A differential elongation of cells that a plant organ exhibits in response to directed blue light is known as phototropism.
It allows the plant to optimize photosynthetic light collection in the aerial section while still acquiring water and nutrients in the roots.
It is of two types: positive and negative phototropism.
Positive phototropism:
The process of growing plants toward a light source is known as positive phototropism.
Positive phototropism is found in the shoot system, which includes the leaves, flowers, stems, lateral buds, and other elements that extend above the ground.