Bahubali College of Engineering
Gommatanagar, Shravanabelagola 573 135, Hassan District(Karnataka)
(Approved by AICTE New Delhi, Affiliated to VTU, Belagavi and Recognised by Government of Karnataka)
Life on earth depends on the ow of energy from the thermonuclear reactions occurring at the
heart of sun. Thus energy for all biological processes ultimately comes from sun. Living cells
have complex and ef cient systems to change energy form one form to another, transforming
the radiant energy from the sun into the chemical and mechanical energy used by everything
that is alive. There are three major stages of energy transformation in the biological world.