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In secondary sewage treatment, aerobic microbes grow into masses called:

ASludge
BGrit
CHumus
DFlocs
Answer & Solution
Correct answer: D. Flocs
1. Aeration tanks pump air into the effluent. 2. Bacteria and fungal filaments form flocs. 3. They consume organic matter and lower BOD. _Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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