Here's why:

* Plant cells have a large central vacuole that takes up most of the cell's volume. This vacuole plays a crucial role in maintaining cell turgor (rigidity), storing water and nutrients, and regulating the cell's internal environment.

* Animal cells may have vacuoles, but they are much smaller and more numerous. They are called vesicles and are involved in various cellular processes, like transport and storage.

So, the defining feature of a plant cell that distinguishes it from an animal cell is the presence of a large central vacuole.