Which Type of Plant Hormone is Primarily Responsible for the Bending

Question

Which type of plant hormone is primarily responsible for the bending of a plant shoot toward light?
A) auxin
B) ethylene
C) systemin
D) brassinosteroid

Accepted Answer

Auxin is the plant hormone primarily responsible for phototropism, the bending of a plant shoot toward light. It promotes cell elongation on the darker side of the shoot, causing the plant to bend toward the light source.