Cell wall is the most distinguishing feature of plant cells.
Which of the following functions is not performed by plant cell wall?

Options

A. Manufacturing proteins
B. Giving support to the cell
C. Providing shape to the cell
D. Protecting cellular contents

Answer

To determine which function is not performed by the plant cell wall, we can analyze the options provided and understand the role of the cell wall in plant cells.

### Step-by-Step Solution:

1. **Understanding the Cell Wall**:
- The cell wall is a rigid outer layer that surrounds the plant cell membrane. It is primarily made of cellulose and provides structural support, protection, and shape to the cell.

2. **Analyzing the Functions of the Cell Wall**:
- The main functions of the plant cell wall include:
- Providing support and structure to the cell.
- Protecting the cellular contents from external damage.
- Helping to maintain the shape of the cell.

3. **Reviewing the Options**:
- **Option 1**: Manufacturing proteins.
- This function is not associated with the cell wall. Instead, protein synthesis occurs in ribosomes and is facilitated by the rough endoplasmic reticulum.
- **Option 2**: Giving support to the cell.
- This is a primary function of the cell wall.
- **Option 3**: Protecting cellular contents.
- The cell wall does provide protection to the cell.
- **Option 4**: Maintaining cell shape.
- The cell wall helps maintain the shape of the plant cell.

4. **Identifying the Correct Answer**:
- Since the question asks for the function not performed by the plant cell wall, the correct answer is **manufacturing proteins**. This function is not related to the cell wall.

### Conclusion:
The function that is not performed by the plant cell wall is **manufacturing proteins**.