The Effect of Caffeine 1% and 2% on Daphnia magna’s Heart Rate Abstract: Ectothermic animals are animals whose body temperature is affected by their surroundings. This means that if the environment is cold the animal will be cold. If the environment is warm the animal will be warm. This is because the animal doesn’t have the capability of regulating its body systems to keep a constant body temperature. When an ectothermic animal is cold‚ its heart rate will lower. When
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this experiment I aim to find out if caffeine has an effect on the heart rate of daphnia. Daphnia are water fleas that have a sort of heart that we can see in magnification. We can count the number of heart beats in a minute of a regular daphnia and try and get a new one with the same specifications as the old one that may have died. It is also a good idea to get a new one as we want to see how much it affects it from ordinary instead of adding the caffeine one after another. We have to be careful
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of Caffeine on Daphnia Heart Rate: Aim: To investigate the effect of caffeine on the heart rate in Daphnia. Hypothesis: My hypothesis is that as the caffeine content increases‚ the heart rate if the Daphnia increases. Equipment: * Culture of water flea – Daphnia * Caffeine of 5 different concentrations * Microscope * Counter * Cavity Slide * Pipettes * Stop clock * Distilled water * Test tubes * Petri dish Method: 1. Remove one Daphnia and
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toxins such as caffeine‚ nicotine‚ epinephrine‚ ethanol and salt have on the Daphnia magna’s heart rate Results The effect the various drugs caffeine‚ nicotine and epinephrine had on the Daphnia magna is displayed in Figure 1. After three sample trials were taken there was an average of 180 beats/min-1 ± 6.928 taken under normal conditions. The addition of caffeine caused an increase in the average heartbeat to change to 192 beats/min-1 ± 9.165 in the Daphnia magna tested. When testing the effect
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with the drug was 132 BPM. That is a change by -84 BPM. This proves that hemp lowered the heart rate of the Daphnia‚ like the hypothesis stated. The overall average for all the groups‚ there is a similar trend with a -7% change meaning the every test had the same outcome of the heart rate decreasing. There
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Daphnia‚ also known as the water flea are planktonic crustaceans that are found in lakes‚ ponds‚ and streams. They received “their common name from their jerky movement through the water” (Clare). They are also “very small‚ usually 2-5mm long‚ with an overall shape similar to a kidney bean” (Elenbaas). Daphnia play an important role in the freshwater food chains and serve as food for other freshwater organisms such as fish. They are also commonly used to test for chemical toxicity in water. Since
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the effect of different caffeine concentration on the heartbeat rate of Daphnia at room temperature. Introduction: Caffeine is found‚ and produced in many plant species to function as a natural pesticide‚ and as an inhibitor of seed germination of other nearby coffee seedlings to give it a better chance of survival. Caffeine is able to paralyze and kill certain insects upon feeding on the plants that produce caffeine. Coffee‚ tea and cocoa are common caffeine-containing plants widely
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belief agreed the significance of standardized testing was explained by Evers(2005)‚ the number of people who can master “language‚ business‚ academic‚ technological‚ and workplace skills”‚ are the milestones of (achieving) country’s persistent development‚ which is to compete globally‚ increase productivity and standards of living (as cited in Norris‚ 2009). Write the end-of-text reference here: Norris‚ R. (2009). The Issues of Standardized Testing. Education Assessment‚ 4‚ 123-124. Question 2
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Issues in Psychological Testing PSY/475 October 24‚ 2011 Issues in Psychological Testing What are at least two ethical issues associated with psychological testing? What impact do these issues have on the field of psychological testing? Informed consent involves the process by which a psychologist gain an individual’s voluntary consent prior to the administration of an assessment or test. As stated by Hogan (2007)‚ “The psychologist is responsible for informing the person about
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The amount of issues with standardized testing is astounding. One big issue that has gotten out of control in the past years is the excessive use of testing. Rizga stated‚ “A child entering prekindergarten today will take‚ on average‚ 113 standardized assessments by the time he or she graduates from public school.” (40). Between grades 3 to 8‚ public school students take about 10 to 20 standardized tests per year (Rizga‚ 40). In America‚ students attending public schools take more standardized tests
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