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How much amount of dissolved oxygen does gravely polluted water consists of?

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in Biology – Class 12 by (271k points)
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 ppm

The question was asked in homework.

This is a very interesting question from Environmental Issues topic in chapter Environmental Issues of Biology – Class 12

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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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