Question

How do the guard cells regulate the opening and closing of stomatal pores?

Answer 1

• Opening of guard cells is facilitated by the entry of water inside guard cells. 
• This make the guard cell become turgid. 
• Closing of guard cells is facilitated by water coming out of guard cells. 
• This will make the guard cells flaccid. 
• Entry of water inside guard cells will make the cell turgid leading to the opening of stomata. 
• Similarly cell become flaccid when water come out of guard cells, this leads to closing of the stomata.