Stoma, found in the epidermis of leaves closes when guard cells _______.

Stomatal Closure: As the guard cells dry out, the turgidity of these cells decreases, and they relax. As a result, these cells contract and become erect, causing the stomatal pore to shut.

• Water Conservation: This is a very important adaptation that assists the plant in reducing water loss.
• Osmotic Movement: The loss of water occurs due to the increased water potential on the outside of the guard cells, which results from the movement of solutes like potassium ions (K+) out of the guard cells.