Plant responses to signals — A/L Biology

A. Plant Hormones (Phytohormones) Definition: Chemical messengers produced in specific plant tissues that regulate growth, development, and responses to environmental stimuli. Explanation: Plant hormones are organic compounds synthesized in minute quantities that coordinate various physiological processes. They act as chemical signals that travel from their site of production to target cells, where they trigger specific responses. Different hormones have distinct functions - some promote growth while others inhibit it, and they often work in complex interactions rather than isolation. Understanding these hormones is crucial because they control everything from seed germination to flowering and fruit ripening. Think of it as: Think of plant hormones like a company's management team - each manager (hormone) has specific responsibilities (growth, stress response, flowering), and they communicate with different departments (plant tissues) to coordinate the company's overall operations.