The release of water from the vacuoles of the cells caused the plant to wilt and droop. The in the plant's cells helps the plant to maintain its structure during this period of stress.

Vacuole; Cell wall

Explanation:

The release of water from the VACUOLES of the cells caused the plant to wilt and droop. The CELL WALL in the plant's cells helps the plant to maintain its structure during this period of stress.

Vacuoles are organelles which help in the storage of fluids which may include water, digestion and excretion(release) of excess water in the cells.

Cell walls on the other hand helps to provide structural support in plants and usually surrounds the membranes on the outer part.