Question

how do guard cells regulate opening and closing the pores of stomata ? In points​

Answer 1

When water enters the guard cell , they swell and thus cause the stomata to open and when water leaves the guard cell , it shrinks causing the stomata to close.

Answer 2

In stomata opening n closing is regulate by the concentration of the liqid. guard cell transferring it's water to the next cell n become flat called flaccid after removing water. n again filled with water and come close to now stomata is closed.