Cows, sheep and goat during their normal digestion process produce large amount……
a) ethane
b) methane
c) propane
d) octane
……also contribute methane to environment.
a) termites
b) butterfly
c) bird
d) none of these
Anthropogenic/man-made sources of air pollution
Man-made sources of air pollutants are……
a) burning of coal
b) factories smoke
c) vehicle exhaust
d) all of these
Automobile exhaust…of CO to environment.
a) 70%
b) 75%
c) 80%
d) 85%
In combustion of fossil fuels, smoking forest fires are the main source of…………to the environment.
a) CO
b) O
c) N
d) S
