Big holes in Swiss cheese are made by a:
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 the option (c) a bacterium producing a large amount of carbon dioxide
Explanation: A bacterium called Propionibacterium sharmanii produces a large amount of carbon dioxide during fermentation. This is the reason of big holes in Swiss cheese.