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Tropism
A movement of a plant towards or away from a stimulus.
Phototropism
A movement towards or away from light.
Geotropism
A movement towards or away from gravity.
Hydrotropism
A movement towards or away from water.
Positive phototropism
Growth towards a source of light.
Negative geotropism
Growth away from the force of gravity.
Auxins
Plant hormones that control the growth rate of plant cells.
Indoleacetic acid (IAA)
A type of auxin that causes cells to elongate.
Positive geotropism
Growth towards gravity.
Negative phototropism
Growth away from light.