Which of the following layers of cell wall is found closest to the plasma membrane?

Options

A. Middle lamella
B. Primary wall
C. Tertiary wall
D. Secondary wall

Answer

To answer the question "Which of the following layers of cell wall is found closest to the plasma membrane?" we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Plant Cell Wall**:
- The plant cell wall is composed of multiple layers that surround the plasma membrane. These layers provide structural support and protection to the cell.

2. **Identify the Layers of the Cell Wall**:
- The main layers of the plant cell wall include:
- **Middle Lamella**: This is the layer that acts as a glue between adjacent plant cells.
- **Primary Cell Wall**: This is the first layer formed during cell growth and is flexible.
- **Secondary Cell Wall**: This layer is formed after the primary wall and is thicker and more rigid.
- **Tertiary Cell Wall**: This layer is found in some cells and is the innermost layer.

3. **Determine the Position of Each Layer**:
- The order of the layers from the innermost (closest to the plasma membrane) to the outermost is:
- Tertiary Cell Wall (innermost)
- Secondary Cell Wall
- Primary Cell Wall
- Middle Lamella (outermost)

4. **Identify the Closest Layer to the Plasma Membrane**:
- Since the question asks for the layer closest to the plasma membrane, we look at our identified layers. The **Tertiary Cell Wall** is the closest layer to the plasma membrane.

5. **Conclude the Answer**:
- Therefore, the answer to the question is the **Tertiary Cell Wall**.

### Final Answer:
The layer of the cell wall found closest to the plasma membrane is the **Tertiary Cell Wall**.