All BUT one is a function of the cell wall. That is

The outer covering of plant cell that surrounds the plasma membrane of the plant cell is known as cell wall.

Explanation:

Functions of cell wall

1 Cell wall provides mechanical strength to the cell and also makes the cell rigid.

2 Cell wall protect the cell during change in the osmotic pressure. On the other hand it can be stated that cell wall protect the cell from osmotic lysis.