Biological Oxygen Demand (BOD) is a standard criterion for

[amp_mcq option1=”Measuring oxygen levels in blood” option2=”Computing oxygen levels in forest ecosystems” option3=”Pollution assay in aquatic ecosystems” option4=”Assessing oxygen levels in high altitude regions” correct=”option3″]

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UPSC IAS – 2017

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The correct answer is C) Pollution assay in aquatic ecosystems.

Biological Oxygen Demand (BOD) is a measure used to indicate the amount of dissolved oxygen consumed by microorganisms in a water sample while they decompose organic matter under aerobic conditions. It is a standard test for assessing the level of organic pollution in water bodies.

High BOD values indicate that there is a large amount of biodegradable organic material in the water, which consumes a significant amount of dissolved oxygen as it decomposes. This depletion of oxygen can harm aquatic life. Therefore, BOD is a crucial parameter in evaluating the quality of water and the extent of pollution in rivers, lakes, and other aquatic ecosystems. Options A, B, and D relate to oxygen levels in blood, forests, or high altitudes, which are not measured by BOD.

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