Ascent of high mountains may cause altitude sickness in men. Prime ca – McqOptions

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1.	Ascent of high mountains may cause altitude sickness in men. Prime cause for this is _______
A.	Decreased proportion of oxygen in the air
B.	Decreased partial pressure of oxygen
C.	Decreased efficiency of hemoglobin
D.	Excess CO2 in blood
Answer» C. Decreased efficiency of hemoglobin

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