NEET 2016 Phase 2 · BiologyPrevious Year Question
Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from
Answer: (C) Petroleum industry. Answer: (C) Petroleum industry Solution: BOD measures only the biodegradable (organic) load oxidised by microbes.
- A.Domestic sewage
- B.Dairy industry
- C.Petroleum industry✓
- D.Sugar industry
Correct Answer
(C) Petroleum industry
Solution & Explanation
Answer: (C) Petroleum industry Solution: BOD measures only the biodegradable (organic) load oxidised by microbes. Petroleum-industry effluent is largely non-biodegradable, so the BOD test underestimates its true pollution and is not a good index for it. Domestic sewage, dairy and sugar industry effluents are rich in biodegradable organic matter, so BOD reflects their pollution well. NCERT Reference: Ch 8, p.154, line 29 — "indirectly, BOD is a measure of the organic matter present"
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