Which one of the following is a free-living obligate anaerobic bacterium?

Question

Which one of the following is a free-living obligate anaerobic bacterium? (A) Clostridium (B) Rhodospirillum (C) Azotobacter (D) Bacillus subtilis

Tardigrade Admin · Accepted Answer

Clostridium is a free-living obligate anaerobic bacteria.

Q. Which one of the following is a free-living obligate anaerobic bacterium?