IB ESS 2.2.28 (HL) Ecological efficiency

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026

Practise calculating and interpreting ecological efficiency between trophic levels in food chains and energy-flow diagrams.

How this is tested

calculate ecological efficiency from energy received and passed to the next trophic level
interpret why efficiency varies between ecosystems, trophic levels or species

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