The phenomenon of phototropism in plants is mediated by which hormone?

Phototropism, the growth of a plant organ towards or away from a light stimulus, is primarily mediated by auxin. Unequal distribution of auxin in response to light causes differential growth, leading to bending.

• Ethylene is involved in fruit ripening and senescence.
• Gibberellins are involved in stem elongation but are not the primary hormone for phototropism.
• Cytokinins are involved in cell division.