Question

Growth hormone acts ______.

Options

• always as growth promoters.

• always as growth inhibitors.

• some as promoters and some as inhibitors.

• rarely as growth inducers.

Answer 1

Growth hormone acts some as promoters and some as inhibitors.

Explanation:

Plant growth hormones (phytohormones) are broad regulators categorised into two functional groups based on their primary effects. Hormones like auxins, gibberellins, and cytokinins act predominantly as growth promoters by stimulating cell division, elongation, and tissue differentiation. Conversely, hormones such as abscisic acid (ABA) and ethylene function primarily as growth inhibitors, regulating stress responses, dormancy, leaf abscission, and fruit ripening.