Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life.

Solution

Louis Pasteur suggested that life propagated only from the pre-existing life forms. He conducted the swan-necked flask experiment and proved his point on the continuity of life.
His experiment was as follows:

• Two swan-necked flasks containing nutrient broth were used.

• The broth in both the flasks was boiled to kill any existing microbes and was made sterile.

• After sterilisation one of the flask necks was broken. The flasks were kept undisturbed for some time.

• After some time, the dust particles along with bacteria in the air entered the flask with the broken neck and got accumulated at the neck of the unbroken flask.

• The broth in the broken flask became cloudy, while the broth in the unbroken flask remained clear. Cloudiness of the broth indicated the presence of microbial life in the broken flask.

• Appearance of life, even after sterilisation, in the broken flask concluded that life in the flask arose only from pre-existing life; thus, and discarded the theory of spontaneous generation.

Some More Questions From Evolution Chapter

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

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Evolution

Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life.

Some More Questions From Evolution Chapter

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

What is the phenomenon called when the original drifted population becomes founders?

What are the two key concepts of Darwinian Theory of Evolution

What were the units of life according to the early Greek thinkers ?

Mention the type of nutrition in the cells originated first during the origin of life.

Which group of organisms were responsible for appearance of free oxygen in the atmosphere of the primitive earth ?

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

Name the different eras of geologic time scale.

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For Daily Free Study Material Join wiredfaculty

Evolution

Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life.

Some More Questions From Evolution Chapter

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life : Sugar, methane, nucleic acid and amino acid.

What is the phenomenon called when the original drifted population becomes founders?

What are the two key concepts of Darwinian Theory of Evolution

What were the units of life according to the early Greek thinkers ?

Mention the type of nutrition in the cells originated first during the origin of life.

Which group of organisms were responsible for appearance of free oxygen in the atmosphere of the primitive earth ?

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

Name the different eras of geologic time scale.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.