Home
Class 12
BIOLOGY
Assertion : Atavism is the reappearance ...

Assertion : Atavism is the reappearance of disappeared ancestral characters.
Reason : Third molars and hair on body are examples of atavism.

A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B

If both the assertion and reason are ture but the reason is not a correct explanation of the assertion

C

If the assertion is true but the reason is false

D

If both the assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
C

Atavism is the appearance of certain ancestral characters which had either disppeared or were reduced. There are present some examples of atavism in human being, viz., the power of moving pinna in some persons, greatly developed canine teeth, exceptionally long dense hairs, short tail in some babies and presence of additional mammae in some individuals. third molars and hair on the body are examples of vestigeal organs.
Promotional Banner

Topper's Solved these Questions

  • COMMON HUMAN DISEASES

    ERRORLESS |Exercise Common Human Diseases|182 Videos
  • HEALTH AND DISEASE

    ERRORLESS |Exercise Health And Disease|122 Videos

Similar Questions

Explore conceptually related problems

Reappearance of certain ancestral characters is called

Define atavism. Give one example of atavism.

Sudden reappearance of certain ancestral chracters which had either disappeared or were reduced is known as

Assertion : All microsopic bodies in motion have wave character. Reason : Microscopic bodies have very large mass.

Appearance of profuse hairs on the body and face of iris dogman is an example of :

Assertion. In any reaction, the rate of disappearance of a reactant is same as the rate of reaction. Reason. Both rate of reaction and rate of disappearance of a reactant represent decrease in the concentration of a reactant per unit time.

ERRORLESS -EVOLUTION-Evolution
  1. Assertion : Darwin's finches show a variety of beaks and cactus seeds....

    Text Solution

    |

  2. Assertion : Grographical isolation brings about sympatric speciation. ...

    Text Solution

    |

  3. Assertion : Homo habilis was the first tool maker. Reason : He was c...

    Text Solution

    |

  4. Assertion : Formation of new species is called speciation. Reason : ...

    Text Solution

    |

  5. Assertion : Comparative biochemistry provides a strong evidence in fav...

    Text Solution

    |

  6. Assertion : Atavism is the reappearance of disappeared ancestral chara...

    Text Solution

    |

  7. Assertion : Evolution of man is the example of progresstive evolution....

    Text Solution

    |

  8. Assertion : Human ancestors never used their tails and so the tails ex...

    Text Solution

    |

  9. Assertion : Petrified fossils contain hard parts of organisms. Reaso...

    Text Solution

    |

  10. Geologically one of the following eras is known as "golden age of Rept...

    Text Solution

    |

  11. How many years are considered in one minute in Geological clock

    Text Solution

    |

  12. Species diversity generally increases as one proceeds from

    Text Solution

    |

  13. What is correct

    Text Solution

    |

  14. To be evolution of successful, a mutation must occur in

    Text Solution

    |

  15. Hardy and weinberg principle explaints

    Text Solution

    |

  16. In case of evolution which of the following statements is not correct

    Text Solution

    |

  17. Homeostasis is

    Text Solution

    |

  18. What does the term 'reproductive isolation' refers to

    Text Solution

    |

  19. When two related populations occupy geographically or spatially separa...

    Text Solution

    |

  20. Major radiation of mammals birds and pollinating insects took place in...

    Text Solution

    |