Question

How does Auxin bend of plants?

Answer 1

so brother...auxin are released at the shady part of the plant and then quickly divide the cells in that area creating the stem to bend towards the bright part.

Answer 2

auxin is a plant growth hormone which get increase their number on the shadow side of plant top stem ( here the sunlight did not reach ) which lead to the growth of plant from only one side , that seems to bend of the plant toward sun..