Mountaineers carry oxygen cylinders with them because

GS Air

Mountaineers carry oxygen cylinders with them because

  1. there is no oxygen on high mountains.
  2. there is deficiency of oxygen on mountains at high altitude.
  3. oxygen is used for cooking.
  4. oxygen keeps them warm at low temperature.

Answer

As we go up above the sea level, the atmospheric pressure goes on decreasing and the amount of oxygen also decreases at higher altitude. This is why, mountaineers carry oxygen cylinders with them.

The correct option is B.