The part of a cell that stores water is called the vacuole. In plant cells, the vacuole is usually large and central, taking up much of the cell’s volume. In animal cells, vacuoles are smaller and more numerous.
The primary function of the vacuole is to maintain turgor pressure, which helps keep the plant rigid and upright. When the vacuole is filled with water, it exerts pressure against the cell wall, creating a condition that supports the plant structurally. Additionally, vacuoles can store nutrients, waste products, and other substances, playing an essential role in the overall health of the cell.