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(D) The correct matches are as follows:$(1)$ $DDT$ is a non-biodegradable pesticide that undergoes $(r)$ Biological magnification in food chains.$(2)$

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$(1)-(r), (2)-(q), (3)-(s), (4)-(p)$

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(D) The correct matches are as follows:$(1)$ $DDT$ is a non-biodegradable pesticide that undergoes $(r)$ Biological magnification in food chains.$(2)$ $PAN$ (Peroxyacetyl nitrate) is a secondary pollutant associated with $(q)$ Smog formation.$(3)$ Acid rain is primarily caused by the emission of $(s)$ $SO_2$ (Sulfur dioxide) and nitrogen oxides.$(4)$ Global warming is primarily caused by the increase in greenhouse gases like $(p)$ $CO$ and $CO_2$.Therefore,the correct sequence is $(1)-(r), (2)-(q), (3)-(s), (4)-(p)$.

Match the following and choose the correct combination from the options given:
Column $I$ | Column $II$
$(1)$ $DDT$ | $(p)$ $CO, CO_2$
$(2)$ $PAN$ | $(q)$ Smog
$(3)$ Acid rain | $(r)$ Biological magnification
$(4)$ Global warming | $(s)$ $SO_2$

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Match the following and choose the correct combination from the options given:Column $I$ | Column $II$$(1)$ $DDT$ | $(p)$ $CO, CO_2$$(2)$ $PAN$ | $(q)$ Smog$(3)$ Acid rain | $(r)$ Biological magnification$(4)$ Global warming | $(s)$ $SO_2$