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[A] : Methane component of green house g...

[A] : Methane component of green house gases contributing to global warming is about 20 percent .
[R] : Introduction of multi-point fuel injection engines in automobiles has decreased methane content in the exhausts .

A

If both are true with reason being correct explanation

B

Both true but reason is not correct explanation

C

assertion is true but reason is wrong

D

Both are wrong

Text Solution

Verified by Experts

The correct Answer is:
B
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Assertion (A) : Methane component of greenhouse gases contributing to global warming is about 20 per cent. Reason (R) : Introduction of multi-point fuel injection engines in automobiles has decreased methane content in the exhausts.

CO_2 and H_2 O absorbs strongly in the infrared region and its presence in the atmosphere decreases the loss of heat from the earth by radiation . This global warming is called the greenhouse effect (other gases , including the oxides of nitrogen from car exhaust freons from aerosols and refrigerators and methane from bacteria in the soil and in the rumen cows , also add to the greenhouse effect ). The concentration of atmospheric CO_2 has increased by 10% . The is resulting in the increase in the mean temperature of the earth by 2. 5^@ C , varying form 2^@ C the equator to 4^@ C at the poles . This could have dramatic effects on the climate. Which of the following is growing at a faster rate than CO_2 and thus responsible for the greenhouse effect ?

Select the mismatched pairs w.r.t. relative contribution of various green house gases to totral global warming: (a) CFCs - 20% (b) N_2O -6% © Carbon dioxide - 60% (d) Methane - 14%