NEET 2009 Biology question

Not in NEET syllabus

Biochemical Oxygen Demand (BOD) in a river water:

(1)has no relationship with concentration of oxygen in the water.
(2)gives a measure of Salmonella in the water.
(3)increases when sewage gets mixed with river water.Correct
(4)remains unchanged when algal bloom occurs.

Answer: (3)

Solution

BOD is the amount of dissolved oxygen needed by bacteria to break down the organic matter present in a given volume of water. Sewage is rich in organic matter, so when it mixes with river water the microbes multiply and consume more oxygen: BOD increases and the

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Question ID VK-090208