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. Auxins serve dual roles in plants depending on where they are produced.

Detailed explanation-2: -Ethylene promotes the elongation of internodes in deep-water rice plants so that the leaves and upper parts of the plant remain above water.

Detailed explanation-3: -Gibberellins: stem, fruit, and seed growth Gibberellins (GAs) are a group of about 125 closely related plant hormones that stimulate shoot elongation, seed germination, and fruit and flower maturation.

Detailed explanation-4: -Gibberellins promote flowering of arabidopsis by activating the LEAFY promoter. Plant Cell.