What is the function of rooting hormone like IBA when used on cuttings?

• A. To prevent disease in cuttings.
• B. To strengthen stem strength only.
• C. To promote root initiation on cuttings.
• D. To convert cuttings into seeds.

Answer: (C)

Rooting hormones like IBA act as auxins to trigger root formation in cuttings. When a cutting is taken, the base can be slow to start roots, especially in species that root poorly. Applying IBA supplies a stronger hormonal signal at the cut end, promoting the de-differentiation of cells near the wound and the development of root primordia. This speeds up rooting and increases the likelihood of successful root formation. It is not meant to prevent disease, strengthen stems, or convert cuttings into seeds—the primary job of IBA is to initiate roots.