The cell wall gives the plant its actual shape. It acts as a gatekeeper, because it determines what can come in and out of the cell in order to keep the cell protected.
Also it protects the plant cell from extreme climatic conditions .
The cell wall of the plant cell is made up of cellulose.It occurs as a protective covering surrounding the plasma membrane. It is highly permeable allowing the substances in a solution to enter and leave the cell wall.

.It provides shape to the plant cell.

.It provides rigidity to the cell.

.It gives protection to the inner structure and plasma membrane of the plant cell.

hope this helps.. :)))