A high biological oxygen demand (bod) indicates options
a.Absence of microbial action
b.Low level of microbial pollution
c.Water is pure
d.High level of microbial pollution
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Ans is D
Explanation- BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water.
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hii dud my ans is Option D bcs high microbial pllution will harm the ecosystem
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