When water evaporates through the stomata, negative pressure is created within the cells and the xylem (i.e. the woody tissue that transports water up from the roots).

With thick cell walls that add structural support to the plant, xylem become useful as water carriers once they reach maturity, at which point they’re completely dead. The water then evaporates into ...

By binding to different receptors, the hormone controls the formation of not only xylem (the vessels that transport water up from the roots), but also stomata (the leaf pores through which water ...