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Question

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

A
Triploblastic, unsegmented body and bilaterally symmetrical
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B
Triploblastic, segmented body and bilaterally symmetrical
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C
Triploblastic, flattened body and acoelomate condition
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D
Diploblastic, mostly marine and radially symmetrical
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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.

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