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State PCS PYQPrelims 2023

UPPCS · प्रश्न 110

Biological Oxygen Demand (BOD) is a standard criterion for:

  1. Measuring O2 level in blood
  2. Pollution assay in aquatic ecosystems
  3. Assaying O2 level in high altitude regions
  4. Computing O2 level in forest ecosystems
उत्तर देखें और व्याख्या

उत्तर: (B) Pollution assay in aquatic ecosystems

व्याख्या

BOD measures oxygen needed by microbes to decompose organic matter in water, a key water-pollution index.