Phylum Porifera is classified based on which of the following characteristics?
Correct answer: C. Spicules
- A. Branching
- B. Symmetry
- C. Spicules
- D. Reproduction
Explanation
OPTION A: Phylum Porifera is not classified based on branching. Sponge species within this phylum can exhibit different growth forms, including branching and non-branching types. OPTON B: Phylum Porifera does not have a definitive symmetry. Sponges lack true tissue layers and complex body plans, so they do not exhibit radial or bilateral symmetry. OPTION C: Porifera is the phylum composed of the sponges. They lack true tissues, have no body symmetry, and are sessile. The classification of phylum Porifera is based upon the presence and composition of spicules.OPTION D: While reproduction is an important aspect of any classification, it is not the primary characteristic for classifying organisms into Phylum Porifera. Instead, it is based on the presence of specialized structures called spicules.
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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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