Triphosphate (ATP)‚ which gives them the energy they need to perform. In this experiment‚ creatine is added to water and its effects on Daphnia is tested. By observing the heart rate‚ one can determine if the creatine increases or decreases heart rate. Heart rate was chosen to be measured because one can then see how creatine affects the heart. If it is unhealthy for the Daphnia‚ it could potentially be unhealthy for humans. “Long-term safety of creatine supplementation has been questioned. This retrospective
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the effects that daphnia had on algae growth. Lastly sampling is important because you need to be able to take the right measurements and the right amounts of sampling so we are discovering all aspects of the experiment. Taking each dose and filtering it helped see if phosphorus would have an effect on each of the three flasks by taking one sample of non filtered water and one with filtered water. I think for both of the graphs show that the treatment with the algae and daphnia was something to
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PRACTICALS You will need to know these practicals as the exam board may ask you questions based on them. Below is a summary of each one. Name of practical and independent & dependent variables Effect of caffeine on Daphnia heart rate Independent: caffeine concentration Dependent: heart rate of Daphnia Measuring the content of Vitamin C in fruit juice Independent: fruit juice Dependent: volume of juice required to decolourise 1cm3 of DCPIP The effect of temperature on cell membranes Independent: temperature
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In the Kingdom Exploration lab‚ five different organisms were observed under a microscope‚ (Yeast‚ Paramecium‚ Elodea‚ Daphnia‚ Euglena). Each of these organisms is apart of one of the six kingdoms‚ (Eubacteria‚ Archaebacteria‚ Fungi‚ Protista‚ Plantae‚ and Animalia) which are apart of three domains‚ (Archaea‚ Bacteria‚ and Eukarya). In this lab‚ however‚ none of the organisms observed were archaea or bacteria. Also‚ all the organisms were eukaryotes‚ not prokaryotes‚ which are organisms without
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known for their hardiness as well as flamboyant coloring (Champan et. Al 1998). The prey in question is the Daphnia‚ a large group of small planktonic crustaceans which can also exist in almost any freshwater body (Ebert 2005). The predatory nature of the Tetra will be put into question in two scenarios. One where the Tetra can easily find its prey in a two-species interaction with the Daphnia. And another where the Tetra will have to spend time and energy searching for its prey in the presence of
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r = 1/week a= 0.01/copepods/week f= 0.01 copepods/prey q= 0.1/ week An experimental lake was initiated with 1000 algae cell/m3 and 10 Daphnia/m3. A. The model predicts that at these densities‚ the algae density will initially _________ (3pts) a. increase b. decrease c. not change B. The model predicts that at these densities the Daphnia density will initially _______ (3pts) a. increase b. decrease c. not change C. Based on this model the per-capita death rate of copepods _________
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Succession‚ the process of a community changing over time‚ can be broken down into sub groups such as ecological‚ primary‚ pond‚ and secondary. Ecological succession being the most basic. In the Succession Lab‚ we observed a community in a ecosystem. As we recorded the data each class‚ we observed that succession takes place with rapid speed for in each observation‚ a new specimen is identified. A niche is how the organisms live‚ what their role in the community is. For example‚ an ecological
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Does caffeine affect heart rate? Background Information: Caffeine is a bitter white crystalline xanthine alkaloid that acts as a psychoactive stimulant drug. A German chemist‚ Friedrich Ferdinand Runge‚ discovered it in 1819. Plants produce caffeine as an insecticide. It is found in varying quantities in the beans‚ leaves‚ and fruit of over 60 plants‚ where it acts as a natural pesticide that paralyses and kills certain insects feeding on the plants. Cocoa in South America‚ coffee in Africa
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some cases the offspring inherit all the characteristics of his mother and it’s basically equal so the offspring inherits the diseases and characteristics of the mother‚ but also the offspring could be male in most of animals‚ that’s the case of Daphnia Magna. This specie could reproduce sexually but in natural populations parthenogenesis is the most common mode (Herbert‚ Ward 1972). Sexual reproduction is the mode of reproduction that most animals use but is the one that use more energy. Individuals
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Description To investigate the effect on caffeine on heart rate of water fleas and to understand the risk of high level consumption of caffeine to the health of the human circulatory system and nervous system. Preview Diagram 1: Chemical structure of caffeine Image source: http://ismaastricht.wikispaces.com/file/list The images above show the chemical structure of caffeine which has a chemical formula of C8H10N4O2. Caffeine was named by the International Union of Pure and Applied Chemistry
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