Question

1. What special structures are specific to the phylums of Porifera, Cnidaria, Ctenophora, and Platyhelminthes?

Answer 1

The special structures of the following phylums:

• Porifera: members of this phylum have special collar cells. They have cellular level of body organisation.
• Cnidaria: members have stinging cells on the tentacles surrounding mouth.
• Ctenophora: members have comb like ciliary plates for swimming.
• Platyhelminthes:  For the first in animal kingdom, members of this phylum there is development of sensory and nervous tissue in the head region (cephalization)