Scientific method

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  • Scientific method

    1. 1. Scientific Method
    2. 2. Science works by using the scientific method to prove that ideas are wrong. cc licensed flickr photo by Image Editor: http://flickr.com/photos/11304375@N07/2769519295/
    3. 3. Steps in the scientific method: Step 1 - observation, questioning cc licensed flickr photo by Geek2Nurse: http://flickr.com/photos/ladylong/393625116/
    4. 4. Steps in the scientific method: Step 1 - observation, questioning Why are these bacteria growing here? cc licensed flickr photo by Geek2Nurse: http://flickr.com/photos/ladylong/393625116/
    5. 5. Step 2 - Research, Experimentation Types of variables in an experiment: • manipulated (independent) - are changed as part of experiment • controlled - held constant during the experiment • responding (dependent) - conditions that are observed to change during the experiment
    6. 6. In Pasteur’s experiment
    7. 7. In Pasteur’s experiment • manipulated - allowing/ preventing particles in air to reach broth
    8. 8. In Pasteur’s experiment • manipulated - allowing/ preventing particles in air to reach broth • controlled - sterile broth, same kind of container, same kind of broth,location of flask, how long was the broth left, volume of broth
    9. 9. In Pasteur’s experiment • manipulated - allowing/ preventing particles in air to reach broth • controlled - sterile broth, same kind of container, same kind of broth,location of flask, how long was the broth left, volume of broth • responding - growth of bacteria
    10. 10. An experiment tests a hypothesis (proposed explanation for the phenomenon) Pasteur suggested bacteria in the air caused the bacterial growth. cc licensed flickr photo by kaibara87: http://flickr.com/photos/kaibara/2234750993/
    11. 11. Step 3 - Observation What were the results of the experiment Pasteur saw bacterial growth only after the broth was infected by the dust from the air.
    12. 12. Step 4 - Development of a theory After repeated experimentation, a theory is developed which might then be tested further (back to Step 2)
    13. 13. A good theory: • explains observed phenomenon • makes predictions • is (scientifically) testable
    14. 14. Is cell theory a good theory?

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