GCEBiologyEcology2020

In a grassland ecosystem in Nigeria, grass is eaten by grasshoppers, which are eaten by lizards, which are eaten by hawks. If the grass contains 10,000 kJ of energy, how much energy is available to the lizards, assuming a 10% transfer efficiency at each trophic level?

A1000 kJ
B100 kJCORRECT
C10 kJ
D1 kJ
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Why the answer is B, and why the others tempt you.
Using the 10% rule of energy transfer: grasshoppers receive 10% of 10,000 kJ = 1,000 kJ, and lizards receive 10% of 1,000 kJ = 100 kJ. Option A is the energy at the grasshopper level, Option C is the energy at the hawk level, and Option D is an over-reduction error.
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