Identify the correct pairs of gases and their corresponding sources.
Identify the correct pairs of gases and their corresponding sources.
- Vehicles, Methane - Excreta of all living organisms, Water vapour - Sea water, 
- Plants
- Excreta of all living organisms, Water vapour - Sea water, 
- Plants, Methane - Vehicles
Methane - Vehicles, Water vapour - Excreta of all living organisms, 
- Plants, 
- Sea water
- Vehicles, Methane - Sea water, Water vapour - Excreta of all living organisms, 
- Plants
The correct option is A - Vehicles, Methane - Excreta of all living organisms, Water vapour - Sea water, - Plants
The correct pairs are:
(i) CO2 - Vehicles
Reason:- Fuels used in vehicles contain carbon along with other elements. So combustion of these fuels converts carbon to carbon dioxide.
(ii) Methane - Cow dung is used to produce biogas than contains methane.
Reason:- Cow dung contains methane and slurry of cow dung is used in biogas to obtain biogas.
(iii) Water Vapour - Seawater
Reason:- A sunlight falls on seawater then molecules of water on the surface have higher kinetic energy than molecules below the surface and they evaporate to convert into water vapour.
(iv) O2 - Plants
Reason:- During photosynthesis plants take carbon dioxide CO2, water H2O in the presence of chlorophyll and sunlight to produce glucose and oxygen.
6CO2(g) +6H2O(l) sunlight , chlorophyll−−−−−−−−−−−−−→ C6H12O6(s) + 6O2(g)
- Vehicles, Methane - Excreta of all living organisms, Water vapour - Sea water, - Plants
The correct pairs are:
(i) CO2 - Vehicles
Reason:- Fuels used in vehicles contain carbon along with other elements. So combustion of these fuels converts carbon to carbon dioxide.
(ii) Methane - Cow dung is used to produce biogas than contains methane.
Reason:- Cow dung contains methane and slurry of cow dung is used in biogas to obtain biogas.
(iii) Water Vapour - Seawater
Reason:- A sunlight falls on seawater then molecules of water on the surface have higher kinetic energy than molecules below the surface and they evaporate to convert into water vapour.
(iv) O2 - Plants
Reason:- During photosynthesis plants take carbon dioxide CO2, water H2O in the presence of chlorophyll and sunlight to produce glucose and oxygen.
6CO2(g) +6H2O(l) sunlight , chlorophyll−−−−−−−−−−−−−→ C6H12O6(s) + 6O2(g)
