Visiting high mountains may cause altitude sickness in men living in plain areas. Prime cause of this is

excess of

C O_{2}

in blood

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decreased efficiency of haemoglobin

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decreased partial pressure.of oxygen

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decreased proportion of oxygen in air.

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Solution

The correct option is D decreased partial pressure.of oxygen
The effects of high altitude on humans are considerable. The percentage oxygen saturation of haemoglobin determines the content of oxygen in the blood. When a person living in the plain area visit high mountains up to around 2,100 m (7,000 feet) above sea level, the saturation of oxyhaemoglobin begins to decrease rapidly in the blood and can cause hypoxia.
So, the correct answer is "Decreased partial pressure of oxygen".

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