Why Might a cell need a cell wall addition to a plasma membrane?

A cell wall provides structural support and protection beyond what a plasma membrane can offer. It helps maintain cell shape, prevents osmotic lysis in hypotonic environments, and provides rigidity, which is especially important for plant cells, bacteria, and fungi. Additionally, the cell wall can act as a barrier against pathogens and contribute to cell-to-cell communication and signaling. Overall, it enhances the cell's ability to withstand external stresses.