Progressing from general plant physiology to specific touch-induced responses, the book analyzes hydraulic mechanisms and the adaptive significance of this unique defense strategy against herbivores and reducing water loss, integrating molecular mechanisms with ecological consequences. This book uniquely combines electrophysiological recordings, microscopic imaging, and experimental studies. It provides a comprehensive overview suitable for students, researchers, and anyone interested in the remarkable abilities of plants, highlighting bio-inspired engineering applications and connections to plant neurobiology.