The function of the vacuole in a plant cell is to store various substances, including water, nutrients, and waste products. Vacuoles help maintain turgor pressure, which keeps the plant cell rigid and supports overall plant structure. In addition to storage, vacuoles play a role in cell growth by allowing cells to enlarge without the need for additional cytoplasm. They can also contribute to plant defense by storing toxic metabolites. Overall, vacuoles are vital for maintaining cellular homeostasis and supporting a plant’s vital processes.