Tropic movement is the directional movement of a plant part in response to a specific external stimulus.
Explanation
Tropic movements are growth-dependent movements in plants where the direction of the movement is either towards the stimulus (positive tropism) or away from the stimulus (negative tropism).
Example: Phototropism
Phototropism is the movement of a plant in response to light.
- A plant’s shoot system typically grows towards the light source, exhibiting positive phototropism.
- The root system generally grows away from light, exhibiting negative phototropism.
Other examples of tropic movements include geotropism (response to gravity), hydrotropism (response to water), chemotropism (response to chemicals), and thigmotropism (response to touch).
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