How can we say that flow of energy is unidirectional

1.	How can we say that flow of energy is unidirectional
Answer» Energy is passed from one trophic level to succeeding trophic level. It will never come back from succeeding trophic level to previous one. For example, energy from Sun once passed to plants than it can\'t return back to sun in form of light energy. The flow of energy in the ecosystem is unidirectional (or one-directional). The energy enters the plants (from the sun) through photosynthesis during the making of food. This energy is then passed on from one organism to another in a food chain.Energy given out by the organisms as heat is lost to the environment, it does not return to be used by the plants again. This makes the flow of energy in ecosystem \'unidirectional \'. Thus, the flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesisThumbs up please...!!!

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