April 8th 2015
Lab Report: Respiration
The objective of this lab was to figure out which has a higher cell respiration rate between crayfish and elodea. In order to figure this out we first set up three beakers to represent our control, elodea and crayfish and filled them with 75mL of culture solution which were dechlorinated making the solution acidic. We then had to place both the elodea and the crayfish in separate beakers filled with 25mL of water. The increase in volume of the water would represent the volume of the two test subjects. We then covered each beaker with plastic, but for the elodea we placed it under a can so it could be in the dark. After waiting 15 minutes to allow them to respire we took it out and add four drops of phenolphthalein, which was also acidic, to both beakers. Once both beakers got their four drops we added drops of NaOH, which was a base, until the solution turned pink. Our results were that the respiration rate of the crayfish was higher than the elodea.
In order for animals to sustain life they need oxygen and to consume food making their waste is carbon dioxide and skat. Whereas in order for plants to sustain life they need carbon dioxide and photosynthesizes resulting in their waste is oxygen. To connect the cycle all living things respire which is the process in which an organism brakes down an organic molecules and the byproduct is energy. “Respiration also removes electrons from glucose” Vodopich 125. Some of this energy released is absorbed into the chemical adenosine triphosphate also known as ATP. This energy is then used in the organism to transport, create new compounds, reproduce, muscle movement and to remove waste. Photosynthesis is a process in which a plant produces food for itself. To do this the plant uses sun light to split water molecules and collect the energy into reduced carbon dioxide sugars. I believe crayfish will have the...
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