Massachusetts Soil Evaluator Practice Test 2026

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BOD stands for Biochemical Oxygen Demand. Which option correctly describes BOD?

Biological oxygen demand

Bor on oxide demand

Biochemical oxidation device

Biochemical oxygen demand, which is the amount of oxygen required to oxidize all organic matter

BOD measures how much oxygen microorganisms need to biologically break down organic matter in water. This tells you how much oxygen could be consumed by biological processes if the water sewer or effluent enters a body of water, indicating the potential impact on aquatic life and the level of organic pollution.

The description that BOD is the amount of oxygen required to oxidize all organic matter captures that idea—the test quantifies the oxygen demand from biological oxidation of biodegradable organic material under standardized conditions (often over five days at 20°C).

The other descriptions aren’t correct for BOD: one changes the term to a nonstandard “Biological Oxygen Demand,” another is a misspelled term, and a third describes a device rather than the oxygen-demand concept.