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Bean Development Lab Purpose To study the relationship between time and weight changes in the cotyledons and embryos of the beans Materials Needed 30 Large or Small Bean Seeds Balance Paper Towel Rubber Band Water Large Beaker Lens Procedure The first step that needed to be taken was picking out the beans My lab partner and I decided to take 30 large beans and then brought them back to our desk Then we chose ten beans and broke them into two cotyledons and one embryo each After using our fingers to brake the ten beans in two we collected all the cotyledons and weighed them in grams on a balance We then did the same with the embryos Once their weight was recorded the 20 remaining beans were put on a paper towel in two rows of ten and then rolled up A rubber band was then put around the towel to secure the beans from walling and the paper towel was moistened with water to put it in a beaker with more water The beans were unraveled two days later and the same measurements were done with ten new beans The rest were wrapped up again and stored for another four days After being stored for six days in total the last ten beans were measured just like the other 20 Data DAYTOTAL COTYLEDONSPER COTYLEDONTOTAL EMBRYOSPER EMBRYO 01940 g97 g40 g04 g 21830 g915 g50 g05 g 61620 g81 g60 g06 g Conclusion 7 The general relationship between the change in weight of the cotyledons and of the embryos was not what I expected it to be Over the six days the weight of the cotyledons decreased while the weight of the embryos increased The cotyledon weight between day 0 and day 2 slightly decreased yet from day 2 to day 6 there was a greater decrease On the other hand the
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