of the volume of plant cells is taken up by the central vacuole.
It has several functions. It controls the water balance, is
dump site for hazardous wastes, store sugars and amino acids.
dissolved substances make it very hypertonic to the cell
cytoplasm. So water enters the vacuole wich swells. This
pressure that pushes the cytoplasm against the cell wall
is called turgor pressure. The shape anf
rigidity of the cell depends on turgor pressure.