Tropism

Isaiah Garza/1-31-14/5th

Tropism

involuntary orientation by an organism or one of its parts that involves turning or curving by movement or by differential growth and is a positive or negative response to a source of stimulation.

Geotropism

a tropism (as of plant roots) in which gravity is the orienting factor
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Hydrotropism

a tropism (as in plant roots) in which water or water vapor is the orienting factor
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Phototropism

a tropism in which light is the orienting stimulus
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Thigmotropism

a tropism in which contact especially with a solid or a rigid surface is the orienting factor
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