AP BIOLOGY

Detailed explanation-1: -This take place because when the guard cells are turgid, while the subsidiary cells are flaccid, the stoma remains open, but when the guard cells lose water into subsidiary cells the guard cells become flaccid while the subsidiary cells turns turgid, which results in the closure of the stoma.

Detailed explanation-2: -During water scarcity, the guard cells become flaccid. This closes the stomatal pore allowing less water to be sent out through transpiration.

Detailed explanation-3: -When the two guard cells are turgid (swollen with water), the stoma is open, and, when the two guard cells are flaccid, it is closed.

Detailed explanation-4: -Water stress, high temperatures, and high carbon dioxide concentration causes stomata to close.

Detailed explanation-5: -When the water enters the guard cells, the guard cells become turgid. The thin outer wall in the turgid guard cells is pushed outside; it pulls the thicker inner wall outside. Due to this stomata opens. When the solute decreases in the guard cells, they become flaccid.