Optimum conditions for Photosynthesis 0.0 / 5 ? BiologyCellular processesA2/A-levelOCR Created by: HollyCreated on: 29-04-14 12:17 What are the 3 optimum conditions for photosyntheis? Light intensity, Co2 levels, Temperature 1 of 26 Why is light intensity an optimum condition? HIgh LI means more energy absorbed 2 of 26 What are the 3 pigments in photosystems? Chlorphyll a, Chlorophyll b, Carotene 3 of 26 What wavelength (colour) do these pigments absorb? a - red, b - blue, Carotene - green 4 of 26 What light (colour) do they reflect? a & b - green, Carotene - red 5 of 26 What is the opimum temperature required? 25 degrees 6 of 26 Why is temperature an optimum condition? Due to enzymes and level of activity 7 of 26 What happens to enzymes when temp is too low? Below 10 degrees - INACTIVE 8 of 26 What happens to enzymes when temp is too high? Above 45 degrees - DENATURED 9 of 26 What happens to the stomata? Stomata closes to avoid losing water, less Co2 can enter leaf 10 of 26 What is the optimum Co2 concentration? 0.4% 11 of 26 What is the normal Co2 concentration of the atmosphere? 0.04% 12 of 26 Why is Co2 an optimum condition? Required for calvin cycle. At optimum then enough Co2 can enter so the Calvin cycle can take place. 13 of 26 What happens if the Co2 concentration rises above optimum? The stomata close to prevent more from entering 14 of 26 What is a limiting factor? A factor that prevents photosynthesis from working at its fastest rate 15 of 26 How is low Light intensity a limiting factor? Light dependent stage can't make its products required for Calvin cycle 16 of 26 What are these products? ATP and reduced NADP 17 of 26 What happens if they aren't available? Conversion of TP to GP and GP to RUBP is slow 18 of 26 What will happen to the level of RuBP, GP and TP? RuBP - fall GP- rise TP - fall 19 of 26 How is Co2 a limiting factor? No Co2 entering the leaf means none to combine with RuBP to create GP 20 of 26 What happens to the conversion rate? Slows down 21 of 26 What will happen to the levels of RuBP, GP and TP RuBP - rise, GP & TP - fall 22 of 26 How is temperature a limiting factor? All reactions catalysed by enzymes 23 of 26 What happens in low temperatures? Enzymes are inactive so reactions will be slower 24 of 26 What happens in higher temperatures? Enzymes become dentaured so don't function 25 of 26 What happens to the levels of RuBP, GP and TP? All fall 26 of 26
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