Question

Explain in brief the opening and closing mechanism of stomata.

Answer 1

The opening and closing of stomata depend upon the changes in the turgidity of their guard cells. Due to the absorption of water, the guard cells become turgid. Their inner walls are pulled apart by their outer wall. The gap between the guard cells becomes wider and stomata open. When guard cells are flaccid due to loss of water, the outer walls are not stretched, their inner walls are not pulled apart decreasing the gap between the guard cells and stomata close.