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Q.

Which one of the following is not characteristic of phylum Annelida?

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a

Segmentation

b

Mesodermal pouches between ectoderm and endoderm

c

Ventral nerve cord

d

Closed circulatory system

answer is B.

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Detailed Solution

When the body cavity is not lined by mesoderm and instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called pseudocoelom. It is observed in members of Aschelminthes.

Annelida possess segmentation, closed circulatory system and ventral nerve cord.

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