Root Formation in Stem Cuttings Can Be Improved by the Application

Question

Root formation in stem cuttings can be improved by the application of ____.  
A) synthetic auxins
B) abscisic acid
C) salicylic acid
D) ethylene
E) gibberellin

Accepted Answer

Synthetic auxins such as indolebutyric acid (IBA) or naphthalene acetic acid (NAA) are commonly used to promote root formation in stem cuttings. They mimic the natural auxins produced by the plant, which play a critical role in root development. When applied to the base of stem cuttings, synthetic auxins can stimulate the cells to produce roots, leading to successful propagation of the plant.