Question

Statement I: Mountaineers carry oxygen cylinders with them while climbing high mountains.

Statement II: The percentage of oxygen in air decrease with increasing altitude.

• A. Statement I is true and statement II is the correct explanation
• B. Both statements are false
• C. Statement I is true and statement II is false
• D. Statement I is false and statement II is true

Answer 1

The correct option is C

Statement I is true and statement II is false

The percentage of oxygen in air is the same at sea level as it is at high altitudes, which is around 21%. However, at high altitudes the pressure is lower and air is more spread out leading to less oxygen availbility for our body. Hence, mountaineers carry oxygen cylinders with them while climbing high mountains.