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: Deforestation is one main factor contributing to global warming. Reason: Besides \[C{{O}_{2}}\], two other gases methane and CFCs are also included under greenhouse gases.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: B
Solution :
Carbon dioxide is a greenhouse gas. It is exclusively confined to the troposphere. In a normal situation, the temperature of earth is maintained by the energy balance of the sun rays which strike the planet and the amount of heat from being re-radiated to the surface of earth to the external environment. If, somehow, an increase in \[C{{O}_{2}}\] concentration happens, then the thick layer of this \[C{{O}_{2}}\] gas prevents the heat from being re-radiated out. This \[C{{O}_{2}}\] layer, thus, functions like a glass panels of a green house. This allows the sun light to pass out through it but does not allows the heat from being re-radiated back into the outer space. The net effect of green-house effect is the heating up of the earths surface. Removal of forests for the purpose of building construction and other similar purposes by humans, is called deforestation. That is a major factor contributing to global warming. \[C{{O}_{2}}\] contributes 57% part in green-house effect besides it CFCs 15%, methane 12%, nitrogen oxides 6% and 5% of water contribute to green-house effect.
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