Which of the following represents obligate anaerobes

Options

A. Spirogyra
B. Pisum sativum
C. Onion
D. Methane bacteria

Answer

D

Explanation

Bacteria that grow only in the absence of oxygen such as clostridium, Bacteroides and methane producing archaea are called obligate anaerobes because their energy generating metabolic processes are not coupled with the consumption of oxygen.