The growth or bending of an organism or part of an organism in response to chemical stimuli.
From chemi- (chemistry) + -tropism (from Greek tropos, turning, + -ism, a condition or process). This term emerged in plant physiology in the late 19th century.
Chemiotropism explains why plant roots grow downward toward minerals and why they turn toward nutrients in soil—it's a form of plant 'decision-making' that happens without a brain!
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