Here's why:

* Large Central Vacuole: Plant cells have a large, central vacuole that takes up most of the cell's volume.

* Water Storage: This vacuole is filled with water and other dissolved substances, acting as a storage reservoir.

* Turgor Pressure: The water in the vacuole creates turgor pressure, which helps maintain the cell's shape and rigidity, giving plants their upright structure.

* Other Functions: Vacuoles also play roles in waste storage, nutrient transport, and maintaining cell pH.