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Comparing rate of photosynthesis Natalie Loo 12A Aim: To compare two methods used to measure the rate of photosynthesis Diagram: Please see the attached sheet Results: Method 1- Disc Time taken for each disc to rise/s Rate/s-1 1 0 0.0000000 2 345 0.0028985 3 346 0.0028901 4 464 0.0021552 5 502 0.0019920 6 540 0.0018519 7 573 0.0017452 8 574 0.0017422 9 579 0.0017271 10 584 0.0017123 11 585 0.0017094 12 624 0.0016026 13 626 0.0015974 14 680 0.0014706 15 680 0.0014706 16 681 0.0014684 17 681 0.0014684 18 700 0.0014286 19 700 0.0014286 20 782 0.0012788 Method 2- Trail Column of gas/cm Time/s Rate/cm s-1 1 1.60 300 0.0053333 2 1.50 300 0.0050000 3 1.90 300 0.0063333 4 2.00 300 0.0066667 5 1.40 300 0.0046667 Average 1.68 300 0.0056000 Conclusion and Evaluation: Looking at the results, method 2 seemed to be a better method for measuring photosynthesis, since the average rate in method 2 is higher than the ones being measured in method 1. However, we have to bear in mind that two different types of plants have been used. In method 1 a dry or in other words a land plant was used and in method 2 a water plant was used. The plant type has an effect on the rate of photosynthesis. Considering the inaccuracy of the techniques, the meniscus might be misread in both methods; the timing for both methods might also be inaccurate. In method 1, the transfer of the discs into...

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