Steps in Plant Physiology Basic Concepts is a eighth project of the plant sciences. Botanical knowledge enhances our understanding and appreciation of our world and improves the quality of many people's lives. The basic knowledge of plant physiology, that is necessary for experts in agriculture. Most common processes of plant physiology such as Photosynthesis, Respiration, Nitrogen Fixation, Bio-Fertilizer, Plant Hormones and Enzymes are highlighted. The basic concepts of plant stress is complemented with the presentation of physiological mechanisms against different environmental stresses.Plant growth and development is introduced with the characterization and commercial use of plant growth regulators (PGRS, plant hormones). The present reference book will fulfill the basic needs of students, researchers and academicians.