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(C) According to the $10\%$ law of energy transfer in an ecosystem,only $10\%$ of the energy available at one trophic level is transferred to the next

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$100$

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(C) According to the $10\%$ law of energy transfer in an ecosystem,only $10\%$ of the energy available at one trophic level is transferred to the next trophic level.$1$. The first trophic level (producers/plants) receives $10000 \ J$ of energy.$2$. The second trophic level (primary consumers) receives $10\%$ of $10000 \ J$,which is $1000 \ J$.$3$. The third trophic level (secondary consumers) receives $10\%$ of $1000 \ J$,which is $100 \ J$.Therefore,the energy available at the third trophic level is $100 \ J$.

$A$ plant receives $10000 \ J$ of energy from the sun. The amount of energy that will be present at the third trophic level is $:-$ (in $J$)

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