Phototropism

Light produces phototropism, while gravity produces gravitropism (also called geotropism). Shoots commonly grow towards light, where their leaves can receive light for photosynthesis. Roots commonly grow downwards, helping them reach water and minerals and anchor the plant.

Roots generally show negative phototropism, growing away from light.

Light produces a phototropism, while gravity produces a gravitropism. These responses help shoots reach light for photosynthesis and roots grow into soil, where they anchor the plant and absorb water and mineral ions.

A shoot normally shows positive phototropism, meaning that it grows towards light. With light arriving from one side, more auxin accumulates on the shaded side of the shoot. The cells on that side elongate more than those on the illuminated side.