Question

What contains a higher amount of $C{O_2}$ ?
(A) Expired
(B) Inspired air
(C) $C{O_2}$ does not exist
(D) Both A and B

Answer 1

Carbon dioxide is a molecule that exists as a gas. The atoms in the carbon dioxide are carbon and two oxygen atoms. Breathing is a process consuming air into the body, this process involves the inspiration of oxygen by lungs and leaves out carbon dioxide by lungs through the nose. The air coming out of lungs is called expired air.

Complete answer:
Breathing is the process done by organisms; the air contains different gases. The oxygen can be taken by lungs and it is used to carry hemoglobin throughout the body. Oxyhemoglobin is a stable bond but not more stable than carboxyhemoglobin.
The air that breathed consists of oxygen, carbon dioxide and other gases. But the inspired air contains more oxygen useful for the process of breathing.
After the process of absorption of oxygen by lungs the carbon dioxide will be exhaled out from the lungs. Thus, expired air consists of carbon dioxide.
Generally, trees absorb carbon dioxide and exhale oxygen. Humans breathe oxygen gas and exhale carbon dioxide.
Thus, exhaled air consists of a higher amount of $C{O_2}$ .
Option A is the correct one.

Note:
Photosynthesis is the process of preparing their food material i.e.. starch by trees from carbon dioxide and water vapor. The products are oxygen and glucose. Thus, trees absorb carbon dioxide and release oxygen. Humans absorb oxygen and release carbon dioxide.