Question Detail

MIC 121 Introductory Microbiology Objective Question
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Question

Lazzaro Spallanzani improved upon Needham's experiment by demonstrating that:
Options
A Microbes could grow in broth even after boiling for an hour.
B Longer boiling and completely sealing the flasks prevented microbial growth.
Correct Answer
C Microbes only grew in flasks that were loosely corked, regardless of boiling time.
D Microbes were attracted to the odor of meat, similar to flies.
Correct Answer

Option B is the correct answer.

Detailed Explanation

Spallanzani's experiment showed that broth boiled for 1 hour and then sealed by melting the flask mouth had no microbial growth. This demonstrated that longer boiling effectively sterilized the broth, and when sealed, no microorganisms from the air could enter, disproving spontaneous generation.

Hint

Spallanzani's experiment directly countered Needham's findings by making a crucial change to the procedure.

Question Info

Course: MIC 121
Topic: Introductory Microbiology
Type: Objective
Difficulty: Not specified
Question 169 of 984
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