One of these chemicals forms through the Yang Cycle and is thought to be co
One of these chemicals forms through the Yang Cycle and is thought to be connected to the hyponastic response.  The balance between two types of these compounds determines the differentiation of parenchyma cells, and Kurosawa discovered a type with an ent-kaurene precursor responsible for bakanae. Different members of this group are famous for promoting apical dominance, cell differentiation, phototropism, stem elongation, and flowering. For 10 points, name this class of signaling molecules including auxins, cytokinins, and gibberellins, responsible for inducing physiological processes in plants.
One of these chemicals forms through the Yang Cycle and is thought to be connected to the hyponastic response.  
plant hormones [Accept ethylene before differentiation of parenchyma cells, accept equivalents.]