Using the 10 percent rule, if producers fix 20000 kJ of energy, how much energy is available to secondary consumers?
Answer and explanation
Correct answer: B. 200 kJ
- Step 1: About 10 percent of the energy passes to the next level.
- Step 2: 20000 x (1/10)^2 = 200 kJ.
Answer
200 kJ.
Why not the others: 2000 kJ: one trophic level too few was used. 20 kJ: one trophic level too many was used. 4000 kJ: the percentages were added instead of multiplied.
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