Which organelle stores water and helps to maintain the plant cell shape?

The organelle that stores water and helps to maintain the shape of a plant cell is the vacuole. Vacuoles are membrane-bound compartments within plant cells that can occupy a large part of the cell's interior. They are primarily responsible for storing water, nutrients, and waste products. The pressure of the water inside the vacuole creates turgor pressure against the cell wall, which is crucial for maintaining the plant's structural integrity and overall shape. When a plant has enough water, the vacuoles are filled, and the plant appears firm and upright. Conversely, if the vacuoles lose water, the plant can wilt, showing the importance of this organelle in plant health.