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In sewage treatment, the "flocs" formed in aeration tanks are
A{'text': 'Colonies of methanogens that produce methane anaerobically', 'label': 'A'}
B{'text': 'Fine sediments of settled soil and small grit particles', 'label': 'B'}
C{'text': 'Masses of activated sludge with fungal filaments and bacteria', 'label': 'C'}
D{'text': 'Insoluble layers of surface oil and greasy hydrocarbon films', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Masses of activated sludge with fungal filaments and bacteria', 'label': 'C'}
1. During secondary treatment, aerated tanks let aerobic microbes multiply.
2. NCERT describes flocs as masses of bacteria associated with fungal filaments forming mesh-like structures.
3. Flocs consume organic matter in the effluent, reducing BOD.
4. After BOD drops, flocs settle in a settling tank as "activated sludge".
_Source: NCERT Class 12 Biology, Ch 8 "Microbes in Human Welfare", §8.3_
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