Plant hormones are produced within plants as signal molecules, occur in very low concentrations. It controls all respect features of plant growth and development, from embryogenesis, organ size regulations, defense from pathogen to development of reproductive parts, each plant cell has ability to produce hormones.
Cytokinins are a class of phytohormones that promote cell division in roots as it promote RNA synthesis RNA and protein and enzyme activities in tissues is stimulated by it. There are two types of cytokinins that is adenine-type cytokinin which is represented by kinetin, zeatin, and phenylurea-type cytokinins like diphenylurea and thidiazuron. Mostly the adenine-type cytokinins are synthesized in roots.