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The amount of biodegradable organic matter in sewage is estimated by measuring:

ADissolved carbon dioxide
BTotal suspended solids
CWater hardness index
DBiochemical Oxygen Demand
Answer & Solution
Correct answer: D. Biochemical Oxygen Demand
1. Microbes consume oxygen as they decompose the matter. 2. This is measured as BOD. 3. Higher BOD means more organic pollution. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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