What does the cell vacuole primarily store in plant cells?

The cell vacuole in plant cells primarily stores water, which is crucial for maintaining turgor pressure. Turgor pressure is the pressure of the cell contents against the cell wall and helps keep the plant upright and rigid. In addition to water, vacuoles can also store nutrients, waste products, and other substances, but water is the most significant component due to its role in cellular functions and overall plant health. The vacuole can occupy a substantial portion of the cell's volume, allowing it to function as a reservoir for water and other materials, contributing to the plant's ability to withstand drought and other environmental stresses. This storage function is essential for sustaining cellular processes and ensuring the plant's survival and growth.