AIM: Where do Living things come from? Explain Francesco Redi’s Experiment and his contribution to science.

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Presentation transcript:

AIM: Where do Living things come from? Explain Francesco Redi’s Experiment and his contribution to science

spontaneous generation AIM: Where do Living things come from?

Question What does the term spontaneous generation come from? Answer? Long ago. People believed that life came from inanimate objects AIM: W here do Living things come from?

Answer? They believed, for instance, mice came from stacks of hay…or… That maggots came from rotting beef … Or, that bacteria was was spontaneously brought to life from broth. AIM: W here do Living things come from?

Question Who is Francesco Redi? Answer? He was the first scientist to prove that Spontaneous Generation DOES NOT happen. AIM: Where do living things come from?

Francesco Redi designed an experiment to determine whether maggots (fly babies) came from rotting meat -- as everyone believed they did. Let’s examine his experiment. AIM: Where do living things come from?

He set up his experiment as follows: He put raw meat into different glass jars. Some had a covers, some did not. He wanted to measure which jars had maggot growth. AIM: Where do living things come from?

Describe both jars. What is the difference between the two jars?

One jar is uncovered, the other is covered.

Describe both jars. What is the difference between the two jars? Which is the control, or normally occurring group

Describe both jars. What is the difference between the two jars? What is the manipulated variable

Describe both jars. What is the difference between the two jars? What is the responding variable

NOW ITS SEVEN DAY LATER! OBSERVE

Describe both jars. What is the difference between the two jars? Flies land on the meat in jar 1 Flies can’t get to the meat in the 2nd jar

Describe both jars. What is the difference between the two jars? Maggots appeared on the meat in jar #1

Describe both jars. What is the difference between the two jars? Maggots appeared on the cloth lid of jar #2. WHY?

Describe both jars. What is the difference between the two jars? AND maggots did not appear on the meat in jar #2. WHY?

Describe both jars. What is the difference between the two jars? WHY? The flies did not in come in contact with the meat

REVIEW VOCABULARY – AND THE AIM – AND THE OBJECTIVES All living things respond to stimuli Living things respond to the same stimuli in different ways (blood make some animals nervous and others excited) The way an animal responds to a stimuli typifies its behavior

Class Activity: Worksheets: 2-4

Homework: INTERNET QUESTIONS Paragraph

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