Facultative means "optional" or "discretionary", used mainly in biology in phrases such as: Facultative, facultative wetland, or facultative upland: wetland indicator statuses for plants Facultative anaerobe, an organism that can use oxygen but also has anaerobic methods of energy production.

What do u mean by facultative?

Facultative means "optional" or "discretionary" (antonym obligate), used mainly in biology in phrases such as: ... Facultative anaerobe, an organism that can use oxygen but also has anaerobic methods of energy production. It can survive in either environment.

What is meant by facultative bacteria?

facultative bacteria (FACK-ul-tay-tive)

Bacteria that can use dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate ions, or some can respire through glycolysis. The bacteria can live under aerobic, anoxic, or anaerobic conditions.