Q

What is exhaled in human respiration?

RRB NTPC (Stage-I) 05/04/2016 (Shift-III) 2016
✓ Answer: D Carbon dioxide
The source key selects carbon dioxide as the respiratory waste gas. Exhaled air is actually a mixture containing nitrogen, oxygen, carbon dioxide and water vapour, so option A is also scientifically valid under this wording.
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