Biology - Plant Biology - Advanced - Plant hormones - Major Plant Hormones
Five sections for key plant hormones. Section 1: 'AUXINS - Promote cell elongation. Control phototropism and gravitropism. Produced in shoot tips. Used commercially: rooting powder, weedkillers (synthetic auxins cause uncontrolled growth in weeds).' Section 2: 'GIBBERELLINS - Promote stem elongation