Multiple choice

Which of these are classes of phylum Porifera?

  1. Calcarea, Hexactinellida and Demospongiae

  2. Cnidaria and calcarea only

  3. Turbellaria, Hexactinellida and Demospongiae

  4. Hirudinaria, Calcarea and Cnidaria

  5. Calcarea, Cnidaria and Turbellaria
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A Correct answer
Explanation

Correct answer. All of these are classes of phylum Porifera. Calcarea, Hexactinellida and Demospongiae are classes of phylum Porifera. Cnidaria is a separate phylum, Turbellaria is a class of phylum Platyhelminthes while Hirudinaria is Indian common leech.

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