• Crop physiology refers to “Science of how plants develop, grow, and respond to their environment at the cellular & biochemical level”.
• Plant physiology is the study of:

a) the functions and processes occurring in plants

b) the vital processes occurring in plants

c) how plants work

• In essence, plant physiology is a study of the plant way of life, which include various aspects of the plant lifestyle and survival including: metabolism, water relations, mineral nutrition, development, movement, irritability (response to the environment), organization, growth, and transport processes.
• Plant physiology is a subdiscipline of botany concerned with the functioning, or physiology, of plants.
• Julius von Sachs (October 2, 1832 – May 29, 1897) is considered as the father of Plant Physiology.