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How much amount of dissolved oxygen does gravely polluted water consists of?(a) 20 ppm(b) 8 ppm(c) Above 4 ppm(d) Below 4 ppmThe question was asked in homework.This is a very interesting question from Environmental Issues topic in chapter Environmental Issues of Biology – Class 12

Answer»

Right option is (d) Below 4 ppm

To explain I would say: The water with the maximum AMOUNT of pollution is known as gravely polluted water. The dissolved OXYGEN does gravely polluted water is below 4 ppm. Very few aquatic ANIMALS can survive in this water.



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