
Mountaineers carry oxygen cylinders with them while climbing high mountains. Why?

Important Questions on Air

During winter vacations, Manava and Urja went to meet their grandmother who lives in Kosani. To protect them from cold, Grandmother lighted angithi in their room. Both Manav and Urja felt warm and cozy and immediately fell asleep. Sometime in the late night, Urja felt suffocated and started coughing heavily. Manav woke up, immediately opened the main door of the room and saved Urja from further suffocation.
What values were shown by Manav?

During winter vacations, Manava and Urja went to meet their grandmother who lives in Kosani. To protect them from cold, Grandmother lighted angithi in their room. Both Manav and Urja felt warm and cozy and immediately fell asleep. Sometime in the late night, Urja felt suffocated and started coughing heavily. Manav woke up, immediately opened the main door of the room and saved Urja from further suffocation.
Which gas causes suffocation in a closed room?

During winter vacations, Manava and Urja went to meet their grandmother who lives in Kosani. To protect them from cold, Grandmother lighted angithi in their room. Both Manav and Urja felt warm and cozy and immediately fell asleep. Sometime in the late night, Urja felt suffocated and started coughing heavily. Manav woke up, immediately opened the main door of the room and saved Urja from further suffocation.
Was Manav right to open the window? Why/why not?

While coughing, Urja was gasping for air rich in
