IB ESS 2.2.5 Producers
IB ESS 2.2.5 Producers

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise recognising producers as the first trophic level and explaining how autotrophs make biomass that supports food chains.
How this is tested
- state producer trophic level from a food-web figure or named ecosystem
- describe how plants, algae or photosynthetic bacteria convert light into biomass
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