Question

How do the guard cells regulate opening and closing a stomatal pore ???

Answer 1

Stomatal pores in plants regulate the amount of water and solutes within them by opening and closing their guard cells using osmotic pressure. In order for plants to produce energy and maintain cellular function, their cells undergo the highly intricate process of photosynthesis

Answer 2

When guard cells contain water they swell up and opens the opening of stomata and when guard cells loss water because of Osmosis process then they shrink and the stomata opening close.