Question

The opening and closing of stomata is due to osmosis.

It's true but why does it happen?

Answer 1

Yes, it is true. The opening and closing of stomata occurs through osmosis. The opening and closing of stomata is regulated by the movement of water in and out of the guard cells. When water moves into the guard cells, they become flaccid. This causes the outer walls of cells bulge out and vice-versa.