alleryThe amount of biodegradable organic matter in sewage is estimated by measuring:
AAcidity of the water
BSalt concentration
CTurbidity of the water
DBiochemical oxygen demand
Answer & Solution
Correct answer: D. Biochemical oxygen demand
1. Microbes use oxygen to break down organic matter.
2. More organic matter means more oxygen demanded.
3. So BOD measures the biodegradable load.
_Source: syllabus Biology, Chapter 16, Environmental Issues._
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