State PCS PYQPrelims 2023

UPPCS · প্রশ্ন 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
উত্তর দেখান ও ব্যাখ্যা

উত্তর: (B) Pollution assay in aquatic ecosystems

ব্যাখ্যা

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