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

Which of the following options does correctly represent the characteristic features of phylum Annelida?

A
Triploblastic, unsegmented body and bilaterally symmetrical
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Triploblastic, segmented body and bilaterally symmetrical
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Triploblastic, flattened body and acoelomate condition
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Diploblastic, mostly marine and radially symmetrical
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B Triploblastic, segmented body and bilaterally symmetrical
Characteristic features of phylum Annelida:
  • They are triploblastic as they have three germ layers (ectoderm, mesoderm and endoderm) during their embryonic development.
  • They exhibit bilateral symmetry as the body of these organisms can be cut into two equal halves in only one plane i.e., the median sagittal plane.
  • Body of annelids is segmented both externally and internally. The characteristic feature of this phylum is metamerism. Linear repetition of certain body parts is called metamerism.
  • Annelids are coelomates as they have a body cavity between alimentary canal and body wall and it is lined by mesoderm on all sides.
Hence, option b is correct.

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