How does phototropism occur in plants ?

solution:
The response of a plant towards light is called as phototropism. If the plant part moves towards light, it is called positive phototropism. however, if the plant part moves away from light, then it is called negative phototropism.

The stem (or shoot) of a growing plant bends towards light, so the stem (or shoot) of plant shows positive phototropism. On the other hand, the roots of a plant move away from light, so the roots of a plant show negative phototropism.