Home
Class 12
BIOLOGY
A : A few toxic substance often present ...

A : A few toxic substance often present in industrial waste waters undergo biological magnification.
R : A toxic substance can easily be metabolised or excreted by organism.

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:
A
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

What type of substances can easily dissolve in water?

Accumulation of toxic substance in living organism is called as :-

Most resistance biological material is Or An organic substance that can withstand enviornmental extremes and cannot be degraded by any enzyme is

Read the following statement (A) Biomagnification occurs because a toxic substance accumulated by an organism cannot be metabolismed or excreated and is thus passed on to the most higher trophic levels. (B) FOAM are responsible for the upkeep of the marshland developed in town of Arcala for integrated waste water treatment. (C) E.Coli indicates water pollution by faecal matter. Select the option for the set of all the correct statements.

Activated sludge should have the ability to settle quickly so that it can (a) be rapidly pumped back from sedimentation tank to aeration tank (b) absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank (c) be discarded and anaerobically digested (d) absorb colloidal organic matter

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Which one of the air pollutant is most toxic?

The technology used to clean environment by removing toxic substance from soil and water is called

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Acid rain is due to the increase in the concentration of . . . . . . . in the atmospheres

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Eutrophication causes reduction in

Assertion (A): In dilute benzene solutions, equimolar addition of R_(3)N and HCI produce a substance with a dipole moment. In the same solvent, equimolar addition of R_(3)N and SO_(3) produce a substance having an almost identical dipole moment. Reason (R) : Both HCI and SO_(3) are Lewis acids and can react with the amine base to form polar substances which undergo ionic dissociation in a solvent sufficiently more polar than benzene. Moreover, (N-S) bond is a more polar bond.

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

    |