Which of the following is an example of anaerobic respiration? Which of the following is an example of anaerobic respiration?

Production of ethanol in yeast
Oxygen diffusing into a plant cell through stomata
Physical exchange of gases in the lungs
Breaking down of glucose with oxygen inside an animal cell

An example of anaerobic respiration is production of ethanol in yeast.

Explanation:

Anaerobic respiration is a process of energy production in living organisms that occurs in the absence or without the requirement of oxygen.

O₂ is the ultimate acceptor of electrons in aerobic respiration, but in anaerobic respiration it is a different substance than O₂.  In yeast metabolism, the final acceptor in the electron chain may be acetaldehyde, with the final result being ethanol. This process involves a type of anaerobic metabolism called fermentation, an example of anaerobic respiration.

    The other options involve the participation of oxygen in a respiration process, so they are not correct.