Plant hormones are a group of signaling molecules that regulate essential physiological processes within plants. These endogenous chemicals mediate complex developmental cycles, including seed germination, cell elongation, and overall growth patterns. Specific types of plant hormones are responsible for mediating responses to environmental stressors, such as drought or temperature fluctuations, and govern processes like phototropism and dormancy. By influencing gene expression and cellular division, these hormones ensure that plant structures and life cycles are properly synchronized with available environmental conditions.