Multiple choice

In a food chain, what percentage of energy is passed up at each level?

  1. 20

  2. 40

  3. 10

  4. 20
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ten percent rule in ecology states that only about 10% of the energy at one trophic level is transferred to the next level. The remaining 90% of energy is lost as heat, used for metabolic processes, or remains undigested. Note that options A and D are duplicates, but C is the correct answer.

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