Paper 1 · People, Development & Environment
UGC NET 03rd Jan 2026 Shift 1
The oxygen consumed in the oxidation of an organic compound by microorganisms in the aquatic ecosystem is called __________.
ADissolved oxygen
BChemical oxygen demand
CTheoretical oxygen demand
DBiochemical oxygen demand ✓ Correct
Answer: D
Explanation
★The oxygen that microorganisms use to break down organic matter in water is the biochemical oxygen demand, a standard measure of organic pollution in water.
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