What is a tropic movement? Explain with an example.

(N/A) Tropic movement is the directional growth movement of a plant part in response to an external stimulus. These movements are dependent on the direction of the stimulus and can be either towards the stimulus (positive tropism) or away from it (negative tropism).
For example,in phototropism,the shoot of a plant shows positive phototropism by bending towards the light source,whereas the roots show negative phototropism by growing away from the light.