Phylum Chordata


 
 
Concept Explanation
 

Phylum Chordata

All animals which have a notochord at some stage of life are called chordates. The notochord is a flexible, rodlike structure running through the length of the body of chordates, or animals of the phylum Chordata. It lies below the nerve chord and provides support to the body. In higher chordates, or vertebrates, the notochord is replaced by the vertebral column. In addition, all chordates show the following characteristics at some stage of life.

                   

                                                Chordata

  • A tubular, hollow, dorsal nerve cord which lies above the supporting notochord.
  • A set of gill slits in the throat called pharyngeal clefts.
  • A post-anal (behind the anus) tail.
  • A proper blood-circulation system.
  • This phylum is divided into three subphyla—Urochordata, Cephalochordata and Vertebrata. Urochordates and cephalochordates are called lower chordates, or protochordates. Vertebrates are the most developed animals.

                              

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    Sample Questions
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    Question : 1

    ______________ structure is present in all the chordates.

    Right Option : B
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    Question : 2

    All chordates possess _____________

    Right Option : D
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    Question : 3

    Chordates are  ______________  .

    Right Option : A
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