What is the term for the growth of plant roots downward in response to gravity?
Geotropism
Tropism is the directional growth of a plant part in response to an external stimulus. When the stimulus is gravity, the growth is called geotropism (also called gravitropism). Roots grow downwards in the direction of the pull of gravity, so they show positive geotropism, while shoots grow upwards, showing negative geotropism.
Phototropism is growth in response to light, hydrotropism is growth in response to water, and chemotropism is growth in response to a chemical stimulus. None of these describe the downward growth of roots caused by gravity.
Hence, the answer is Geotropism.
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