Which of the following layer is present nearest to plasma membrane in plant cell

Options

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

Answer

To determine which layer is present nearest to the plasma membrane in a plant cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Plant Cell Walls**:
- Plant cells have a cell wall that is made up of multiple layers. The primary wall is the first layer formed during cell growth, while the secondary wall is formed later and is located inside the primary wall.

2. **Identify the Layers**:
- The layers mentioned in the question are:
- **Secondary Wall**: Located inside the primary wall.
- **Primary Wall**: The outermost layer of the cell wall.
- **Middle Lamella**: A layer that acts as a glue between adjacent plant cells.
- **Tonoplast**: The membrane surrounding the central vacuole.

3. **Determine the Nearest Layer to the Plasma Membrane**:
- The plasma membrane is located just beneath the cell wall. Therefore, the layer that is closest to the plasma membrane must be the outermost layer of the cell wall.

4. **Analyze the Options**:
- **Secondary Wall**: This is not the correct answer as it is located inside the primary wall.
- **Primary Wall**: This is the outermost layer and is directly adjacent to the plasma membrane.
- **Middle Lamella**: This is located between adjacent cells and not directly next to the plasma membrane.
- **Tonoplast**: This is the membrane of the central vacuole and is not part of the cell wall.

5. **Conclusion**:
- The layer that is present nearest to the plasma membrane in a plant cell is the **Primary Wall**.

### Final Answer:
The correct answer is the **Primary Wall**.

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