LIFE SCIENCE

Detailed explanation-1: -Based on several lines of evidence, including the rapid growth response during gravitropism and phototropism, auxin is also a major factor controlling internode elongation (Cleland, 2010).

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 promote growth in different ways. These hormones are mainly involved in controlling and promoting stem elongation, flowering, and leaf expansion as well as seed germination. They are used in suspension cultures to enhance the growth of cells.