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(A) Statement $(1)$ is True: $CO_2$ is the major greenhouse gas contributing approximately $60\%$ to global warming.Statement $(2)$ is True: Deforesta

Vedclass · Accepted Answer

$TTFT$

Vedclass · Answer

(A) Statement $(1)$ is True: $CO_2$ is the major greenhouse gas contributing approximately $60\%$ to global warming.Statement $(2)$ is True: Deforestation contributes to the greenhouse effect by reducing the carbon sink (trees) and increasing $CO_2$ levels.Statement $(3)$ is True: Without the greenhouse effect,the Earth's average temperature would be $-18^oC$. Due to the greenhouse effect,it is maintained at $15^oC$.Statement $(4)$ is False: The concentration of $DDT$ in water is $0.003\ ppb$,in zooplankton it is $0.04\ ppm$,and in small fish,it is $0.5\ ppm$. Therefore,the value $0.05\ ppm$ is incorrect.Thus,the correct sequence is $TTFT$.

Column - $I$	Column - $II$
$(1)$ Nitrous oxide	$(a)$ Secondary pollutant from car exhaust.
$(2)$ Chlorofluorocarbons	$(b)$ Combustion of fossil fuels,wood etc.
$(3)$ Methane	$(c)$ Denitrification
$(4)$ Ozone	$(d)$ Refrigerators,aerosols,sprays
$(5)$ Carbon dioxide	$(e)$ Cattle,rice fields,toilets

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