Question : Stomatal opening is based on which of the following?
Option 1: Exosmosis
Option 2: Endosmosis
Option 3: Plasmolysis in guard cells
Option 4: Decrease in concentration of cell sap
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.
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