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Section 1-2 How Scientists Work
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Designing an Experiment
State the Problem Analyze Results Form a Hypothesis Draw a Conclusion Set Up a Controlled Experiment Publish Results Record Results Go to Section: 12/7/2018
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Stating the Problem Maggots, mice and beetles just appearing on meat, rice and grain 12/7/2018
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Forming a Hypothesis Spontaneous generation
Francesco Redi – proposed maggots most likely came from flies laying eggs to small for people to see 12/7/2018
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Setting up a Controlled Experiement
Redi’s Experiment Section 1-2 OBSERVATIONS: Flies land on meat that is left uncovered. Later, maggots appear on the meat. HYPOTHESIS: Flies produce maggots. PROCEDURE Uncovered jars Covered jars Controlled Variables: jars, type of meat, location, temperature, time Several days pass Manipulated Variables: gauze covering that keeps flies away from meat Responding Variable: whether maggots appear Maggots appear No maggots appear CONCLUSION: Maggots form only when flies come in contact with meat. Spontaneous generation of maggots did not occur. Go to Section: 12/7/2018
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Results and Conclusions
Scientists record everything that they do in an experiment so it can be repeated Scientists use the data from an experiment to evaluate the hypothesis and draw a conclusion 12/7/2018
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