Just like phototropism, gravitropism is also caused by an unequal distribution of auxin. When a stem is placed horizontally, the bottom side contains more auxin and grows more - causing the stem ...

This causes the stem to grow towards the light. It is vital to note that the plant does NOT bend towards the light. Auxins have the opposite effect in roots. This is negative phototropism.

A study at the University of Cordoba shows how algae produce auxin, a plant hormone, opening a path of communication with ...

A study at the University of Cordoba shows how algae produce auxin, a plant hormone, opening a path of communication with ...