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  4. Classification of Porifera is based on

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Q. Classification of Porifera is based on

AIPMTAIPMT 1991Animal Kingdom

Solution:

The phylum Porifera is divided into three classes : calcarea or calcispongiae, hexactinellida or hyalospongiae and demospongiae or Sclerospongiae, on the basis of spicules (skeleton). Class calcarea have calcareous spicules, class hexactinellida have siliceous spicules and class demospongiae have siliceous spicules or spongin fibres or both.