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BOD stands for biochemical oxygen:

ADeficit
BDensity
CDosage
DDemand
Answer & Solution
Correct answer: D. Demand
1. It measures how much oxygen bacteria would use. 2. The measure is a requirement, not a shortage. 3. So BOD is biochemical oxygen demand. 4. The answer is demand. _Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_
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