Exp:- Listeria monocytogenes is a facultative anaerobic bacteria that can survive both aerobic and anaerobic conditions and is responsible for listeriosis disease. The bacterium can undergo fermentation in absence of oxygen and normal glycolysis and Krebs cycle.The main route of infection is ingestion of contaminated food. Solution Exp:- Listeria monocytogenes is a facultative anaerobic bacteria that can survive both aerobic and anaerobic conditions and is responsible for listeriosis disease. The bacterium can undergo fermentation in absence of oxygen and normal glycolysis and Krebs cycle.The main route of infection is ingestion of contaminated food..