the.com/tropism

means The automatic bending or growth of an organism toward or away from a stimulus like light, water, or gravity, with no decision-making involved.

from Built from the Greek 'tropos,' meaning 'a turning,' the same root that gives us 'trophy' (originally a monument marking the turning point where an enemy fled) and 'trope' (a turn of phrase). Scientists in the 19th century reached for this old word for 'turning' to name the slow, silent swiveling of stems toward sunlight — borrowing the language of combat and rhetoric to describe a plant quietly angling for the view.