Answer:
The movement of a plant
in the direction of a stimulus or away from it is called tropic movement or
tropism. It is said to be positive if it is directed towards the source of stimulus
and negative if directed away from the source stimulus. e.g., geotropism, the
tropic respose towards gravity. When a growing portion of a plant is placed
horizontally, the stem tip grows away from the pull of gravity. While the root
tip grows towards it. Thus, the stem is said to be negatively geotropic and the
root positively geotropic.
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