Q. How do the guard cells regulate opening and
closing of stomatal pores?
Ans. Stomata are tiny openings present on the
underside of the leaf. The stomatal openings
are surrounded two bean shaped cells. These
are called guard cells. The main function of the
guard cells is to control the opening and closing
of stomata. When water enters the guard cell, it
swells. This results in the opening of the guard cells.
On the other hand, the shrinking of the
guard cell results in the closing of the stomatal