Tropism

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Tropism is the movement of an organism (usually a plant, but the term is also used for lower animals) towards an external stimulus. In the picture above, the plants have bent forward out of the shade of my roof and into the sunlight (phototropism). Plants also prefer to grow against gravity, so if a plant is planted upside down, it will eventually bend upwards. Other examples of tropism include growing towards specific chemicals, water, or an electrical current.

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