Question

People who have migrated from the planes to an area adjoining Rohtang pass about six months back ____________

• A. have more RBCs and their haemoglobin has a lower binding affinity to $O_2$
• B. are not physically fit to play games like football
• C. suffer from altitude sickness with symptoms like nausea, fatigue, etc.
• D. have the usual RBC count, but their haemoglobin has very high binding affinity to $O_2$

Answer 1

The correct option is A have more RBCs and their haemoglobin has a lower binding affinity to $O_2$

At higher altitude haemoglobin has a lower binding affinity to $O_2$. Hence, people who have migrated from planes to an area adjoining Rohtang pass (more than 10000 m height) for about six months have more RBCs to compensate for the low binding affinity of haemoglogin to oxygen.