NEET Biology question

Biology Environmental Issues NEET

Not in NEET syllabus

A water sample collected downstream of a sewage outlet shows an extremely high BOD and very low dissolved oxygen, and supports almost no fish life. The most reasonable inference is that the water is

(A)Heavily polluted with biodegradable organic matterCorrect
(B)Exceptionally pure and well-oxygenated
(C)Free of all microbial activity
(D)Rich in dissolved methane only, with no organic pollutants

Answer: (A)

Solution

A very high BOD combined with low dissolved oxygen indicates heavy organic pollution, since microbes consume large

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Question ID VK-124380