Synopsis This comprehensive and stimulating text summarizes present scientific knowledge in Plant Physiology. It is an insightful compilation offering a comprehensive account of the fundamental principles of plant physiology. It incorporates and organizes the information concerning plant physiology from relevant and authentic sources. It is a humble attempt to present a connected and precise account of the subject matter of this important branch of Botany which forms an integral part of the studies undertaken by the undergraduate and postgraduate students of the subject. The principles have been outlined in considerable detail along with the fundamental facts and theories.