Thursday, November 7, 2019

5th grade investigates chlorophyll

     Now that we are in fall, it is a perfect time to investigate why leaves change color. The 5th grade investigated this at the microscopic level this past week. We started by exploring two ways to do liquid chromatography. This process separated the different chlorophyll pigments using filter paper and rubbing alcohol.

     The first method we tried was lightly crushing leaves onto the paper using a coin. The second method examined crushing the leaves with a mortar and pestle in an alcohol solution and using a pipette to apply the solution to the filter paper. The results were made by direct observation and comparing each method to see which best separated the different types of chlorophyll on the filter paper. Results were pretty much evenly split and the reasons for why this happened were discussed in class.








       
     During the next class, we learned how to operate the compound light microscope so we could observe a green leaf segment and compare it to a red leaf segment. We started by observing fixed specimen slides to familiarize ourselves with proper microscope care and techniques. Then we compared the leaves and drew our observations on paper.















                                     


The Show Must Go On...even if for just one night!

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