Having learnt about the energy requirements (supplement) of a single individual organism, we will now focus our attention on the energy production and utilization of ecosystem. Such a study is important as all the organisms obtain their energy requirements from the food available in the habits they live. The organisms and its habitat are parts of ecosystem. In other words, energy in the form of food must be available to the organism in ecosystem. This is possible only when the energy (food) is produced in the ecosystem. Therefore, it is important to study the production and utilization of energy in ecosystem.