Wall layer of a typical plant cell composed by cellulose is

Options

A. Primary cell wall
B. Secondary cell wall
C. Tertiary cell wall
D. All the above

Answer

To answer the question regarding the wall layer of a typical plant cell composed of cellulose, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Plant Cell Walls**:
- Plant cells have a rigid outer layer known as the cell wall, which provides structure and support.

2. **Identifying Cell Wall Types**:
- There are primarily two types of cell walls in plants: the primary cell wall and the secondary cell wall.

3. **Composition of the Primary Cell Wall**:
- The primary cell wall is primarily composed of cellulose, a polysaccharide that provides strength and flexibility. It also contains other components like pectin and hemicellulose.

4. **Composition of the Secondary Cell Wall**:
- The secondary cell wall, which forms after the primary cell wall, also contains cellulose but has a higher content of lignin, which adds rigidity and strength.

5. **Location of Primary Cell Wall**:
- The primary cell wall is found in meristematic tissues, which are regions of active cell division. This is because the primary cell wall is thin and flexible, allowing for growth.

6. **Conclusion**:
- Given that the question specifically asks for the wall layer composed of cellulose, the correct answer is the primary cell wall, as it has the highest cellulose content compared to the secondary wall.

### Final Answer:
The wall layer of a typical plant cell composed of cellulose is the **primary cell wall**.

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