![]() Environmental conditions include access to light and temperature. Instruct students to add the exact same measurement of cultures to each petri dish add the same number of rice grains use the same method for counting and maintain the culture within the same environmental conditions. ![]() Ensure students understand the importance of following the exact same procedure for each culture, to generate the most accurate results possible.Students may be tempted to add too much rice to each petri dish however, inform students that 6 grains of uncooked rice will be sufficient.TEACHING NOTESĭemonstrate the correct method of preparing the Paramecium cultures in the petri dish before students begin the procedure. ![]() Which type of growth was exhibited in the Paramecium populations containing only one of the species? Determine the carrying capacity of the organism in this model environment. Logistic growth describes growth rates that are limited by a number of factors, including predators and food scarcity as well as competition for food and habitat. Did the trends in the class results differ from your own results?Įxponential growth describes population growth that is unlimited.Do your results support or refute the competitive exclusion principle? Provide evidence from your results.What do the results reveal about how competition affects population growth? Compare the population sizes of each Paramecium species in the separated (A and B) and mixed cultures (C).What are some limitations in the experiment design? Suggest how it might be improved.What are the advantages and disadvantages of this counting technique?.Was your hypothesis supported? Provide reasons. Identify whether the populations increased or decreased or remained stable. Describe what has occurred in populations A, B and C.Plot the class results as a line graph.Combine your results with the rest of the class to get class results. ![]()
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