Question

The plant hormone that brings about phototropism is

Answer 1

$\huge\bold\red{Auxin}$

The plant hormone that brings about phototropism is$\underline\bold{Auxins}$

Phototropism is the growth of a plant toward a light source, resulting from the rapid elongation of cells on the dark side of the plant. The hormone that causes phototropism is auxin.

Answer 2

The plant hormone that brings about phototropism is Auxin .

When light falls on one side of a plant , the secretion of auxin hormone is more in the part away from the light . Hence , auxin causes growth in length of the cells in shady part . So the plant appears to bend towards light .