AP BIOLOGY

Detailed explanation-1: -The guard cells regulate the opening and closing of stomata. The stomatal pore is wide open when water is freely available during which the guard cells become turgid and closed when water availability is critically low during which the guard cells become flaccid.

Detailed explanation-2: -They are produced in pairs with a gap between them that forms a stomatal pore. The stomatal pores are largest when water is freely available and the guard cells turgid, and closed when water availability is critically low and the guard cells become flaccid.

Detailed explanation-3: -Guard cells use osmotic pressure to open and close stomata, allowing plants to regulate the amount of water and solutes within them.

Detailed explanation-4: -Guard cells surround the stomata and when more water enters in the guard cells it becomes turgid. This causes the opening of stomata.

Detailed explanation-5: -Final answer: When the guard cells lose water, they lose their turgidity and the stomata close.