Final answer:
When plants wilt, their soft stems and leaves droop due to the shrinking of the central vacuole.
Step-by-step explanation:
When plants wilt, the cells experience a loss of turgidity, which is caused by the shrinking of the central vacuole. The central vacuole is responsible for maintaining the cell's shape and providing support to the soft stems and leaves. As the vacuole shrinks, the cells lose their rigidity, causing the stems and leaves to droop.
Learn more about Plant wilting