The epidermis of the young shoot and leaves contains numerous minute pores called stomata.
functions of stomata .
1)Stomata are essential for exchange of gases between the plant and the atmosphere
-oxygen and carbon dioxide.
2)normally,plants eliminate excessive water in the form of vapour through stomatal openings.The process is called transpiration.
3)When there is shortage of water,stomatal openings get closed.Thus,reduce water lose.Stomatal openings also close down during night.Thus,stomata regulate water lose from plantsi.e;they regulate transpiration.