Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
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.A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
C) If assertion is true statement but reason is false.
D) If both assertion and reason are false.
Correct 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 plants capture methane from muddy surroundings and transport it through the plants vascular system to the atmospher. According to an estimate, around 100 million tunnes of methane are released annually.
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