Question

For which of the following processes is Oxygen a prerequisite?

• A. Inspiration
• B. Expiration
• C. Both (A) and (B)
• D. Inspiration and combustion

Answer 1

The correct option is D Inspiration and combustion

Oxygen is the major constituent during inspiration (inhalation) and combustion because both these processes cannot occur without oxygen. In the process of expiration, the product of respiration, that is carbon dioxide leaves the body. Hence, oxidation and combustion are two processes where oxygen is a prerequisite.