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Energy transfer is said to be unidirecti...

Energy transfer is said to be unidirectional where biochemical transfer is said to be cyclic? Why.

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The flow of energy is unidirectional because the energy lost as heat to the environment can.t be reutilized by plants for photosynthesis. Energy decrease at each tropic level (10% of previous level). Hence it can.t be reused again. Whereas biochemical transfer is cyclic because nutrients utilized by plants and animals are returned to environment after the death of organisms.
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