Name five plant growth regulators and state one function of each.

Auxins promote cell elongation and apical dominance. Gibberellins promote stem elongation and break seed dormancy. Cytokinins promote cell division and delay senescence. Abscisic acid closes stomata and induces dormancy. Ethylene ripens fruit and promotes abscission.

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Explanation

The first three are chiefly growth promoters and the last two chiefly inhibitors, though ethylene does both.