LIFE SCIENCE

Detailed explanation-1: -Bolting is induced by plant hormones of the gibberellin family, and can occur as a result of several factors, including changes in day-length, the prevalence of high temperatures at particular stages in a plant’s growth-cycle, and the existence of stresses such as insufficient water or minerals.

Detailed explanation-2: -The rapid stem elongation of rosette plant is called bolting. Bolting needs either long days or cold treatment. However, bolting can be induced artificially by the application of gibberellic acid under normal conditions. So, the correct answer is ‘Elongation of stem in rosette plants’

Detailed explanation-3: -Bolting is induced artificially by treating with the plant hormone gibberellin which is naturally found in the plants but can also be exogenously produced. The height of intermodal regions of the stem is increased by these gibberellins.