Read the following physiological effects observed in plants: (i) Breaks seed and bud dormancy (ii) Initiates germination in peanut seeds (iii) Promotes sprouting of potato tubers (iv) Promotes rapid internode or petiole elongation in deep water rice plants Which of the following plant growth regulators is responsible for all the above effects?

Step-by-step solution

Ethylene is a gaseous plant growth regulator that performs all the listed functions. While Gibberellic acid is generally associated with breaking dormancy and internode elongation, the specific examples of initiating germination in peanut seeds, sprouting of potato tubers, and rapid internode or petiole elongation in deep water rice plants are characteristic physiological effects of Ethylene as per NCERT. Auxins are primarily involved in apical dominance and root initiation, while Cytokinins promote cell division a