What is the direction of flow of energy in an ecosystem?

What is the direction of flow of energy in an ecosystem?
[A]Unidirectional
[B]Bidirectional
[C]Multidirectional
[D]Cyclic

Unidirectional
The energy enters the plants from the sun through the photosynthesis process. This energy is then passed on from one organism to another in a food chain. The flow of energy in the ecosystem is unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis. During the transfer of energy through successive trophic levels in an ecosystem, there is a loss of energy all along the path.

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