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Q.

The condition that indicates a polluted environment is.

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a

pH of rain water to be 5.6

b

eutrophication

c

0.03% of  CO2 in the atmosphere

d

BOD value of 5 ppm

answer is B.

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Detailed Solution

Eutrophication is causing water pollution water overly enrched with minerals nutrients Which induce excessive growth of algae this process may result in oxygen content of water (D-O) decreased
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