Which of the following is a function of cell wall ?

Options

A. Absorption
B. Secretion
C. Protection
D. All

Answer

To answer the question "Which of the following is a function of the cell wall?" we need to analyze the functions of the cell wall in detail.

### Step-by-Step Solution:

1. **Understanding the Structure of the Cell Wall**:
- The cell wall is a rigid outer layer found in plant cells, fungi, and some bacteria. It provides structural support and protection to the cell.

2. **Function 1: Providing Support and Shape**:
- The primary function of the cell wall is to provide support and maintain the shape of the cell. It helps the plant stand upright and resist external pressures.

3. **Function 2: Protection**:
- The cell wall protects the cell from mechanical damage and pathogens. It acts as a barrier against physical injury and infection.

4. **Function 3: Cell-to-Cell Interaction**:
- The cell wall facilitates cell-to-cell interactions. It allows for communication and transport of materials between adjacent cells.

5. **Function 4: Acting as a Barrier**:
- The cell wall acts as a barrier to undesirable substances, preventing harmful molecules from entering the cell while allowing necessary nutrients to pass through.

6. **Function 5: Absorption and Secretion**:
- The cell wall is involved in the absorption of useful materials and the secretion of fluids necessary for the cell's functions.

7. **Conclusion**:
- Since the cell wall performs multiple functions including absorption, secretion, and protection, the correct answer to the question is "all of the above."

### Final Answer:
The function of the cell wall includes absorption, secretion, and protection. Therefore, the answer is "all."

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