Rapid and dramatic increase in shoot length is called
a)	Triple response growth	b)	Bolting
c)	scarification	d)	Night break effect

(b)

Rapid and dramatic increase in shoot length is called bolting. Gibberellins induce stem elongation in ‘rosette plants’. E.g., cabbage, henane, etc, such plants show retarded internodal growth and profuse leaf development. In these plants, just prior to the reproductive phase, the internodes elongate enormously causing a marked increase in stem height, i.e., bolting.