Question

During phototropic curvature movement shown by plants, auxin accumulates on the illuminated side so that cells on the darker side divide more rapidly.

Answer 1

Phototropism is the phenomenon in which there is a growth response of plants towards the light. Due to phototropism, the plant shows curvature movement. Auxin is a plant hormone that is involved in phototropism. It is responsible for the cell elongation. When one side of the plant is illuminated by the light, the auxin accumulates on the shaded side of the plant. The cells on the darker side divide more rapidly due to auxin accumulation. This results in the bending of stem towards the light.