Here's why:

* Cell wall: This rigid structure is located outside the cell membrane. It's primarily composed of cellulose, which provides strength and support, allowing plants to stand upright and withstand pressure.

* Cell membrane: This flexible structure encloses the cytoplasm and regulates what enters and leaves the cell. It doesn't provide the same level of structural support as the cell wall.

Let me know if you have any other questions about plant cells!