Question

multiple choice question
pasteur showed that even cultures open to the air could remain sterile by using ______.

biochemical techniques
swan - neck flasks
cotton plugs
beakers of broth

Explanation:

Louis Pasteur's famous experiment used swan-neck flasks. The curved neck allowed air to enter but trapped airborne microbial contaminants, proving that open cultures could stay sterile without excluding air, disproving spontaneous generation.

Answer:

B. swan-neck flasks