Question

The true statement about ‘green-house effect’ is that it is

(a) caused by combination of many gases

(b) caused only by CO₂

(c) caused by CO₂, CFC, CH₄ and NO₂ gases

(d) none of these.

Answer 1

Part 1 explained- Greenhouse effect is caused by a combination of number of different gases. These gases namely are water vapour(H2O), carbon dioxide(CO2), methane(CH4), Nitrous oxide(NO2), Ozone(O3), Chlorofluorocarbons(CFC’s) and Hydroflurocarbons(HFC’s). Accumulation of these gases in our atmosphere contributes to the GreenHouse Effect. Hence, this sentence is TRUE.

Part 2- explained- This sentence is not true. Since we already know that along with CO2, gases like Chlorofluorocarbons (CFC’s), Methane(CH4), Water Vapour(H2O), Nitrous Oxide(NO2), Ozone(O3) and Hydroflurocarbons(HFC’s) also contribute to the Green House effect. Hence, not true.

Part 3 explained- Not true. Because we know that along with CO2, CFC, CH4 and NO2, gases like water vapour, hydroflurocarbons are also responsible for the Greem House effect. Hence not true.

Part 4- Not True. Because Part 1 is TRUE.