IGCSE›Cambridge IGCSE Biology›Mind mapsFood Chains and Food WebsCambridge IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsFood chainShows energy transferAlways starts with a producerArrows point the way energy flowsGrass → caterpillar → blue tit → sparrowhawkFood webNetwork of linked food chainsOrganisms eat and are eaten by several speciesPredators: arrows leading awayPrey: arrows leading inFood chainsand food websRolesProducer makes its own nutrientsPrimary consumer eats producersSecondary consumer eats primary consumersHerbivore eats plants onlyCarnivore eats animals onlyDecomposer feeds on dead materialHuman impactOverharvesting removes species faster than they breedAffects every connected species in the webIntroduced species may lack predatorsCane toads: predators had no defenceExam tipsStart with the producerArrows show energy flow, not eating direction