Outermost layer of cell wall is

Options

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

Answer

To answer the question about the outermost layer of the cell wall, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Cell Wall**:
- The cell wall is a structure found in plants, fungi, and some protists. It serves as a protective layer and provides support to the cell.

2. **Identifying the Layers of the Cell Wall**:
- The cell wall consists of three main layers:
- **Primary Cell Wall**: This is the outermost layer, which is flexible and extensible.
- **Secondary Cell Wall**: This layer is located inside the primary cell wall and is thicker.
- **Middle Lamella**: This layer is rich in pectin and acts as a glue between the cell walls of adjacent cells.

3. **Determining the Outermost Layer**:
- Among the three layers, the primary cell wall is the outermost layer. It is the first layer that is formed during cell growth and is crucial for the cell's flexibility.

4. **Conclusion**:
- Therefore, the correct answer to the question "Outermost layer of cell wall is" is the **Primary Wall**.

### Final Answer:
The outermost layer of the cell wall is the **Primary Wall**.

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