Stomata in Plants | Definition, Purpose & Types

Microscopic footage of the stomata of a plant leaf opening and...

Ever seen a leaf breathe?This video shows stomata opening and closing.A stomata is a microscopic pore on the leaf surface, bordered by two bean-shaped guard cells that act like gates, controlling gas exchange and water loss.The opening and closing of stomata by guard cells is controlled by the pressure of water inside them, called turgor pressure.During the day, light triggers K⁺ uptake, increasing solute concentration inside guard cells, so water moves in by osmosis, the cells swell, and the po