Question

Compared with atmospheric air, air breathed out by a human contains
A less water vapour, less carbon dioxide.
B less water vapour, more carbon dioxide.
C more water vapour, less carbon dioxide.
D more water vapour, more carbon dioxide.

Answer 1

Answer:

more water vapour and more carbondioxide

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Explanation:

Answer 2

Answer:

More water vapour, more carbon-dioxide is the correct answer.

Explanation:

Air breathed out by a human contains more water vapour and more carbon dioxide compared to atmospheric air. Therefore, the correct option is D) more water vapour, more carbon dioxide.

• When we inhale air, it contains about 21% oxygen and 0.04% carbon dioxide, along with other gases. When we exhale air, it contains less oxygen and more carbon dioxide, along with other gases.

• The reason for this is that our body uses the oxygen in the inhaled air to produce energy through respiration, and carbon dioxide is one of the waste products of this process. As a result, the exhaled air contains more carbon dioxide than inhaled air.

• In addition, when we exhale, we also release water vapour from our lungs into the air. This is because our lungs transfer water from the bloodstream into the air we exhale as a way of removing excess water from the body.

Therefore, air breathed out by a human contains more water vapour and more carbon dioxide than atmospheric air.

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