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What are flocs? Discuss their role in se...

What are flocs? Discuss their role in sewage treatment.

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Flocs are large masses of semidecayed organic waste and microbes surrounded by slime. They settle down at the bottom of sewage tanks and act as secondary or activated sludge. They are used as inoculum and also as anaerobic digesters for biogas generation.
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ICSE-MICROBES IN HUMAN WELFARE-COMPETITION CORNER (OBJECTIVE TYPE QUESTIONS (ASSERTION AND REASON TYPE QUESTIONS))
  1. What are flocs? Discuss their role in sewage treatment.

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  2. Assertion: Discovery of penicillin by Alexander Flemming was a serendi...

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  3. Assertion: BOD indicates the extent of water pollution by organic wast...

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  4. Assertion: Polyhedrovirus is called a baculovirus. Reason: Nucleo...

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  5. Assertion: Anabaena is commonly called a symbiotic biofertiliser. ...

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  6. Assertion: Only Lactobacillus lactis causes curdling of milk. Rea...

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  7. Assertion: Insulin is a type of antibiotic. Reason: Insulin is sy...

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  8. Assertion: Rotenone is a bioinsecticide. Reason: Rotenone is obta...

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  9. Assertion: Chemical fertilisers and pesticides are not only expensive ...

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  10. Assertion: Azolla pinnata is used as biofertiliser in rice cultivation...

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  11. Assertion: Neem is used as a natural insecticide. Reason: The ne...

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  12. Assertion: Most of the orchids are dependent on fungi in seedling stag...

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  13. Assertion: Biofertilisers are preferred to chemical fertilisers. ...

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  14. Assertion: Leguminous plants are the best preferred for crop rotation....

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  15. Assertion: Use of fertilisers greatly enhances crop productivity. ...

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  16. Assertion: Nitrogen-fixing bacteria of legume nodules live in O2 depl...

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