Chapter 1.2. 1. Asking a Question 2. Forming a Hypothesis (MUST be testable) 3. Setting up a Controlled Experiment 4. Recording and Analyzing Results.

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Presentation transcript:

Chapter 1.2

1. Asking a Question 2. Forming a Hypothesis (MUST be testable) 3. Setting up a Controlled Experiment 4. Recording and Analyzing Results (data) 5. Forming Conclusions

 Spontaneous Generation states that life can arise from nonliving matter -- like rotting meat making maggots -- mice being found in grain -- beatles and bugs being found on poop

 Redi did not think that life could just spontaneously appear from other nonliving things.  He decided to challenge this idea by applying the scientific method and testing a hypothesis

 What could be done to test whether or not meat can “spontaneously generate” maggots (baby flies)  Lets think of an experiment to perform to prove this right or prove this wrong

 Many people still believed in spontaneous generation  They said that air (or oxygen) is required for this to occur – spontaneously!!!!  ANOTHER SCIENTIST THEN STEPPED IN  Louis Pasteur designed an experiment to settle this absurd idea

 Pasteur designed a flask with a long curved tube coming off the top  The bacteria was unable to reach the broth, but it was still open to the environment… meaning oxygen could still reach the broth  No bacteria grew!!!!!

 Pasteur made many discoveries related to microorganisms  His work showed that infectious diseases were a result of microorganisms entering the bodies of the victims

 As the evidence builds up, a particular hypothesis may become so well supported that scientists accept them as a THEORY  This is what happened to the hypothesis that new organisms come from existing organisms  This is now referred to as “Biogenesis” – generating from life

 In science, the word THEORY applies to a well tested explanation that unifies a broad range of observations  A theory allows scientists to make accurate predictions about new situations

1. How did Pasteur’s experiment put an end to the idea of “spontaneous generation”??

2. How does a scientific theory compare with a scientific hypothesis?

3. How do scientists today usually communicate their results and conclusions?

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