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

Which one of the following phylums consists of animals that are bilaterally symmetrical and triploblastic?

A
Aschelminthes (Roundworms)
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Ctenophores
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Sponges
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Coelenterates (Cnidarians)
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A Aschelminthes (Roundworms)
Aschelminthes are triploblastic animals having bilateral symmetry. If the body of an organism can be divided into two equal halves on cutting it in one specific plane passing through the centre, then the symmetry is called bilateral symmetry.

Triploblastic animals have all the three germinal layers - ectoderm, endoderm and mesoderm.

Ctenophores and Coelenterates (Cnidarians) are radially symmetrical and diploblastic. They can be cut in any plane passing through the centre to get equal halves and have only two germinal layers - outer ectoderm and inner endoderm.

Sponges are asymmetrical i.e., which cannot be cut in any plane to get equal halves and diploblastic.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon