Here's why:
* Cell walls provide structural support: Cell walls are made of cellulose, a tough and rigid material. This rigidity helps the plant cells maintain their shape and resist internal pressure from water.
* Internal pressure: Plant cells are filled with water, creating a pressure called turgor pressure. This pressure pushes against the cell wall, making the cell firm and helping the plant stand upright.
* Growth through cell division: Plants grow tall by producing new cells at their tips. These new cells have cell walls that are also rigid, contributing to the plant's overall height.
Without cell walls, plants would be flimsy and unable to stand tall.
