BOTANY

Detailed explanation-1: -The cell walls of guard cells are unevenly thickened, the outer wall is thin and the inner wall is thick. Due to this differential, they attain a turgid state and open the stomatal pores (stoma) because of the turgor pressure that expands the cells.

Detailed explanation-2: -Upon the incoming of water inside the guard cells, they swell up to become like a curved banana surface, due to which the stomatal pore opens up. When the guard cells lose water, they become flaccid and straight and thus, close the stomatal aperture. Guard cells and stomata regulates the respiration process in plants.

Detailed explanation-3: -The aperture of the stomatal pore is controlled by the two guard cells. When the guard cells are fully turgid the pore gapes open, whereas when they lose turgor the pore closes.

Detailed explanation-4: -The opening and closing of stomata is due to the change in the turgidity of guard cells. When water enters into the guard cells, they become turgid and the stoma opens. When the guard cells lose water, it becomes flaccid and the stoma closes.