Which plant hormone is primarily responsible for cell elongation, apical dominance, and phototropism?

💡 Solution & Explanation

Auxins are primary plant hormones responsible for regulating cell elongation, directing phototropic growth responses, and enforcing apical dominance in shoots. Other hormones such as cytokinins promote cell division and delay leaf senescence, while gibberellins stimulate stem elongation and seed germination. These phytohormones act at very low concentrations to coordinate complex developmental programs.