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Topic 28Biology

C4.2 Transfers of energy and matter

Trophic levels and food webs, energy pyramids and Lindeman's 10% rule, biogeochemical cycles (carbon, nitrogen, water), GPP vs NPP, and global productivity patterns.

Practice questions
1

Trophic levels and food websSign up

Producers, consumers, decomposers · Food webs and energy pyramids (10% rule)

30 min
2

Biogeochemical cycles (C, N, water)Sign up

Carbon cycle reservoirs and fluxes (incl. anthropogenic) · Nitrogen cycle (4 bacterial steps) and water cycle

30 min
3

Productivity and ecosystem efficiencySign up

GPP vs NPP · 10% rule and global NPP variation

30 min