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Standard XII
Biology
Subphylum Cephalochordata
What is the f...
Question
What is the fate of notochord in an adult organism which belongs to Gnathostomata?
A
Notochord extincts
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B
Notochord is replaced by the vertebral column
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C
Notochord becomes vestigial
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D
Notochord continues same as in larval stage
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Solution
The correct option is
C
Notochord is replaced by the vertebral column
Phylum Chordata can be divided into two categories:-
1) Protochordata- The notochord is present in the larval stage of these animals and it is rudimentary in adults.
2) Vertebrata- The notochord is replaced by a vertebral column in adults.
Gnathostomata is a superclass which includes jawed vertebrate fishes.
They come under the subphylum vertebrata i.e the notochord is replaced by a vertebral column in adults.
So, the correct answer is 'Notochord is replaced by the vertebral column'.
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