which one would give more roots growth; indole-3-butyric acid or gibberellic acid? why? explain me please?

Answer 1

IBA is a plant hormone in the auxin family and is an ingredient in many commercial plant rooting horticultural products.

Auxin induces new root formation by breaking root apical dominance induced by cytokinins. However, high concentrations of auxin inhibit root elongation and instead enhance adventitious root formation. Removal of the root tip can lead to inhibition of secondary root formation

Gibberellic acid is a simple gibberellin, involved in promotion of stem elongation, mobilization of food reserves in seeds and other processes.