The present book entitled "Genetical and Physiological Study of Spring Wheat" has been prepared for B.Sc. Ag. (Hons) students who are interested to study genetic variation, heterosis, heritability, genetic advance and physiology of spring wheat. The primary objectives for preparing this text is to enrich our knowledge about plant physiology and different genetic parameters related to yield. An attempt has been made to present the text in a simple language. Tables have been used to make the text easily understanable. I hope that the agregate information compiled in this book will be helpful for the researchers.