In which of the following animals, mesoderm is present as scattered pouches in between the ectoderm and endoderm?

Liver fluke

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Ascaris

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Earthworm

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Unio

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Solution

The correct option is B
Ascaris
Mesoderm is found as scattered pouches in between ectoderm and endoderm in the organisms of phylum Aschelminthes only. Members of this phylum are thus known as pseudocoelomates. Ascaris belongs to phylum Aschelminthes, Liver fluke belongs to Platyhelminthes, Unio belongs to phylum Mollusca and Earthworm belongs to phylum Annelida.

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