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Answer:

The flow of energy in food chain in unidirectional because the sun is the only source of energy for all ecosystems on earth. Then the energy is captured by the autotrophs does not revert back to the sun. Therefore, in the food chain, the energy moves progressively through various trophic levels.

Explanation:

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Answer:

plant use sunlight as a source of energy and do photosynthesis then primary consumer(herbivores) consume plant as food (energy) to do metabolic activities and then herbivores are consumed by carnivores.

In this way energy decrease at each successive tropic level. so we can say that energy flow is always unidirectional (from lower tropic level to higher)