Explain Food Chain (with figure)

All the living organisms require energy in form of food for their survival. For this, they depend on each other. The producers synthesise food in the presence of sunlight and chlorophyll, for themselves as well as for others. First order consumers, which are herbivores, consume the producers to gain energy. They, in turn are consumed by second order consumers, which are carnivorous. Thus, there is a linear arrangement of organisms at different trophic levels, indicating the flow of energy in one ecosystem. This is called a Food Chain.