Which of the following component of air is harmful to us?
Nitrogen
Dust particles
Oxygen
Carbon dioxide
Dust particles are always present in air but are harmful to us.
Question 7
The components of air which are harmful to living beings are :
a) Nitrogen.
b) Water vapour.
c) Dust and smoke.
d) Carbon dioxide.
Name the component of blood which transports : 1) Food, carbon dioxide and nitrogenous wastes. 2) Oxygen
Which of the following air pollutant reduces the oxygen-carrying capacity of blood to a large extent?
(a) carbon dioxide
(b) nitrogen monoxide
(c) carbon monoxide
(d) sulphur dioxide