direction of light English English fototropisme phototropism http://en.wikipedia.org/wiki/Phototropism phototropism http://en.wikipedia.org/wiki/Phototropism English phototropism phototropism concentration of auxin photo-tropic photoattractant phototropism Phototrophism phototropism Phototropism (wikipedia.org) English phototropism (wikipedia.org) (wikipedia.org) phototropism https://en.wikipedia.org/wiki/Phototropism phototropism phototropism (wikipedia.org) (wikipedia.org) English fototropisme Phototropism photoattractant Plants grow toward the sun phototropism phototropism (wikipedia.org) photo-tropism positive phototropism; phototropism en.wikipedia.org/wiki/Phototropism phototropism phototropism (wikipedia.org) phototropism (wikipedia.org) (wikipedia.org) (wikipedia.org) en.wikipedia.org/wiki/Phototropism plants can grow towards sunlight (wikipedia.org) פוטוטרופיזם (wikipedia.org) (wikipedia.org) phototropism phototropism phototropism phototropism (wikipedia.org) (wikipedia.org) phototropism SunflowerFacesFollowTheSun phototropism English English phototropic effect phototropism phototropism concentration of auxin English phototropism fototropismo Phototropism English phototropic phototropism takes several days to effect plant). 2.