BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Final answer: Cytokinin is a plant growth regulator hormone.

Detailed explanation-2: -It has been recognized that cytokinins are plant hormones that influence not only numerous aspects of plant growth, development and physiology, including cell division, chloroplast differentiation and delay of senescence but the interaction with other organisms, including pathogens.

Detailed explanation-3: -Cytokinin is a plant hormone. Insulin is an animal hormone. Oestrogen is an animal hormone. Cytokinins promote cell division, and are present in greater concentration in areas of rapid cell division, such as in fruits and seeds.

Detailed explanation-4: -There are two types of cytokinins: adenine-type cytokinins represented by kinetin, zeatin, and 6-benzylaminopurine, and phenylurea-type cytokinins like diphenylurea and thidiazuron (TDZ). Most adenine-type cytokinins are synthesized in roots. Cambium and other actively dividing tissues also synthesize cytokinins.

Detailed explanation-5: -Plant hormones are chemical compounds present in very low concentration in plants. They are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid) and gases (Ethylene).