Presentation on theme: "carbon dioxide + water glucose + oxygen"— Presentation transcript:
1 carbon dioxide + water glucose + oxygen PhotosynthesisProcess plants utilise to produce their own foodTake in: water and carbon dioxideProduce: oxygen and glucose(light energy)carbon dioxide + water glucose + oxygen(chlorophyll)(light energy)6CO2 + 6H2O C6H12O6 + 6O2(chlorophyll)
2 But how does it all happen? First: look at the leaf structure.....
4 Light-dependent reaction: -light energy converted to chemical energy 6CO2 + 6H2O C6H12O6 + 6O2(chlorophyll)Light-dependent reaction:-light energy converted to chemical energy-water split into oxygen and hydrogensunlightH2OH+Light-independent reaction: hydrogen from water and carbon dioxide react to form glucoseC6H12O6CO2O2
5 How do plants use glucose? Convert into cellulose for growthConvert to other sugars to transport to other parts of the plantTo produce oils and proteinsConvert to starch for temporary storage in the leaf (on sunny days when photosynthesis rate is very high)Convert back into energy via respiration
8 Photosynthesis v respiration What determines the rate of a plant’s respiration and photosynthesis?ConditionsPhotosynthesis v respirationOverall resultDarkRespirationNo photosynthesisOxygen taken inCarbon dioxide given outDim lightPhotosynthesis rate equals respiration rateNeither gas is taken in or given out as each cancels the other outBright lightPhotosynthesis rate greater than respiration rateCarbon dioxide taken inOxygen given out