If the producers synthesise 20,000kcal of energy, how much energy approximately reaches the primary consumers? [2marks]
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Solution
As per the 10% rule, only 10% of the energy goes from one trophic level to the another. So, in this case 10% of 20,000kcal, i.e; 2,000kcal of energy is received by the primary consumers. [2marks]