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 Green-house effect is due to thick layer of carbon dioxide. Reason The glass panels of a green-house allowing the sunlight to filter through but preventing the heat from being re-radiated in outer space.A) extinction of these species from other regions
B) continental separation
C) absence of terrestrial route to these places
D) retrogressive evolution
Correct Answer: B
Solution :
Caron dioxide is confined exclusively to the troposphere, the thick layer of \[C{{O}_{2}}\] in troposphere behaves like the glass panels of a green-house and allowing the sunlight to filter through but preventing the heat from being re-radiated in outer space. This is so called green-house effect. Carbon dioxide and water vapours absorb most heat present in atmosphere and add it to the heat which is already present. Thus, the net result is the warming up of the earths atmosphere.
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