Question

The main greenhouse gas is
a) Ozone
b) Oxygen
c) Helium
d) Carbon dioxide (CO2)

Answer 1

Hint:- In Greenhouse effect, the Sun’s radiations are absorbed by greenhouse gases, but are not reflected back into the atmosphere, thus, insulating the earth’s surface and preventing it from freezing.
Greenhouse gases are those which absorb the infrared radiations, thus resulting in the greenhouse effect.

Complete step-by-step solution:-
All modern greenhouses are usually made up of glass or even plastic, to protect any plant that requires special temperature conditions. Mainly Glass is used as the building material, but plastic films, such as polyethylene or polyvinyl, and fibreglass are also used.
Greenhouse gases (GHGs) reradiate the trapped Sun’s radiations back to Earth’s atmosphere, and are thus responsible for increasing the atmospheric temperature.
Because of inappropriate human activities and interference, the proportion of greenhouse gases has increased significantly in the environment, thus causing the so-called “greenhouse effect”. Below are listed the various greenhouse gases :
- Ozone
- Carbon dioxide
- Nitrous oxide
- Chlorofluorocarbons
- Methane
- Water Vapour
Option a) Ozone - As mentioned above, it is one of the greenhouse gases. So, it can be considered as a correct option.
Option b) Oxygen - It is not a greenhouse gas, thus this option is incorrect.
Option c) Helium - It is not a greenhouse gas, thus this option is incorrect.
Option d) Carbon dioxide (CO2) - Carbon dioxide amounts to about 76% of the total greenhouse gases’ emissions, thus, it is the main greenhouse gas. Therefore, this is the more Correct option.

Note:-
- Greenhouse gases trap the sun’s radiations and energy at longer wavelengths, i.e. at infrared regions and thus increase the temperature.
- Though these gases are present in traces in the environment, they still cause a remarkable greenhouse effect.