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State PCS PYQPrelims 2023

UPPCS · Question 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
Show answer & explanation

Answer: (B) Pollution assay in aquatic ecosystems

Explanation

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