Brightstorm Q & A : ''abscisic acid tends to inhibit growth and often works in opposition to auxins and gibberellins. It can cause the dormancy that's involved in helping plants slow down for things like winter. And they're involved in helping close the stomata, the openings that plants use everyday to allow carbon dioxide in and oxygen out of the plant.''  so whats the point of closing the stomata ? it wont allow the plant to exchange gases rite? so how does it help the plant in any way ??