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Tropism
Thigmotropism- The growth of a living organism in response to touch/contact.
Hydrotropism- The growth of a living organism in response to water.
Thermotropism- The tendency of plant or other organisms to bend toward or away from heat.
Chemotropism- Movement caused by chemical stimulus in organisms such as bacteria and plants.

Thigmotropism

Hydrotropism

Thermotropism
