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Assertion : Deforestation is one main factor contributing to global warming.

Reason : Besides CO2, two other gases methane and CFCs are also included under green house gases.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

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Correct option (b) 

Explanation :

Deforestation increases atmospheric CO2 content by releasing carbon stored in organic matter and reduced primary productivity. So deforestation is one of the main factors contributing to global warming other than green house gases. The various green house gases are CO2 (60% effect), CH4 (20% effect) CFCs (14% effect) and nitrogen oxide (N2O, 6% effect). Due to increase of CO2 concentration, the absorption of heat radiation also increase thus increasing the temperature. This increase in temperature ma)- causes melting of glacier and polar ice caps. which is called global warming. This melting of glaciers and polar ice results in raising the sea level. Actually these green house gases absorbs infra red radiations (heat) of the sun like glass and thus traps the heat and does not allow it to radiate back to the space. They instead radiate the heat back to earth, thus causing increase in temperature.

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