Which layer of cell wall is found outside cell membrance ?

Options

A. Primary wall
B. secondary wall
C. Tonoplast
D. Tertiary wall

Answer

To answer the question "Which layer of the cell wall is found outside the cell membrane?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cell Structure**: Recognize that plant cells have a cell wall in addition to the cell membrane (plasma membrane). The cell wall is located outside the cell membrane.

2. **Identifying Layers of the Cell Wall**: The cell wall consists of several layers:
- **Middle Lamella**: This is the first layer that is formed when two adjacent plant cells divide. It is rich in pectin and helps in adhesion between cells.
- **Primary Wall**: This is the layer that is formed next and is located outside the middle lamella. It is composed mainly of cellulose and hemicellulose.
- **Secondary Wall**: This layer is formed inside the primary wall and is thicker, providing additional support and strength to the cell.
- **Tertiary Wall**: This is a thin layer that may be present outside the secondary wall in some cells, but it is not commonly discussed as a primary structure.

3. **Conclusion**: The layer of the cell wall that is found outside the cell membrane is the **Primary Wall**.

### Final Answer:
The layer of the cell wall found outside the cell membrane is the **Primary Wall**.