Classify the steps:
Pastuer's experiment:
Answer variants:
When these flasks were kept months together, no life appeared in them as the neck of the flask trapped the dust particles.
He boiled the broth in the flask so that the microorganisms in this flask are killed.
Hence, through this experiment, he concluded that the flasks kept airtight with dead yeast did not produce any life forms. However, another flask that was kept open to the air produced living organisms from the deceased yeast.
The curved neck of the flasks acted as a filter.
He took killed yeast in a swan neck flask.
When this neck was broken off, the broths developed colonies of microbes such as moulds.
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Results and conclusion: