Home
Class 12
BIOLOGY
Assertion : There is a sharp decline in ...

Assertion : There is a sharp decline in dissolved oxygen downstream from the point of sewage discharge.
Reason : Microoganisms ionvolved in biodegradation or organic matter in the receiving water body consume a lot of oxygen.

A

If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.

B

If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion

C

If Assertion is True but the Reason if False.

D

If both Assertion `&` Reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • ORGANISM & ENVIRONMENT AND DEMOGRAPHY

    ALLEN|Exercise EXERCISE-III|110 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

Assertion: Sewage discharge in a water body causes eutrophication. Reason: This increases the organic content in water body and, hence, the growth of algal blooms.

The amount of oxygen that would be consumed if the all organic matter in one liter of water oxidised by bacteria is called ?

Assertion : Gold and silver are extracted from their native ores by leaching. Reason : Both silver and gold particles dissolve in dilute solution of sodium cyanide in presence of oxygen.

Assertion: Amount of biodegradable organic matter present in water is measured by BOD of water Reason: During biodegradation of organic compounds. Oxygen is released

Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

ALLEN-ORGANISM & ENVIRONMENT AND DEMOGRAPHY-Assertion and Reason
  1. Assertion: Competition always occurs between closely related species c...

    Text Solution

    |

  2. Assertion: Female mosquito is not considered as parasite although it ...

    Text Solution

    |

  3. Assertion: Decomposition is one of the most vital functional attribute...

    Text Solution

    |

  4. Assertion: Temperature and soil moisture are the important climatic fa...

    Text Solution

    |

  5. Assertion: In Terrestrial, ecosystem much larger fraction of energy fl...

    Text Solution

    |

  6. Assertion:-Detritus food chain may be connected with grazing food chai...

    Text Solution

    |

  7. Assertion: Climax community is in near equilibrium with the environmen...

    Text Solution

    |

  8. Assertion: Biodiversity and its conservation are vital environmental i...

    Text Solution

    |

  9. Assertion: There is no clearcut estimation about biodiversity of proka...

    Text Solution

    |

  10. Assertion: Removal of key stone species from any ecosystem leads to de...

    Text Solution

    |

  11. Assertion: Introduction of alien species is responsible for extinction...

    Text Solution

    |

  12. Assertion: Co-extinction is also one of the evil quartet about biodive...

    Text Solution

    |

  13. Assertion: Sacred groves are also one of the mean of ex-situ conservat...

    Text Solution

    |

  14. Assertion : An electrostatic precipitator (ESP) is a particulate colle...

    Text Solution

    |

  15. Assertion : There is a sharp decline in dissolved oxygen downstream fr...

    Text Solution

    |

  16. A : A few toxic substance often present in industrial waste waters und...

    Text Solution

    |

  17. Assertion:- During integrated waste water treatment in town of Arcata ...

    Text Solution

    |

  18. Assertion: Excess of ozone in troposphere called bad ozone while exces...

    Text Solution

    |

  19. [A] : Suspended particulate matter (SPM) is an important pollutant rel...

    Text Solution

    |

  20. Assertion (A) : Presently, the global atmosphere is warming up. Reas...

    Text Solution

    |