Which of the following conditions shows ...

Which of the following conditions shows the polluted enviorment ?

pH of rain water is 5.6

amount of carbon dioxide in the atmosphere is 0.03%

biochemical oxygen demand is 10 ppm

eutrophication

Text Solution

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The correct Answer is:

C, D

Biochemical oxygen demand greater than 5 ppm shows water is polluted. Eutrophication, i.e. flow of phosphatic fertilizers waste into lakes, resulting into the death of fish is pollution of water

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Which of the following condition show polluted environment ?

Eutrophication

BOD is 4 ppm

pH of rain water is 5.6

Amount of `CO_(2)` in the atmosphere is 0.03%

Which of the following conditions shows the effect of photo-stratification?

Profundal zone has both heterotrophs and phytoplanktons.

Profundal zone harbors only heterotrophs.

Planktons are only found in littoral zone.

Heterotrophs are maximum in limnetic zone.

Which of the following is not a water pollutant ?

Fine sand

Algae

Fertilizers

CFCs