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In which subphylum notochord is present ...

In which subphylum notochord is present only in larval tail?

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Urochordata
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Notochord is present in

In the sub-phylum (_i_) notochord is present only in the larval tail, while in (_ii_), it extends from head to tail region and is persistent throughout their life. In (_iii_) class of vertebrate notochord is replaced by certilaginous vertebral column and (_iv_) class of vertebrate the notochord is replaced by bony vertebral column. select the option which is correct for all (i)-(iv) blanks.

Which of the following statements is/are not true A. In Urochordata, notochord is present only in larval tail. B. In Cephalochordata, notochord extends from head to tail region. C. Branchiosoma belongs to Hemichordata D. Only one Class of living members, Class Cyclostomata represents the Super Class Agnatha.

Consider the following statements :- (1) Protochordates are exclusively marine (2) In cephalochordates, Notochord extends from head to tail region (3) In urochordates, Notochord is present only in larval tail (4) Cranium and vertebral column are bony in cyclostomates Which of the above statement is/are correct?

In which subphylum notochord is replaced by vertebral column?