. Assertion: A concentration of methane in the atmosphere has more than doubled in the last 250 years

Reason Wetlands and rice field are the major sources of methane.

Best Answer

Answer: (a)

Solution :Methane is a green-house gas. The main sources of it are cattle dung, rice paddy fields, wetlands, burning of the biomass and mining of coal and mineral oil. Roots of rice plant’s capture methane from muddy surroundings and transport it though the plant’s vascular system to the atmosphere. According to an estimate, around 100 million tunnes of methane are released annually.


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