Fill in the blanks:
$(1)$ $A$ special cloud is formed over the Antarctica region in winter,which is called ..............
$(2)$ $A$ known source of pollution is called ..............
$(3)$ An unknown source of pollution is called ..............
$(4)$ The concentration of dissolved oxygen in water is ......... and the concentration of dissolved oxygen in air is ............
$(1)$ $A$ special cloud is formed over the Antarctica region in winter,which is called ..............
$(2)$ $A$ known source of pollution is called ..............
$(3)$ An unknown source of pollution is called ..............
$(4)$ The concentration of dissolved oxygen in water is ......... and the concentration of dissolved oxygen in air is ............
(N/A) $(1)$ Polar stratospheric clouds
$(2)$ Point source
$(3)$ Non-point source
$(4)$ $10 \ ppm, 2,00,000 \ ppm$
$(2)$ Point source
$(3)$ Non-point source
$(4)$ $10 \ ppm, 2,00,000 \ ppm$
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In the light of the above statements,choose the most appropriate answer from the options given below:
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DifficultJEE MAIN 2023
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