Guard cells are the two curved cells on either side of the pore (hole). By changing their shape they can open or close the pore.When the guard cells absorb water they bend outwards, so that the pore...
Guard cells change shape to open and close stomata. When they are flaccid, the stoma is closed. When they are full of water and firm, the stoma is open. There are 2 guard cells controlling a stoma....