NEET 2015 Biology question

Not in NEET syllabus

High value of BOD (Biochemical Oxygen Demand) indicates that :-

(1)Water is highly pollutedCorrect
(2)Water is less polluted
(3)Consumption of organic matter in the water is higher by the microbes
(4)Water is pure

Answer: (1)

Solution

BOD is the amount of oxygen that microbes consume in oxidising the organic matter in a water sample (measured in a fixed time, usually 5 days at ). The more organic (biodegradable) matter present, the more oxygen the microbes need, so a high BOD

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Question ID VK-091711