Home
Class 12
BIOLOGY
When domestic sewage mixes with river wa...

When domestic sewage mixes with river water

A

The increased microbial activity releases micro-nutrients such as iron.

B

The increased microbial activity used up dissovled oxygen.

C

The river water is still suitable for drinking as impurities are only about 0.1%.

D

Small animals like rats will die after drinking river water.

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • ORGANISM & ENVIRONMENT AND DEMOGRAPHY

    ALLEN|Exercise EXERCISE-III|110 Videos

  • ORGANISM & ENVIRONMENT AND DEMOGRAPHY

    ALLEN|Exercise Assertion and Reason|26 Videos

  • ORGANISM & ENVIRONMENT AND DEMOGRAPHY

    ALLEN|Exercise EXERCISE-I|127 Videos

  • NEURAL CONTROL AND COORDINATION

    ALLEN|Exercise Questions|61 Videos

  • ORGANISM AND POPULATION (ECOLOGY)

    ALLEN|Exercise S|26 Videos

Similar Questions

Explore conceptually related problems

Domestic sewage of large cities

A river with an inflow of domestic sewage rich in organic waste may result in

A river with an inflow of domestic sewage rich in organic waste may result in

A lake with an inflow of domestic sewage rich in organic waste may result in

A lake with an inflow of domestic sewage rich in organic waste may result in

If hot water is mixed with cold water

Explain why some times foaming is seen in river water near the place where sewage water is poured after treatment ?

A man crosses the river perpendicular to river in time t seconds and travels an equal distance down the stream in T seconds. The ratio of man's speed in still water to the river water will be:

Assertion: When cement is mixed with water and left as such, it becomes hard mass. Reason: Setting of cement is exothermic process.

What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.

ALLEN-ORGANISM & ENVIRONMENT AND DEMOGRAPHY-EXERCISE-II
  1. Which of the following representations shows the pyramid of numbers i...

    Text Solution

    |

  2. Which one of the following is a xerophytic plant in which the stem is ...

    Text Solution

    |

  3. When domestic sewage mixes with river water

    Text Solution

    |

  4. Which one of the following is most appropriately defined ?

    Text Solution

    |

  5. The Indian Rhinoceros is a natural inhabitant of which one of the I...

    Text Solution

    |

  6. According to Euro - IV norms , the quantity of sulphur in petrol and d...

    Text Solution

    |

  7. Crustose lichens, those invaded barren bland, first of all, are:-

    Text Solution

    |

  8. Mass of living matter at a trophic level in an area at any time is cal...

    Text Solution

    |

  9. Eutrophication is often seen in

    Text Solution

    |

  10. Of the total incident solar radiation the proportion of PAR is

    Text Solution

    |

  11. Which one of the following pairs of gases are the major cause of "Gree...

    Text Solution

    |

  12. Secondary sewage treatment is mainly a:

    Text Solution

    |

  13. Which of the following is mainly produced by the activity of anaerobic...

    Text Solution

    |

  14. Which one of the following have the highest number of species in natur...

    Text Solution

    |

  15. Large woody Vines are more commonly found in

    Text Solution

    |

  16. Nitrifying bacteria

    Text Solution

    |

  17. Consider the following four conditions (i-iv) and select the correct p...

    Text Solution

    |

  18. Which one of the following statements is correct for secondary success...

    Text Solution

    |

  19. Which one of the following is categorised as a parasite in true sence ...

    Text Solution

    |

  20. Which one of the following statements for pyramid of energy is incorre...

    Text Solution

    |