Question

Identify the correct pairs of gases and their corresponding sources.

• A. (i) $C{O}_2$ - Vehicles, (ii) Methane, $C{H}_4$ - Excreta of all living organisms, (iii) Water vapour - Seawater, (iv) $O_2$ - Plants
• B. (i) $C{O}_2$ - Excreta of all living organisms, (ii) Water vapour - Seawater, (iii) $O_2$ - Plants​, (iv) Methane, $C{H}_4$ - Vehicles
• C. (i) Methane, $C{H}_4$ - Vehicles, (ii) Water vapour - Excreta of all living organisms, (iii) $O_2$ - Plants, (iv) $C{O}_2$ - Seawater
• D. (i) $C{O}_2$ - Vehicles, Methane, (ii) $C{H}_4$ - Seawater, (iii) Water vapour - Excreta of all living organisms, (iv) $O_2$ - Plants

Answer 1

The correct option is A

(i) $C{O}_2$ - Vehicles,

(ii) Methane, $C{H}_4$ - Excreta of all living organisms,

(iii) Water vapour - Seawater,

(iv) $O_2$ - Plants

The correct pairs are:

(i) $C{O}_2$ - Exhaust from vehicles contains carbon dioxide (due to combustion of carbon-based fuels)

(ii) Methane, $C{H}_4$ - Excreta of all living organisms undergoes anaerobic decomposition naturally to give methane

(iii) Water Vapour - When seawater evaporates, a lot of water vapour is formed.

(iv) $O_2$ - Plants evolve oxygen as a by-product of photosynthesis.