AIPMT PRELIMS 2009 Botany Water Pollution MCQ Question
Biochemical Oxygen Demand (BOD) in a river water:
has no relationship with concentration of oxygen in the water.
gives a measure of salmonella in the water.
increases when sewage gets mixed with river water.
remains unchanged when algal bloom occurs.
Correct Answer
Detailed Explanation
BOD increases when organic matter, such as sewage, is present in water, as it requires oxygen for decomposition, reducing the oxygen available for aquatic life.
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