Explain unidirectional flow of energy.

There is unidirectional flow of energy in an ecosystem from the sun to producers to consumers and finally to decomposers. As per scientists, only 10 percent of the energy stored by producers is passed on to primary consumers. Similarly, a secondary consumer that eats primary consumer absorbs only 10 percent of its energy. Thus, the amount of energy that is transferred decreases at each level and the flow of energy is always in one direction only.