Question
Biology Question on Kingdom Animalia
Classification of Porifera is based on
A
branching
B
spicules
C
reproduction
D
symmetry.
Answer
spicules
Explanation
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.