Plant Hormones Can Have Different Effects at Different Concentrations

Multiple Choice

Plant hormones can have different effects at different concentrations. This explains how

A) some plants are long-day plants and others are short-day plants.
B) signal transduction pathways in plants are different from those in animals.
C) plant genes recognize pathogen genes.
D) auxin can stimulate cell elongation in apical meristems, yet will inhibit the growth of axillary buds.
E) they really don't fit the definition of "hormone."