Home
Class 12
BIOLOGY
The colonisation of tropic pacific islan...

The colonisation of tropic pacific islands by humans have ' resulted in the extinction ' of more than _______________ species of native birds

A

2,000

B

3

C

4500

D

1000

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • BASIC CONCEPT OF IMMUNOLOGY

    USHA PUBLICATION|Exercise EXERCISE|141 Videos
  • BIOTECHNOLOGY & ITS APPLICATIONS

    USHA PUBLICATION|Exercise EXERCISE|76 Videos

Similar Questions

Explore conceptually related problems

Group of two more than two plant species is called as

Anthropogenic extinction is causing the ' sixth extinction ' . It is ______________ times more faster than the extinction which occurred in pre - human times .

Applying the Robert May's global estimate more than ______________ plant species and more than ______________ animals species is yet to be discovered and described in India .

Among the human ancestors the brain size was more than 1000 cc in :

Assertion : The Nile perch introduced into lake Victoria in east Africa led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake. Reason : When alien species are introduced deliberately for economic or other uses, they often become invasive and cause extinction of indigenous species. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Read the following statements with one or two blanks in each one of them. (i) A genus containing more than one species is called ______ genus, e.g., _______ . (ii) _______ is a collection of dried, pressed and preserved plants mounted on _________ sheets, properly labelled, systematically arranged and available for reference study. (iii) Living fossils are ancient organisms persisting in modern times _______ gradual morphological changes. (iv) A ________ is compreshensive treatise of a taxonomic group, generally a genus or a family, providing all taxonomic data related to that group. Which of the following correctly fills any two of the above statements ?

Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichild fish in the lake Victoria of E.Africa ? (a) Catla catla (b) Dog fish (c) Nile perch (d) African catfish

Assertion :Species with low genetic variability are generally at greater risk of extinction than the species with more genetic variability. Reason: Species with low genetic variability are more vulnerable to disease, predators or other environmental challenges.

Introduction of alien species into new area poses a threat to extinction of indigenous species due to (a) their high nutrient requirement (b) their symbiotic relationship (c) absence of their natural predators (d) more intraspecific competition.

In the tropical rainforest, the majority of trees have showy animal-pollinated flowers. In temperate forests the majority of trees are wind pollinated. Which factors best explain these contrasting patterns ? (i) Wind is rare in tropical forests. (ii) Because of high species diversity in the tropics, individuals of trees species are often widely separated making wind an inefficient means of pollen dispersal. (iii) More opportunities for coevolved mutualisms exist in tropical forests because of the high diversity of animal species. (iv) Trees in tropical forests are mostly evergreen and year-round leaf canopies impede pollen dispersal by wind. (v) Flowering in tropical forests occurs over a short period of time when wind is absent. (a) (i) , (ii) and (v) (b) (i),(iii) and (v) (c) (ii), (iii) and (iv) (d) (ii) and (iv)

USHA PUBLICATION-BIODIVERSITY & CONSERVATION -ECERCISE
  1. Anthropogenic extinction is causing the ' sixth extinction ' . It is ...

    Text Solution

    |

  2. The IUCN . Red list ( 2004 ) documents the extinction of ( A ) species...

    Text Solution

    |

  3. The colonisation of tropic pacific islands by humans have ' resulted i...

    Text Solution

    |

  4. Which of the following has undergone recent extinctions ?

    Text Solution

    |

  5. Following mass extinctions , recovery to the same level of biodiversit...

    Text Solution

    |

  6. Which of the following term includes all of the others ?

    Text Solution

    |

  7. Which of the following groups is most , threatened by global extinctio...

    Text Solution

    |

  8. Which term did Edward Osborne Wilson coin for our innate appreciation ...

    Text Solution

    |

  9. We should care about loss in biodiversity in the populations of other ...

    Text Solution

    |

  10. The most serious consequence of a decrease in global diversity would b...

    Text Solution

    |

  11. The most direct threat to biodiversity is :

    Text Solution

    |

  12. Introduced species can have deleterious effects on biological communit...

    Text Solution

    |

  13. Agricultural lands frequently require nutrient augmentation because :

    Text Solution

    |

  14. IUCN has its headquarters at :

    Text Solution

    |

  15. Which among the following category is most threatened ?

    Text Solution

    |

  16. Biodiversity act of India was passed in .

    Text Solution

    |

  17. The Critically Endangered and vulnerable plant species are respectivel...

    Text Solution

    |

  18. Arrange the following red - list categories provided by IUCN from high...

    Text Solution

    |

  19. The headquarter of IUCN - Red list is in

    Text Solution

    |

  20. The art of extracting metals from their ores is called ……………

    Text Solution

    |