wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

It is believed that true chordates have evolved from the phylum ___.


A

Echinodermata

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

Hemichordata

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

Urochordata

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

Cephalochordata

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B

Hemichordata


True chordates are those that exhibit the primary chordate characteristics: notochord, dorsal hollow nerve cord and paired pharyngeal gill slits. It is believed that these animals evolved from the hemichordates (such as the acorn worm), which exhibit certain chordate-like characteristics. There are branchial openings, or "gill slits," that open into the pharynx; there is a rudimentary structure in the collar region, the stomochord, that is similar to a notochord; and there is a dorsal nerve cord, in addition to a smaller ventral nerve cord. However, hemichordates are not classified as true chordates, although they are quite closely related. Urochordates are the first group of true chordates, followed by the cephalochordates and vertebrates.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Phylum Chordata
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon