Does Aerobic growth involve the growth of microorganisms with or without presence of air?

• A. With Presence of Air
• B. Without Presence of Air
• C. In Vacuum
• D. In Pure Nitrogen

Answer: (A)

Aerobic growth means organisms that require oxygen to grow, using oxygen as the final electron acceptor in their energy production. Air provides that oxygen, so growth occurs in the presence of air. The other environments lack oxygen—without presence of air, in vacuum, or in pure nitrogen—so they do not support true aerobic growth. Some organisms can grow without oxygen or with low oxygen (anaerobes or microaerophiles), but the concept in question centers on requiring oxygen, i.e., growing in the presence of air.