A) Platyhelminthes and Arthropoda
B) Echinodermata and Annelida
C) Annelida and Arthropoda
D) Mollusca and Chordata
Correct Answer: B
Solution :
[b] Metameric segmentation is the characteristic of Annelida (e.g., earthworm) and Arthropoda (e.g., Cockroach). |
In earthworm, body consists of 100-120 ring like segments or somites called metameres. It shows true segmentation i.e., external segmentation corresponds with internal segmentation. |
Cockroach also shows the metameric segmentation. Its anterior few segments are specialized to form head. Such metamerism is called heteronomous metamerism. |
Metameric segmentation is absent in platyhelminthes, Echinodermata, Mollusca etc. |
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