ZoologyIn which one of the following, the genus name and its two characters are correctly matched? OrganismCharacter 1Character 21AscidiaVertebral columnPharyngeal gill slits2TorpedoElectric organsPlacoid scales3CatlaAir bladderTympanum4CrocodylusScutes over bodyThree-chambered heart

In which one of the following, the genus name and its two characters are correctly matched?

 OrganismCharacter 1Character 2
1AscidiaVertebral columnPharyngeal gill slits
2TorpedoElectric organsPlacoid scales
3CatlaAir bladderTympanum
4CrocodylusScutes over bodyThree-chambered heart

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

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    Solution:

    Torpedo is commonly called electric ray. It has electric organs. Scales in Chondrichthyes are placoid. 

    Ascidia is a urochordate. Notochord is present but vertebral column is absent in urochordates and cephalochordates. 

    Tympanum is absent in fishes (e.g., Catla). 

    Crocodiles have a four-chambered heart.

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