LIFE SCIENCE

Detailed explanation-1: -The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants. A small proportion of this chemical energy is transformed directly into heat when compounds are broken down during respiration in plants.

Detailed explanation-2: -energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work-i.e., energy in the process of transfer from one body to another.

Detailed explanation-3: -The Sun in a food chain is the main source of energy. It is required in almost every food chain. Food chains include specific levels of organisms where energy can be transferred. Most food chains must begin with the Sun.