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Analysing Evidence and Drawing Conclusions - Photosynthesis  

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Skill Area O: Obtaining Evidence Distance from light (cm) Light intensity (lux) Rate of Photosynthesis (number of bubbles/minute) Average bubbles/min Temperature (0C) 1st 2nd 3rd (if needed) 70 147 12 7 7 7+7/2=7, 7 20 60 190 14 15 - 14+15/2=14.5, 15 20 50 240 21 20 - 21+20/2=20.5, 21 20 40 355 26 26 - 26+26/2, 26 20 30 609 28 29 - 28+29/2=28.5, 29 20 20 1359 36 36 - 36+36/2=36, 36 20 10 4780 44 40 42 40+42/2=41, 41 20 Secondary Data Distance from light (cm) Light intensity (lux) Rate of Photosynthesis (number of bubbles/minute) Average bubbles/min Temperature (0C) 1st 2nd 3rd (if needed) 70 20 0 0 - 0+0/2=0, 0 20 60 25 3 5 - 3+5/2=4, 4 20 50 35 8 12 - 8+12/2=10, 10 20 40 55 19 21 - 19+21/2=20, 20 20 30 90 32 32 - 32+32/2=32, 32 20 20 180 48 47 - 48+47/2=47.5, 48 20 10 440 50 49 - 50+49/2=49.5, 50 20 5 920 49 51 - 49+51/2=50, 50 20 Skill Area A: Analysing Evidence and Drawing Conclusions (Continued from graphs) Trend/Pattern The graphs show me that from A - B as the light intensity increases so does the rate of photosynthesis. However from B - C the rate of photosynthesis starts to level off. I think that if I'd done another measurement at 5cm the rate of photosynthesis would have levelled off completely. Secondary Data My secondary data is the results that another boy in my class got. From the graphs I can see that his graph of, the rate of photosynthesis against light intensity, backs my graph up very well as they both have a very...

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