Assertion:Energy flow in food chains is always unidirectional.
Reason:Only 10% energy is transferred to the next trophic level.
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Answer:
the assertion and the reason are both correct but the reason is not appropriate for the assertion.
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The flow of energy in an ecosystem is said to be unidirectional because some energy is lost in form of heat when moving from one trophic level to next for the maintenance of homeostasis of an organism thus each successive trophic level receive a less amount of energy as compared to the preceding trophic level.
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