Metameric segmentation is best exemplified by
A{'text': 'Ascaris', 'label': 'A'}
B{'text': 'Taenia', 'label': 'B'}
C{'text': 'Pheretima', 'label': 'C'}
D{'text': 'Aurelia', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Pheretima', 'label': 'C'}
1. Metameric segmentation is defined as external + internal division of the body into segments with serial repetition of organs.
2. It is characteristic of phylum Annelida, of which Pheretima (earthworm) is a member.
3. Ascaris is Aschelminthes (roundworm), Taenia is Platyhelminthes (tapeworm), Aurelia is Coelenterate.
4. Taenia may appear segmented externally, but its "segments" are proglottids, not truly metameric.
_Source: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.1.5 and §4.2.6_
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