Avena coleoptile test detects the presence of

Step-by-step solution

Avena curvature test carried out by F.W. Went demonstrated the effect of auxins on plant growth by performing some experiments with the oat ( Avena sativa ) coleoptile. IAA is the natural auxin. Auxins (Gk. auxin = to grow) are weakly acidic growth hormones having an unsaturated ring structure and capable of promoting cell elongation, especially of shoots.