Which hormone stimulates formation of lateral and adventitious roots?

Auxins are plant growth regulators that are widely used in agriculture and horticulture. They help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins also stimulate the formation of lateral and adventitious roots.

Gibberellins are primarily involved in stem elongation and seed germination.

Cytokinins promote cell division and shoot formation.

Ethylene is a gaseous hormone that promotes senescence and fruit ripening.

Answer: Auxins