On the Basis of Oxygen Requirements
Microbes can be classified as under on the basis of their requirements of oxygen:
(i) Obligate aerobes: need molecular oxygen.
(ii) Obligate anaerobes: grow in absence of oxygen.
(iii) Facultative anaerobes: aerobes having ability to grow in absence of oxygen.
(iv) Facultative aerobes: anaerobes that can grow even in the presence of oxygen.
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