Question

In an experiment to determine the likelihood of spontaneous generation of bacteria in a broth of nutrients in a flask, Pasteur designed

a flask with a curves neck. The neck was left intact, broken off, or tilted to come in contact with a surface. Which experimental design

component BEST represents the negative control in this experiment?

Answer 1

The flask that is broken off serves as the negative control in the set up.

What is a negative control?

A negative control is in the experiment that didn't receive the treatment in the experiment hence no response  whatsoever is expected from that group.

In the case of the experimental design described in the question, the flask that is broken off serves as the negative control in the set up.

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