Classification of Porifera is based on
Correct answer: B. Spicules
- A. Branching
- B. Spicules
- C. Reproduction
- D. Symmetry
Explanation
The Phylum Porifera is divided into three classes on the basis of spicules (skeleton) : calcarea or calcispongiae, hexactinellida or hyalospongiae and demospongiae or sclerospongiae. Class Calcarea have calcareous spicules, Class Hexactinellida have siliceous spicules and Class Demospongiae have siliceous spicules or spongin fibres.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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