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Question

What is the percentage of carbon dioxide in exhaled air? 



A

21%  

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B

0.04%  

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C

4.4% 

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D

16.4%   

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Solution

The correct option is D

4.4% 


The percentage of carbon dioxide in exhaled air is more than that of the percentage of carbon dioxide in the inhaled air. Inhaled air has about 0.04% of carbon dioxide. This is also the amount of carbon dioxide present in the atmosphere. The exhaled air contains all the carbon dioxide that is a by product of the cellular metabolic processes. Hence, the percentage of carbon dioxide in the exhaled air is 4.4%. 


Biology

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