Paper 1 · People, Development and Environment
UGC NET December 2021 June 2022 (21.09.2022) Shift-I
Carbon monoxide pollution may cause loss of consciousness or death in an exposed individual. For such an event to occur, the likely minimum percentage saturation level of carboxyhaemoglobin in human blood would be
A5%
B15%
C30%
D60% ✓ Correct
Correct answer: (D) 60% — The answer is 60 percent.
Explanation
★The answer is 60 percent.
★Carbon monoxide binds haemoglobin far more strongly than oxygen does.
★This forms carboxyhaemoglobin and blocks oxygen from binding.
★At around a 60 percent saturation level this can cause loss of consciousness or death.
★So the likely minimum level for such an event is 60 percent.
★The lower percentages are not enough to cause it.
★So the answer is 60 percent.
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