the root system grows downwards in response to geotropism or phototropism
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Stem response to light is positive phototropism (grows towards the light). Root response to gravity is positive geotropism (grows in the direction of the force of gravity).
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(a) The roots of a plant always grow downwards in response to gravity. This phenomenon is known as geotropism.
(b) The stem of a plant grows upwards in response to light. This phenomenon is known as phototropism.
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