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Which one of the plant growth regulators would you use if you are asked to :

(a) Induce rooting in a twig
(b) quickly ripen a fruit
(c) delay leaf senescence
(d) induce growth in axilliary buds
(e) ‘bolt’ a rosestte plant.
(f) induce immediate stomatal closure in leaves.

Answer
(a) Indole-3 butyric acid (Auxin)
(b) Ethylene
(c) Cytokinin
(d) Cytokinins
(e) Gibberellins
(f) Abscissic acid (ABA)