Civil Services Prep

Prelims 2017 · Environment · Question 9

Biological Oxygen Demand (BOD) is a standard criterion for

  1. Measuring oxygen levels in blood
  2. Computing oxygen levels in forest ecosystems
  3. Pollution assay in aquatic ecosystems
  4. Assessing oxygen levels in high altitude regions

Answer

Pollution assay in aquatic ecosystems

  • (a) Measuring oxygen levels in blood: Incorrect. Blood oxygen is measured by parameters like SpO2 or blood oxygen saturation, not BOD.
  • (b) Computing oxygen levels in forest ecosystems: Incorrect. BOD is not used for forests; it is mainly a water quality indicator.
  • (c) Pollution assay in aquatic ecosystems: Correct. Biological Oxygen Demand (BOD) measures the oxygen required by microorganisms to decompose organic matter in water, so it is a standard index of organic pollution in aquatic ecosystems.
  • (d) Assessing oxygen levels in high altitude regions: Incorrect. High-altitude oxygen assessment relates to atmospheric oxygen/air pressure, not BOD.
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