The five most important chemicals or phytohormones that are produced by plants to facilitate various functions are as follows: 1. Auxins 2. Cytokinins 3. Gibberellins 4. Ethylene 5. Abscisic Acid. Phytohormone # 1. Auxins: Auxin, indole-3-acetic acid (IAA), was the first plant hormone identified. It is produced primarily in the shoot tips and in developing […]