about stomata (in chinese)

stomata會唔會close? Yes, whether it close or not depends on its turgidity.
When it opens, the following occurs
During the light condition, (photo.occurs), CO2 diffuses into the cells and sugar is produced. This(sugar) makes the stomata cell have lower osmotic potential. Hence, it absorbs water form the neighbouring cells. The cell becomes turgid and Hence it opens.

When it closes, the following occurs
During dark condition, sugar is converted to starch for storage. Hence, the osmotic potential of the cell is thus increased. The turgidity has lost and stomata close.