Why is the cell wall responsible for the crispness of vegetables

The outermost covering of a plant cell is called cell wall. It is made up of cellulose. It surrounds the cell membrane. Its function is to protect the cell, provide mechanical support and maintain the pressure inside the cell. Fluid collects in the vacuole and pushes out against the cell wall. This turgid  pressure is responsible for the crispiness of fresh vegetables and flowers.

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Dthrough a slow process