Multiple choice

Who proved that bacteria are found in air?

  1. Louis Graham

  2. Louis Pasteur

  3. William Pasteur

  4. William Johnson
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Louis Pasteur conducted his famous swan-neck flask experiment in 1859 which proved that microorganisms exist in air and can cause contamination. His experiment disproved spontaneous generation and established that bacteria are present in air and can be the cause of spoilage. The other names listed (Louis Graham, William Pasteur, William Johnson) are either fictitious or not associated with this discovery.

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