Cellular Respiration Lab Report

Length: 2 Pages 580 Words

Introduction This lab was done to determine the relationship of gas production to respiration rate. Justin Pyka and I did the lab on December 12th, 2000 in Mr. Myers’ room. The lab was done with dormant pea seeds and germinating pea seeds. It was done to test the effect of temperature on the rate of cellular respiration in ungerminated versus germinating seeds. We had to determine the change in gas volume in respirometers. This was done to determine how much oxygen was consumed during the experiment. The respirometers contained either germinating, or non-germinating pea seeds. I think that the germinating seeds will have a higher oxygen consumption rate in a room temperature water bath than the non-germinating seeds. My reason for this hypothesis is that a dormant seed would not have to go through respiration because it is not a plant yet. A ger Continue...

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Methods and MaterialsMaterials:Glass Vials1 mL Glass Pipette TubesRubber Stoppers264 Germinating Pea Seeds264 Dried Pea Seeds100 mL Graduated CylinderGlass BeadsAbsorbent CottonSolid KOHDry Cotton25 Degree C Distilled Water Bath10 Degree C Distilled Water BathRed Indicator (Safrin)Syringe With Needle on EndRubber StoppersMethods:See lab handout for methods of completing the experiment and recording the results. minating seed would consume more oxygen because it is growing, and therefore would need to consume oxygen by going through the process of! cellular respiration. The germinating seeds consumed almost no oxygen throughout the experiment in the 10-degree C water bath. This lab was a good representation of what effects temperature has on cellular processes because it showed that respiration slowed down when the temperature was reduced, and respiration increased when the temperature increased. Which means that the germinating seeds would slow down their respiration rates because of the colder temperature. The vials containing the dry seeds and glass beads had the same result. I think that this is because when an organism cools down, all of its cellular functions slow down. ConclusionAfter completing this experiment, I have come to the conclusion that a germinating seed of a plant consumes more oxygen than a dry seed of a plant. The germinating pea seeds consumed the most oxygen. ------------------------------------------------------------------------Bibliography. They consumed almost three times as much oxygen as the glass beads alone, and the glass beads and dry pea seeds. ResultsSee graphs for interpretation of results. I think that this is because the gas in the vials cooled, and when it cooled, it took up less space in the vial, therefore pulling the indicator down the respirometer tube, which would make it look like the contents in the vials consumed large amounts of oxygen. In the room temperature water bath, the glass beads, and the dry pea seeds and glass beads consumed the least amount of oxygen (see chart 1). Note: Two tests were done for each step.


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