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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.