Question

What causes the opening and closing of guard cells of stomata during transpiration?

Answer 1

stomatal openings states that water is filled in guard cells and if they are closed it means that water is diffused from them

Answer 2

The tiny pores present on the surfaces of leaves are called stomata.

It help in the exchange of gases.

The opening and closing of the guard cells is the result of a change in their turgidity.

The turgidity of the guard cells increases at the time of the opening of the stomata and it loses in the case of closing.