1. abscisic acid chemicals produced by plants that stimulate stem elongation, seed germination, and flowering 2. auxins hormone that promotes ripening of fruit or blooming of flowers 3. cytokinins chemicals produced in plants that are characterized by their ability to induce cell elongation and cell division in stems 4. ethylene chemicals that plant cells divide 5. gibberellins hormone that regulates survival functions of a plant, such as the opening and closing of stomata