Science/Strand III/Content Standard 5/High School/Benchmark 6
Benchmark Question: What are the effects of agriculture
and urban development on selected ecosystems?
Focus Question: What is the impact of pollution on
Students will work in small
groups to develop an experiment to determine the impact of a specific
pollutant on a specific population of plants and animals. Each student will
summarize, discuss, and analyze the effects on an ecosystem in a lab
Predict how different
concentrations of phosphate detergents and liquid fertilizer high in
nitrogen will affect the growth of duckweed*. Design an experiment to test
how different concentrations of nitrates and phosphates affect the growth
of Duckweed. Count the number of leaflets in the population at the
beginning and the end of the experiment**.
* Duckweed can be found in most
freshwater ponds and can be grown in an aquarium for a long period of time.
** Any lab dealing with populations of
organisms will require monitoring over several days or weeks.
Extension: Students may want to test the
effects of used
motor oil concentrations on the duckweed populations. Remember to dispose
of oil at a recycling center.