A non-living structure of cell is

Options

A. Cell wall
B. Plasma membrane
C. Cytoplasm
D. Nucleus

Explanation

### Step-by-Step Solution:

1. **Identify the Structures of a Cell**:
- A cell consists of various structures, some of which are living and some are non-living.

2. **Differentiate Between Living and Non-Living Structures**:
- Living structures include organelles such as the nucleus, mitochondria, lysosomes, and chloroplasts. These structures are involved in the cell's metabolic processes and functions.
- Non-living structures, on the other hand, do not participate in metabolic activities.

3. **Identify the Non-Living Structure**:
- The primary non-living structure of a cell is the **cell wall**. This structure is found in plant cells, some bacteria, and fungi, but is absent in animal cells.

4. **Understand the Function of the Cell Wall**:
- The cell wall provides protection to the cell and helps maintain its shape. It is a rigid layer that surrounds the plasma membrane.

5. **Conclusion**:
- Therefore, the answer to the question "A non-living structure of cell is" is the **cell wall**.