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Question

Regarding the assertion and reason, choose the correct option:
Assertion [A]: Methane component of greenhouse gases contributes to global warming by about 20 percent.
Reason [R]: Introduction of multipoint fuel injection engines in automobiles has decreased methane content in exhausts.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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C
Assertion is true but Reason is false
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D
Both Assertion and Reason are false
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Solution

The correct option is B Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

Carbon dioxide contributes to about 60% of the total global warming and the shares of methane and chlorofluorocarbons (CFCs) are 20% and 14% respectively. N2O also contributes to about 6% of the total global warming. Efficient engines such as multipoint fuel injection engines can reduce the amount of unburnt hydrocarbon (methane) in auto-emissions, which can decrease the emission of these gases from automobiles.


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