Which of the following is the best definition of ecological efficiency?
The ratio between energy flows at different points in a food chain
Options Analysis:
- The ratio between mass and energy flow → Incorrect (not about mass)
- The ratio between energy flows → Correct (matches standard definition)
- The amount of energy stored → Incorrect (about storage, not transfer efficiency)
- The amount of energy utilised → Incorrect (about usage, not transfer between levels)
Key Points:
- Ecological efficiency measures energy transfer between trophic levels
- Typically ranges from 5-20% in natural ecosystems
- Calculated as: (Energy at higher level/Energy at lower level) × 100
Correct Answer:
✔️ 2. The ratio between energy flows at different points in a food chain
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