A) Mollusca-Pseudocoet
B) Cnidaria-Nematocyst
C) Annelida-Chloragogen cells
D) Echinodermata-Water vascular system
Correct Answer: A
Solution :
Molluscs are coelomate animals. In such animals, body cavity is lined by mesoderm. Whereas, in some animals body cavity is not lined by mesoderm, instead, the mesoderm is persent as scattered pouches in between the ectoderm and endoderm. Such animals are called pseudocoelomates, e.g. Aschelminthes.
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