This book contains information on a variety of topics related to “growth and development, including the method of action, physiological function, biosynthesis, and inactivation of auxins, ethylene, gibberellins, and abscisic acid. To ensure that readers are able to appreciate the intellectual intricacies contained in the book, it is written in a way that is concise and easy to understand. It includes fundamental processes such as photosynthesis, plant nutrition, plant hormone functions, respiration, photoperiodism, tropisms, nastic movements, photomorphogenesis, circadian rhythms, environmental stress physiology, seed germination, dormancy, and the function of stomata and transpiration, both of which are components of plant water relations. Plant physiology is a subject of botany that focuses on the study of how plants function, sometimes referred to as their physiology. The study of how plants operate is the primary emphasis of this topic. The information is laid out in a way that is clear and succinct, allowing readers to easily grasp the conceptual complexity that are being discussed. Students will get familiar with the fundamental idea of plant water connection and mineral nutrition after reading this book. They will have a better understanding of the many physiological processes, such as translocation photosynthesis, respiration, and nitrogen metabolism, as a result of reading this book. They will learn about a variety of fundamental metabolic processes as they are engaged in breathing. In addition to this, they will acquire knowledge about the structure, function, nomenclature, and assay of a variety of enzymes as well as plant growth regulators, including hormones.