Final answer:
The central vacuole in plant cells contains a hypertonic solution that provides turgor pressure to maintain the plant's structure. Turgor pressure is crucial for plant rigidity, and the tonoplast membrane of the vacuole helps regulate cell's water concentration and supports metabolic functions.
Step-by-step explanation:
The central vacuole in plant cells contains a hypertonic solution, which plays a crucial role in providing the turgor pressure required for maintaining the plant's structure and rigidity. Turgor pressure is the outward pressure exerted by the vacuole's fluid against the cell wall, helping to keep the plant upright. This is particularly evident when a plant wilts due to water loss; the central vacuole shrinks, and turgor pressure decreases, leaving the plant's cells flaccid.
Additionally, the central vacuole serves multiple functions, including the regulation of the cell's water concentration in response to environmental changes, storing proteins and pigments, and being a site for many metabolic reactions. It is enclosed by a membrane called the tonoplast, which aids in maintaining the appropriate balance of substances inside the vacuole, thereby contributing to the overall health and functioning of the plant cell.