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Links:
Biology I Curriculum Page
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Purpose:
To determine the effect of one variable on an enclosed ecosystem.
Summary:
Students design an experiment to test the effect of a single variable on the growth of radish seeds in a closed ecosystem. After teacher approval, students construct two closed ecosystems (experimental and control groups). Students measure pH, height of water in bottle, number of seedlings growing, and height of seedlings over a period of 3 to 4 weeks. At the conclusion, students use computers to create a graph of the collected data and write a concluding paragraph about the results of the experiment.
Objectives Links:
Core Lab 15: TerrAqua Column
Process Skills Checklist
Materials:
- 2 liter pop bottles
- potting soil, sand or garden soil
- radish seeds
- distilled water, vinegar or pond water
- fertilizer stakes or Miracle Gro
- clear packing tape
- scissors
- graduated cylinders
- laptop computers
- graphing software
Safety Concerns:
Do not eat or drink. Use caution with chemicals and sharp objects. Use caution with electrical equipment, especially cord tripping hazards.
Revision Date:
Summer, 2005
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