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“Energy flow in a food chain is unidirectional”. Justify this statement.

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• Sun is the only source of energy. Producers convert solar energy into chemical energy in the form of food. 

• The primary consumers (herbivores) depends on producers for food. 

• According to the energy transfer law, only 10% of energy is transferred from one trophic level to the other. 

• Therefore, the energy that is captured by the producers does not come back to the Sun and the energy transferred to the herbivores does not come back to the producers. 

• It just keeps on moving to the next trophic level in a unidirectional way. 

• That is why the flow of energy in the food chain is always unidirectional.

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