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Home› UPSC CSE› Prelims GS Paper I› 2017 questions› Question 78

UPSC CSE Prelims

Subject: Environment & Ecology Chapter: Environmental Pollution

2017 PYQ

Question 78

Biological Oxygen Demand (BOD) is a standard criterion for

Choose one answer AMeasuring oxygen levels in blood BComputing oxygen levels in forest ecosystems CPollution assay in aquatic ecosystems DAssessing oxygen levels in high altitude regions

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Correct answer: C

Correct Option: C Explanation: Biochemical oxygen demand (BOD) quantifies oxygen consumed by microbes in breaking down organic matter in water; high BOD commonly signals organic pollution. Option-wise Analysis: A: Incorrect - Blood oxygen is measured through medical methods such as pulse oximetry or blood-gas analysis. B: Incorrect - Forest ecosystem oxygen flux is not the definition of BOD. C: Correct - Correct-BOD assesses organic pollution/load in aquatic systems. D: Incorrect - Altitude-related oxygen availability is a physiological/atmospheric issue, not BOD.

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