Tropism

Science / Biology / Tropism: The movement of plant parts toward or away from a stimulus in the plants environment. Plant movement in response to an environmental stimulus.

Geotropism

Science / Biology / Geotropism: Plants response to gravity: roots grow downward, showing positive geotropism, while shoots grow upward in a negative response. MORE

Thigmotropism

Science / Biology / Thigmotropism: Plants response to contact with a solid object; e.g., tendrils twining around a pole. Plant response to touch. MORE

Phototropism

Science / Biology / Phototropism: The reaction of plants to light in which the plants bend toward the light. Plant response to light by unequal growth caused by concentration of the plant hormone Indole Acetic Acid (IAA, an auxin) on MORE

Auxins

Science / Biology / Auxins: A group of hormones involved in controlling plant growth and other functions; once thought responsible for phototropism by causing the cells on the shaded side of a plant to elongate, thereby causing MORE

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