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a
insoluble organic matter and soluble organic matter.
b
anaerobic fungi and bacteria.
c
aerobic fungi and bacteria.
d
aerobic fungi and anaerobic bacteria.
answer is C.
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Detailed Solution
Flocs are mesh of filamentous fungi and bacteria formed in aeration tank due to degradation of dissolved organic matter. These are aerobes and settled as activated sludge in secondary settling tank.