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geotropism
gravitropism
hydrotropism
phototropism
thigmotropism
tropism

This is the growth or movement of a organism (usually a plant), in response to a stimulus.

This refers to a plant whose roots grow down into the soil as a response to gravity.

This is a plants response to gravity.

This is when a plant grows towards water. Most of the time, it is the plant's roots that grow towards water since water is absorbed by the roots.

This is a plant response to light.

This is a plant response to contact with solid objects. Plant parts grow on or around things.