Home
Class 12
BIOLOGY
Assertion The coelenteron of Hydra is ca...

Assertion The coelenteron of Hydra is called gastrovascular cavity.
Reason Hydra is a monoblastic animal.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

C

Assertion is true, but Reason is False

D

Assertion is false, but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
C
The wall of cylinderical body of Hydra surrounds a central cavity called coelenteron or gastrovascular cavity. This cavity communicates with the exterior through the mouth .This is named so, because water currents in the coelenteron performs all the functions of circulatory system in addition to the functions of digestive cavity. Its body wall is composed of two layers -epidermis and gastrodermis separated by a non-cellular layer (mesogloea).
Promotional Banner

Topper's Solved these Questions

  • ANIMALIA -I (LOWER INVERTEBRATES)

    ARIHANT NEET|Exercise CHAPTER EXERCISES (Taking it together) medical entrances gallery (Collection of Questions Asked in NEET & in various Entrance Exams))|68 Videos

  • ANIMALIA -I (LOWER INVERTEBRATES)

    ARIHANT NEET|Exercise CHAPTER EXERCISES (Taking it together) Medical entrances special format questions (Match the Columns)|13 Videos

  • ANIMAL TISSUES

    ARIHANT NEET|Exercise CHANPTER EXERCISES (MEDICAL ENTRANCES GALLERY)(COLLECTION OF QUESTIONS ASKED IN NEET & VARIOUS MEDICAL ENTRANCE EXAMS)|63 Videos

  • ANIMALIA-II (HIGHER INVERTEBRATES)

    ARIHANT NEET|Exercise Chapter Exercises C Medical entrances gallery (Collection of questions Asked in NEET & Various Medical Entrance Exams )|1 Videos
ARIHANT NEET-ANIMALIA -I (LOWER INVERTEBRATES)-CHAPTER EXERCISES (Taking it together) Medical entrances special format questions (Assertion and reason)
  1. Assertion(A): In sponges, archaeocytes are totipotent. Reason( R): T...

    Text Solution

    |

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

    Text Solution

    |

  3. Assertion Spongilla and Leucosolenia are structurally similar sponges ...

    Text Solution

    |

  4. Assertion Sponges are less specialised ones. Reason Sponges show lea...

    Text Solution

    |

  5. Assertion : Sponges do not show any animal nature. Reason : Sponges ...

    Text Solution

    |

  6. Assertion In Hydra, both pseudopodia and flagella occur in sensory ce...

    Text Solution

    |

  7. Assertion The coelenteron of Hydra is called gastrovascular cavity. ...

    Text Solution

    |

  8. Assertion Medusa of Obelia is carnivorous . Reason Digestion is bot...

    Text Solution

    |

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

    Text Solution

    |

  10. Assertion Hydatid vesicle is the characteristic of Echinococcus for ab...

    Text Solution

    |

  11. Assertion Taenia solium has a characteristic uterus. Reason The ute...

    Text Solution

    |

  12. Assertion In Fasciola hepatica, digestion is intracellular. Reason ...

    Text Solution

    |

  13. Assertion Paragonimus is known as lung fluke. Reason Lung fluke spe...

    Text Solution

    |

  14. Assertion Scolex with hooks are present in Taenia Reason Structure ...

    Text Solution

    |

  15. Assertion Nematodes are different from flatworms Nematodes are commo...

    Text Solution

    |

  16. Assertion Telogonic is a condition of ovary Reason The telogonic go...

    Text Solution

    |

  17. Assertion Copulatory bursa is present in male Ancylostoma Reason Co...

    Text Solution

    |

  18. Assertion A parasitic disease elephantiasis can be identified with en...

    Text Solution

    |

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

    Text Solution

    |

  20. Assertion Power of locomotion is poor in Ascaris. Reason The body wall...

    Text Solution

    |