Q. A bacterium which is capable of utilizing the most abundantly available gas in the atmosphere for one of its metabolic pathways, but cannot utilize the second most abundantly available for its another metabolic pathway is
A) $Azotobacter$
B) $Clostridium$
C) $Rhodomicrobium$
D) $Xanthomonas$
Explanation
Atmosphere contains $N_{2} = 78\%$ (most abundant available gas) $O_{2} = 21\%$ (second most abundant gas) $Clostridium$ is an anaerobic bacterium, which does not require $O_{2}$ for respiration but it can fix atmospheric nitrogen (most available atmospheric gas)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.