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Description
Students evaluate how ecosystems are impacted by increasing salt concentrations. They first examine the effects on freshwater ecosystems by evaluating the impact of sodium chloride (NaCl) on duckweed (Lemna minor). Then students study how magnesium chloride (MgCl2) and calcium chloride (CaCl2) affect the survival of duckweed. In doing this, students calculate the LC50 and create dose response curves for the different solutions.
- Connected to Unit 8: Aquatic and Terrestrial Pollution, topics 8.2: Human Impacts on Ecosystems, 8.12: Lethal Dose 50%, and 8.13: Dose Response Curve
In these investigations, students evaluate how ecosystems are impacted by increasing salt concentrations. Students first examine the effects on freshwater ecosystems by evaluating the impact of sodium chloride (NaCl) on duckweed (Lemna minor). Then students study how magnesium chloride (MgCl2) and calcium chloride (CaCl2) affect the survival of duckweed. In doing this, students calculate the LC50 and create dose response curves for the different solutions. Kit includes materials for 8 groups of students. Note: Order the kit with the perishable material included or with a voucher to request perishables later at your convenience. Contact Carolina or return the voucher to request delivery of perishable material.
