Tropisms orient plant growth toward or away from environmental stimuli. Plants sense and
Chapter 33, Problem 33.9(choose chapter or problem)
Tropisms orient plant growth toward or away from environmental stimuli. Plants sense and respond to environmental changes. Tropisms are growth responses that change the shape of a plant or make it grow toward or away from a stimulus. Phototropism, bending in response to light, may result from auxin moving from the light side to the dark side of a stem. A response to gravity, or gravitropism, may be caused by settling of organelles on the low sides of shoots and roots, which may trigger a change in hormone distribution. Thigmotropism, a response to touch, is responsible for coiling of tendrils and vines around objects.
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