Question

Why do plant cells possess large sized vacuole?

Answer 1

Vacuoles also play an important role in plant structure. Most of a plant cell's volume depends on the material in vacuoles. Those vacuoles gain and lose water depending on how much water is available to the plant.

Answer 2

Plant cells have a higher amount of liquid content in the form of water needed for their food, cell sap, etc., and thus large sized vacuoles help in maintaining the turgidity & rigidity of the plant cell and maintaining the water content of the cells.