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19/09/2020 7:51 pm
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The condition that indicates a polluted environment is :
(1) 0.03% of CO2 in the atmosphere
(2) eutrophication
(3) pH of rain water to be 5.6
(4) BOD value of 5 ppm
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19/09/2020 7:52 pm
(2) eutrophication
Explanation:
(2) Clean water would have B.O.D value of less than 5 ppm whereas highly polluted water cloud have a B.O.D value of 17 ppm or more.
(3) The process in which nutrient enriched water bodies support a dense plant population which kill animal life by depriving it of oxygen results in subsequent loss of biodiversity is known as Eutrophication.
(4) If the concentration of dissolved oxygen of water is below 6 ppm, the growth of fish get inhibited.