Which cell structure functions as a storage site for water

Vacuole

Explanation:

The vacuole is known as the storage house of a cell. It stores excess water, minerals as well as waste material of a cell. A plant cell has a much bigger vacuole as compared to an animal cell. The vacuole in a plant cell is located in the centre of the cell. Apart from acting as a storage house, the vacuole also forms the shape of a plant cell.

The animal cell, however, possesses a smaller vacuole which is not located in the centre of the cell.