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The Role of Scientists in the Professional Development of Science Teachers (1996) / Chapter Skim
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Appendix H-1
Pages 221-224

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From page 221...
... One of the plants common to this ecosystem is a plant called duckweed. If you have a pond or stream near your home or school, collect some of these plants for the class experiment.
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From page 222...
... · What economic factors relate to environmental pollution such as acid rain? · What political factors are involved in preventing or cleaning up environmental pollution?
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From page 223...
... Inoculating loop or similar device to pick up and transfer duckweed from source to team vessel. · Graph paper.
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From page 224...
... HYPOTHESIS OR PREDICTION Now that you have completed the preliminary part of this lab and have recorded the growth patterns of duckweed, design a procedure for testing one factor that would influence the growth of the duckweed. From the information that you have about this topic, develop a hypothesis that could be tested in a controlled experiment that will gather quantitative data.
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Key Terms

  • controlled experiment
  • similar container
  • inoculating loop
  • similar device
  • light source

  • growth culture
  • collected yourself
  • water provided
  • normal con
  • plant called

  • duckweed growth
  • hand lens
  • source provided
  • team vessel
  • factors relate

  • experiment based
  • investigation design
  • aquatic ecosystems
  • stream algae
  • duckweed population

  • growth patterns
  • growth pattern
  • environmental pollution
  • stereo microscope
  • various plants

  • microscopic examination
  • plant structure
  • time growth
  • human induced
  • initial culture


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