Correct Answer: Endosmosis

Solution : The correct option is Endosmosis .

Endosmosis is the mechanism by which plant guard cells open their stomata. The passage of water over a semi-permeable membrane from a low solute concentration area to a high solute concentration area is osmosis. Water travels into guard cells as a result of the concentration of potassium ions (K+) within the guard cells. Water absorption by guard cells via osmosis turgor pressure helps in stomatal opening.