Class 11 NEET Biology Plant Growth and Development

Concept:Gibberellins are plant hormones that promote stem elongation, especially the rapid internode growth (bolting) in rosette plants like cabbage before flowering.Explanation:In cabbage, the stage of internode elongation prior to flowering is called bolting.Gibberellin stimulates both cell division and cell elongation in the stem internodes, causing them to lengthen.This hormonal effect is specific to gibberellins and is used in agriculture to induce bolting in biennials.Other options: Ethephon releases ethylene (fruit ripening); Abscisic acid inhibits growth and promotes dormancy; Indole butyric acid is an auxin used mainly for rooting cuttings.Only gibberellin correctly matches the described function.Answer:C. Gibberellin