Roots of a plant typically grow downward, while shoots grow upward. This is most likely the result of differences in the –

Responses

active transport of nutrients in response to light.
active transport of nutrients in response to light., EndFragment,

speed of fluid transport in response to temperature.
speed of fluid transport in response to temperature. , EndFragment,

percentage of open stomata in response to humidity.
percentage of open stomata in response to humidity. , EndFragment,

concentration of auxins in response to gravity.

concentration of auxins in response to gravity.