transpirtion

some of the water taken in through the root of plants

transpiration

howerver, plants lose most of the water through the leaves. this procees is called transpiration.

without a way to control transpiration, plants would wither up and die. fortunately,plants are able to slow down transpiration.

guard cells ,mostly on the under side of the leaf ,open and close the stomata.

when the stomata are closed , water cannot escape from the leaf.