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Which of the following hormone promotes bolting?

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in Biology – Class 11 by (272k points)
Which of the following hormone promotes bolting?

(a) GA

(b) Ethylene

(c) Auxin

(d) Kinetin

The question was posed to me at a job interview.

Question is from Growth Regulators in Plants in portion Plant Growth and Development of Biology – Class 11

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Correct choice is (a) GA

For explanation I would say: Bolting is the elongation of internode just prior to flowering. It is seen in plants with rosette habit. GA promotes the action of bolting. Ethylene helps rapid internode elongation in deep-water seedlings of rice. Auxin promotes rooting in stems. Kinetin promotes shooting in stems.

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