IGCSE›Edexcel IGCSE Biology›Mind mapsFood ProductionEdexcel IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsGlasshousesTrap heat, raising temperatureExtra CO2 removes a limiting factorBoth raise the rate of photosynthesisProtect crops from wind, pests and frostToo hot denatures enzymes, yield fallsFertilisers and pestsFertiliser adds mineral ions like nitratePesticides are fast but harm non-target speciesPests may evolve resistance to pesticidesBiological control uses a predator or parasiteBiological control is slower but sustainableYeastSingle-celled fungusRespires anaerobicallyglucose→ethanol+COX2\ce{glucose -> ethanol + CO2}glucoseethanol+COX2CO2 makes the dough riseEthanol evaporates during bakingFood productionraising yieldYoghurtLactobacillus respires anaerobicallyTurns lactose into lactic acidLower pH coagulates milk proteinsGives sour taste and thick textureFermentersAseptic precautions prevent contaminationContinuous nutrient supplyOptimum temperature and pHOxygenation for aerobic organismsAgitation keeps conditions uniformFish farmingMaintain water quality and remove wasteControl predation with nets or cagesControl disease by limiting stocking densityControl feedingSelective breeding for fast growth