IGCSE›Oxford AQA IGCSE Biology›Mind mapsPhotosynthesisOxford AQA IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhat it isLight absorbed by chlorophyll in chloroplastsFound in some plant cells and algaeCarbon dioxide + water → glucose + oxygen6 COX2+6 HX2O→CX6HX12OX6+6 OX2\ce{6CO2 + 6H2O -> C6H12O6 + 6O2}6COX2+6HX2OCX6HX12OX6+6OX2Oxygen is a by-productGetting reactantsCarbon dioxide from the airWater from the soil, via rootsCO₂ enters by diffusion through stomataPalisade mesophyll does most photosynthesisLimiting factorsLow temperatureShortage of carbon dioxideShortage of lightFactors interact, any one may limitPhotosynthesismaking food from lightCO₂H₂OO₂GreenhousesRaise temperature, CO₂ and lightHigher rate gives bigger yieldExtra cost must be worth the extra cropUses of glucoseRespiration for energyInsoluble starch for storageFat or oil for storageCellulose strengthens cell wallsProteins, with nitrate ions from soilExam tipsWrite word and symbol equationsName the limiting factor when a graph levels offPractical: count oxygen bubbles in a set timeChange one variable, control the rest