Give the functions of cell wall.
The cell wall performs the following functions.

1. It maintains shape of the cells and provides structural support to the cell.

2. It protects the cells from mechanical injury.

3. It wards off the attacks of pathogens (viruses, bacteria, fungi, protozoans) and protects from infection.

4. It allows the transport of materials in and out of the cell.

5. The cell wall helps in cell to cell interactions.