Uses interactions between the plant and the environments as a foundation for developing plant physiology principles-light and plant development, temperature effects, etc. Discusses the role of plants on specific ecosystems and global ecology and provides information on the cell, chemical background, plant growth regulators and biochemistry. This revised edition features a new chapter on Molecules and Metabolism and expanded coverage in areas such as the role of carotenoids, biotechnology and significance of the role of molecular genetic approaches to the study of hormone action, photoperiodism, and other aspects of development.