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People who have migrated from the planes to an area adjoining Rohtang Pass about six months back
have more $RBCs$ and their haemoglobin has a lower binding affinity to $O_2$
are not physically fit to play games like football
suffer from altitude sickness with symptoms like nausea, fatigue, etc.
have the usual $RBC$ count but their haemoglobin has very high binding affinity to $O_2$
Solution
(a) : Tourists visiting high altitude areas such as Rohtang Pass or Mansarovar, experience altitude sickness. Its symptoms include nausea, fatigue and heart palpitations. This is because in the low atmospheric pressure of high altitudes, the body does not get enough oxygen. But, gradually we get acclimatized and stop experiencing altitude sickness. The body compensates low oxygen availability by increasing red blood cell production, decreasing the binding affinity of haemoglobin and by increasing breathing rate.
