Question

Give reasons for the following: [5 marks]
a) Mountaineers carry cylinders with them while climbing high mountains.
b) We feel suffocated in a closed room where something is burning.
c) Why do factories have long chimneys?

Answer 1

a) The oxygen content decreases as we move to high altitudes like mountains, so mountaineers carry oxygen cylinders with them to breathe there. [2 marks]
b) Burning of some material releases smoke that contains few gases and fine dust particles that is harmful, thus we feel suffocation in a closed room, where some material is burning. [2 marks]
c) Factories have long chimneys to release harmful gases and smoke at a height away from us. [1 mark]