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प्रश्न
“All vertebrates are chordates but all chordates are not vertebrates.” Justify the statement.
उत्तर
- Animals classified as chordates have notochords, a stiff structure resembling a rod that is present on the dorsal side, at some point in their existence.
- Three Subphyla make up the Phylum Chordata: Urochordata, also known as tunicata, Cephalochordata, and Vertebrata. Protochordates are the only marine subphyla Urochordata and Cephalochordata, which are commonly referred to as such.
- In cephalochordata, the notochord extends from the head to the tail region and remains throughout the life, whereas in urochordata, it is only present in the tail of the larva and vanishes in adulthood.
- The notochord, which is present in Subphylum Vertebrata members during the embryonic stage, is replaced by a cartilaginous or bony vertebral column in adulthood. Therefore, all chordates are not vertebrates, but all vertebrates are chordates.
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