| $List-I$ (Pollutant) | $List-II$ (Source) |
| $A$. Microorganisms | $I$. Strip mining |
| $B$. Plant nutrients | $II$. Domestic sewage |
| $C$. Toxic heavy metals | $III$. Chemical fertilizer |
| $D$. Sediment | $IV$. Chemical factory |
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| List-$I$ | List-$II$ |
| $(A)$ Phosphate fertilizers in water | $(1)$ Increases $BOD$ value of water |
| $(B)$ Methane in air | $(2)$ Acid rain |
| $(C)$ Synthetic detergents in water | $(3)$ Global warming |
| $(D)$ Nitrogen oxides in air | $(4)$ Eutrophication |
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