Which organism can live without oxygen?

Correct option is D

The correct answer is (d) Anaerobe.
· Anaerobic organisms are those that can survive and grow in environments that lack oxygen.
· They obtain energy through anaerobic respiration or fermentation, using substances other than oxygen as the final electron acceptor.
· Anaerobes can be further divided into obligate anaerobes, which are harmed by the presence of oxygen, and facultative anaerobes, which can switch between aerobic and anaerobic metabolism.
· Common examples of anaerobes include bacteria like Clostridium and Bacteroides.
· These organisms are found in environments such as deep ocean floors, swamps, and the digestive tracts of animals where oxygen is scarce.
Information Booster:
· Symbiotic organisms: These live in a close, often long-term interaction with another organism where both may benefit, like lichens or nitrogen-fixing bacteria in plants.
· Parasites: These organisms live in or on a host and derive nutrients at the host's expense. They can be either aerobic or anaerobic depending on their habitat.
· Aerobes: These organisms require oxygen for survival. They obtain energy through aerobic respiration, which involves using oxygen as the final electron acceptor in the metabolic pathway.