Plant physiology is a discipline which studies the internal processes of plants and the factors influencing those processes. The study of this discipline has enabled mankind to develop new techniques and methods particularly useful for agriculture and horticulture. Mechanisms like photosynthesis, which take place at molecular levels to development of plants that occur at macro levels, many physiological mechanisms have been discussed in detail. The aim of this book is to provide apt references to graduate and post graduate students of biology and botany about various life processes like transpiration, germination, etc. This book traces the recent progresses in this field and will also be beneficial for research scholars.