Home
Class 12
BIOLOGY
Extinetion is a naturally occurring phen...

Extinetion is a naturally occurring phenomenon that has occurred on earth, since life began. Scientists are so concerned about extinction now because

A

human activities are directly responsible for today's mass extinctions

B

extinction is occurring faster than ever before and faster than rates of respeciation

C

large numbers of plant specics, which form the base of terrestrial food webs are becoming extinct

D

All of the above

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • BIODIVERSITY AND ITS CONSERVATION

    ARIHANT NEET|Exercise Section-B(Medical entrances special format questions)|13 Videos

  • BIODIVERSITY AND ITS CONSERVATION

    ARIHANT NEET|Exercise Section-C(Medical entrances gallery(Collection of questions asked in NEET & Various Medical Entrances Exams))|85 Videos

  • BIODIVERSITY AND ITS CONSERVATION

    ARIHANT NEET|Exercise Check point 25.3|20 Videos

  • BASIC CONCEPTS OF IMMUNOLOGY

    ARIHANT NEET|Exercise Medical entrances gallery|77 Videos

  • BIOLOGICAL CLASSIFICATION

    ARIHANT NEET|Exercise Chapter Exercises C Medical entrances gallery (Collection of Questions asked in NEET & Various Medical Entrance Exams )|21 Videos

Similar Questions

Explore conceptually related problems

_________ is a naturally occurring phenomenon that is responsible for the heating of the Earth's surface and atmosphere

The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of earth’s surface and atmosphere. Without greenhouse effect the average temperature at surface of earth would have been

Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. Does natural rubber has cis- or trans-configuration about the double bonds?

ARIHANT NEET-BIODIVERSITY AND ITS CONSERVATION -Chapter Exercise(Section A-(Taking it together))
  1. The only surviving habitat of the Asiatic lion is {:(,(a),"Gir Fores...

    Text Solution

    |

  2. Which one is a troublesome weed of agricultural fields ?

    Text Solution

    |

  3. Discovery of new species has recently picked up due to project

    Text Solution

    |

  4. The three levels of biodiversity are

    Text Solution

    |

  5. Which example below is not a threat to biodiversity?

    Text Solution

    |

  6. Which of the following factors does not play a role in increased biodi...

    Text Solution

    |

  7. The integration of several sciences such as ecology and genetics to su...

    Text Solution

    |

  8. Silent valley of Kerala is preserved because

    Text Solution

    |

  9. The key criteria for determining a hotspot are

    Text Solution

    |

  10. Most biodiversity zones are

    Text Solution

    |

  11. Susceptibility to extinction is due to

    Text Solution

    |

  12. Bald Eagle had been at high risk of extinction due to its

    Text Solution

    |

  13. Weeds are important as cultivated plants as they are

    Text Solution

    |

  14. Parthenium hysterophorus is a native of South America, but it grows lu...

    Text Solution

    |

  15. Introduction of Nile Perch in lake Victoria of South Africa resulted i...

    Text Solution

    |

  16. Genetic diversity is related to

    Text Solution

    |

  17. A species spread over a large tract with varied environmetal condition...

    Text Solution

    |

  18. Siberian Crane is a regular visitor of bird sanctuary

    Text Solution

    |

  19. Extinetion is a naturally occurring phenomenon that has occurred on ea...

    Text Solution

    |

  20. A survey was carried out to investigate the relationship between the h...

    Text Solution

    |