Question

Notochord is absent in the group ________.
a) Hemichordata
b) Chordata
c) Cephalochordata
d) Urochordata

Answer 1

cephalochordata is your answer

Answer 2

Hii Manya,

◆ Answer -

Notochord is absent in the group urochordata.

◆ Explanation -

Actually, at birth notochord is present in all of the options. But, it degenerates in adult form of urochordata. So that is most appropriate answer.

◆ Extra information -

Phylum Chordata consists of following subphyla -

1) Hemichordata -

It includes acorn worms.

2) Urochordata -

It includes tunicates.

3) Cephalochordata -

It includes lancelets.

4) Vertebrata -

It includes mammals, birds, amphibians, fishes.

Hope this helped you. Thanks for asking..