IB ESS 2.2.11 Food chains & trophic levels

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026

Practise tracing energy and carbon through trophic levels, with pollutant examples showing how toxins move and concentrate in food chains.

How this is tested

explain bioaccumulation and biomagnification from DDT, lead or POP food-chain data
use trophic position to justify why top carnivores carry high toxin concentrations

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