VCE Biology Unit 1 Area of Study (AOS) 1 Practice Test

Plant cells rely on a large central vacuole to manage water balance and waste storage. By taking in or releasing water and ions, the vacuole controls the osmotic conditions inside the cell. When the vacuole is full of water, it creates turgor pressure—the pressure of the cell contents against the cell wall—which helps keep the plant rigid and upright. If the vacuole loses water, turgor pressure drops and the plant wilts. While other organelles have important roles—lysosomes digest waste, the Golgi apparatus processes and ships molecules, and the nucleus stores genetic material—the vacuole is the key structure for storing waste and regulating turgor pressure in plant cells.