1. Where do organisms come from?
Chapter 1.6
Where do organisms come from?

2. Where do living things come from?
Long time ago, people believed that living things could come from anything. For example: they believed that mice came from straw. Also, they believed that worms came from meats.

3. Spontaneous generation
Spontaneous generation: an idea that living things come from nonliving things.

4. Redi’s Experiment
Control group
Experimental group
He believed that living things come from living things of the same kind. He did an experiment proving that living things did not come from non-living things.

5. Pasteur’s Experiment
Pasteur performed an experiment to show that living things did not come from the broth. They came from the air.

6. Website:
art/redi_pasteur_experiment/index.html

7. Final conclusion:
All life comes from existing life.

8. Extra info- life cycle of a fly:
maggots

9. Checking Concepts: What is spontaneous generation?

10. What was Redi’s hypothesis?

11. Why do flies often lay eggs on spoiled meat?

12. Which jar was the control from Redi’s experiment and which jar was the experimental group?

13. Why is it important to use a control group in an experiment?

14. Fill in the blanks.
The idea that living things come from non- living things is called ____________________.
In Redi’s experiment, after a few days, ____________ showed up in the uncovered jar.
Pasteur proved that microorganims came from ____________.
Spoiled meat serves as a _______________ for bacteria, maggots, and other microorganisms.