they typically contain a large central vacuole. This matches the description in the question.
- **(c) Amoeba**: Amoeba is a protozoan that does not have a defined cell wall. It has a flexible plasma membrane and does not fit the description.
- **(d) Aulosira**: Aulosira is a filamentous cyanobacterium, which also does not have a cell wall structure that fits the description given.

3. **Conclusion**: Based on the analysis, the organism that fits the description of having a cell wall enclosing a peripheral layer of cytoplasm surrounded by a large central vacuole is **(b) Diatoms**.

### Final Answer:
(b) Diatoms