Home
Class 11
BIOLOGY
Assertion : Obelia is dimorphic in natur...

Assertion : Obelia is dimorphic in nature
Reason : Obelia shows polyp and gonangia form

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 true 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:
A
Hydroid colony of Obelia is dimorphic, exhibiting two type of individuals or zooids which differ both morphologically as well as physiologically. These two zooids are -
(i) Polyps - the nutritive zooid of the colony
(ii) Gonangium - the reproductive zooid.
Promotional Banner

Topper's Solved these Questions

  • ANATOMY OF FLOWERING PLANTS

    ERRORLESS |Exercise Anatomy Of Flowering Plants|397 Videos

  • ANIMAL TISSUES

    ERRORLESS |Exercise Animal Tissues|408 Videos

Similar Questions

Explore conceptually related problems

Assertion (A): LiF is ionic in nature. Reason (R): Lil is covalent in nature.

Assertion : Keys are analytical in nature. Reason : Keys are based on couplet.

Assertion : Lecithin is important in membranes . Reason : It has amphipathic nature .

Assertion: tin(II) chloride is ionic and reducing in nature. Reason: Sn shows both +2 and +4 oxidation state.

Assertion: Photochemical smog is oxidising in nature. Reason: Photochemical smog contains NO_(2) and O_(3) which are formed during the sequence of reactions.

Assertion: Pinus embryo has two cotyledons. Reason: Pinus shows polymbryony.

ERRORLESS -ANIMAL KINGDOM-Animal Kingdom
  1. Assertion : Bats and whales are classified as mammals Reason : Bats ...

    Text Solution

    |

  2. Assertion : All birds, except the ones like koel (cuckoo) build nests ...

    Text Solution

    |

  3. Assertion : Obelia is dimorphic in nature Reason : Obelia shows poly...

    Text Solution

    |

  4. Assertion : Coelenterates shown altermation of generation. Reason : ...

    Text Solution

    |

  5. Assertion : Lateral line system is found in fishes and aquatic larval ...

    Text Solution

    |

  6. Assertion : F.hepatica undergoes both aerobic and anaerobic respiratio...

    Text Solution

    |

  7. Assertion : Plasmodium vivax is responsible for malaria. Reason : Ma...

    Text Solution

    |

  8. Assertion : Birds have one ovary. Reason : This reduces the body wei...

    Text Solution

    |

  9. Assertion : A shark can stay at a desired level in water without swinn...

    Text Solution

    |

  10. Assertion : Sponges belong to Porifera Reason : Sponges have canal s...

    Text Solution

    |

  11. Assertion : There is no chance of malaria to a man on the bite of male...

    Text Solution

    |

  12. Assertion : Cold blooded animals do not have fat layer. Reason : Col...

    Text Solution

    |

  13. Assertion : Acraniata is a group of organisms which do not have distin...

    Text Solution

    |

  14. Assertion : The skeleton of sponges is made up of spicules. Reason :...

    Text Solution

    |

  15. Assertion : Cephalization is advatageous to an animal Reason : It im...

    Text Solution

    |

  16. Assertion : Blood is colourless in the insects. Reason : Insect bloo...

    Text Solution

    |

  17. Assertion : Lophodont dentition is also found in the mammals Reason ...

    Text Solution

    |

  18. Assertion : Calabar swelling is caused by eye worm Reason : Loa loa ...

    Text Solution

    |

  19. Assertion : Metamerism is the characteristic of annelida Reason : Me...

    Text Solution

    |

  20. Assertion : Blood is red in annelida. Reason : RBCs are absent in th...

    Text Solution

    |