Question

Moving water up a plant from the roots to the leaves occurs by a combination of different processes (steps). The main process that draws water up the stem is..

a) osmosis
b) transpiration
c) diffusion
d) capillary action

Answer 1

B

Transpiration is ultimately the main driver of water movement in xylem. The cohesion-tension model works like this: Transpiration (evaporation) occurs because stomata are open to allow gas exchange for photosynthesis.