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TROPISM:
Movement of a plant toward or away from a stimulus.
Positive Tropism - moving toward a stimulus
Negative Tropism - moving away from a stimulus
The term ‘hydrotropism’ is a combination of two words, ‘hydro’ and ‘tropism’. Here, ‘hydro ‘means ‘water’, and ‘tropism’ stands for ‘tropic movement’. Tropic movement is a directional movement displayed by a plant in response to any external stimuli, such as light, gravity, chemical, touch, temperature, and water. In this case, the external stimulus is water or moisture.
Example: The movement of plant roots towards water.
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