A food chain has 5000 kJ of energy in the producers. If 10% is transferred at each level, how much energy reaches the secondary consumers?

Answer and explanation

Correct answer: D. 50 kJ

  1. Step 1: Primary consumers: 10% of 5000 = 500 kJ.
  2. Step 2: Secondary consumers: 10% of 500 = 50 kJ.
Answer
50 kJ.
Why not the others: 500 kJ: this is the primary consumers' energy. 5 kJ: this is the tertiary consumers' energy. 100 kJ: this assumes 20%.

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