BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Auxins function primarily in stem elongation by promoting cell growth. Indole-3-acetic acid (IAA) is the major naturally occurring auxin and one of the major growth factors in plants. They were the first group of plant growth hormones discovered.

Detailed explanation-2: -So, the correct answer is ‘Auxin’.

Detailed explanation-3: -Gibberellins promote flowering of arabidopsis by activating the LEAFY promoter. Plant Cell.

Detailed explanation-4: -The plant hormone gibberellin (GA) controls major aspects of plant growth such as germination, elongation growth, flower development, and flowering time. In recent years, a number of studies have revealed less apparent roles for GA in a surprisingly broad set of developmental as well as cell biological processes.

Detailed explanation-5: -It inhibits flowering of short-day plants in inductive short-day photoperiods. I t will induce stem growth and, in long-day photoperiods but possibly not in short days, flowering in cold-requiring biennial long-day plants.