Vacuole of a plant cell has to be large because it takes part in maintaining the water level of the cell, i.e. entry and exit of water. In addition, vacuole helps in-
(a) Storage- It store sugars, amino acids, organic acids, salts and some proteins.
(b) Cellular wastes- They are dumped in the vacuole.
(c) Turgidity- The vacuole contains cell sap, which provides turgidity to the cells.
(d) Absorption of water- Vacuole contains an osmotic concentration, required for absorption of water.
