Big holes in Swiss cheese are made by:
a. a machine.
b. a bacterium that produces methane gas.
c. a bacterium producing a large amount of carbon dioxide.
d. a fungus that releases a lot of gases during its metabolic activities.
The answer is option (c) a bacterium producing a large amount of carbon dioxide.
Explanation: A bacterium called Propionibacterium shermanii produces a large amount of carbon dioxide during fermentation. This is the reason for the big holes in Swiss cheese.