Home
Class 12
BIOLOGY
Name two groups of organisms which const...

Name two groups of organisms which constitute 'flocs'. Write their influence on the level on BOD during biological treatment of sewage.

Text Solution

Verified by Experts

The floc is made up of masses of bacteria associated with fungel filaments to form mesh like structures. These microbes consume organic matter in the primary effluent and reduce the BOD.
Promotional Banner

Topper's Solved these Questions

  • XII BOARDS

    XII BOARDS PREVIOUS YEAR|Exercise OUTSIDE DELHI 2014 SET -I [COMPTT]|6 Videos

  • XII BOARDS

    XII BOARDS PREVIOUS YEAR|Exercise OUTSIDE DELHI SET II|15 Videos

  • XII BOARDS

    XII BOARDS PREVIOUS YEAR|Exercise SET-III Section E|2 Videos

  • SAMPLE PAPER 2019

    XII BOARDS PREVIOUS YEAR|Exercise Section E Part B|3 Videos

Similar Questions

Explore conceptually related problems

Name the groups which constitute s-block elements.

Name any two groups of microorganisms from which antibiotics could be extracted.

Name two types of skeletal tissues which constitute the rigid skeleton in animals.

Group of organisms in which cell wall froms two thin overlapping shells are

Name that group of organisms which does not fit neatly into any scheme of classification

Write the names of four levels of biological organisation.

Name the two bones which constitute each half of the pectoral girdle .

Name any two organisms which can occupy more than one trophic level in an ecosystem.

Define haemocoel. Name two groups of animals in which it is present.

Name two things that can be made from sludge extracted during treatment of sewage.

XII BOARDS PREVIOUS YEAR-XII BOARDS-SET 1 [COMPTT]
  1. Differentiate between active immunity and passive immunity.

    Text Solution

    |

  2. Differentiate between outbreeding and outcrossing.

    Text Solution

    |

  3. Name two groups of organisms which constitute 'flocs'. Write their inf...

    Text Solution

    |

  4. why is making cells competent essential for biotechnology experiments?...

    Text Solution

    |

  5. Human insulin when synthesised in the body needs to be processed befor...

    Text Solution

    |

  6. Write any two ways how genetically modified plants are found to be use...

    Text Solution

    |

  7. Provide two reasons that make the cound of prokaryotic species difficu...

    Text Solution

    |

  8. Explain how does the inflow of large amount of nutrients like phosphat...

    Text Solution

    |

  9. How is apomixis different from parthenocarpy ?

    Text Solution

    |

  10. Describe any two modes by which apomictic seeds and be produced.

    Text Solution

    |

  11. Why is haemophilia rare in human females ? Mention a clinical symptom ...

    Text Solution

    |

  12. What are the transcriptional products of RNA polymerase III?

    Text Solution

    |

  13. Differentiate between 'Capping' and 'Taling'.

    Text Solution

    |

  14. Expand hrRNA.

    Text Solution

    |

  15. Giving three reasons, write how Hardy-Weinberg equilibrium can be affe...

    Text Solution

    |

  16. Do you support 'Dope' test being conducted on sportspersons perticipat...

    Text Solution

    |

  17. Suggest and describe a technique through which a virus-free healthy pi...

    Text Solution

    |

  18. How are Baculoviruses and Bacillus thuringiensis use as bio-control a...

    Text Solution

    |

  19. Draw a schematic diagram of the E. coli cloning vector Pbr322 and mar...

    Text Solution

    |

  20. Draw schematic diagrams of segments of a vector and a foreign DNA with...

    Text Solution

    |