noun. an orienting reaction, particularly of a plant, either toward or veered away from light. It is obviously different from phototaxis, which is active motion of an organism in reaction to light.

PHOTOTROPISM: "Phototropism is the reason hanging plants grow upward toward the windows they are placed in, sometimes even intertwining themselves into curtains and blinds on windows."
Cite this page: N., Sam M.S., "PHOTOTROPISM," in, April 7, 2013, (accessed October 22, 2021).