Consider the following sentences: I. Anaerobic bacteria and fungi form mesh-like structures. II. Bacteria and fungi form a mesh-like structure in an air-contained sludge digester tank. III. Mixture of

Question

Consider the following sentences: I. Anaerobic bacteria and fungi form mesh-like structures. II. Bacteria and fungi form a mesh-like structure in an air-contained sludge digester tank. III. Mixture of gases IV. Primary sludge before biological treatment Select the right option for flocs-

Accepted Answer

Answer: Only II — According to NCERT, flocs are formed during the biological (secondary) treatment of sewage in the aeration tank, where air is continuously pumped. In this oxygen-rich environment, aerobic bacteria gro

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