CBSE Class 9 Answered
how do poriferan animals differ from coelenterate animals
Asked by | 21 Jan, 2009, 10:06: PM
Expert Answer
Poriferans show cellular grade of organisation whereas coelenterates show tissue grade of organisation.
Poriferans show numerous pores called ostia which are absent in coelenterates.
Mouth is absent in poriferans but present in coelenterates.
Coelenteron is present in coelenterates but absent in poriferans.
Skeleton shows spicules in porifera which are not seen in coelenterates. In several coelenterates a hard exoskeleton is present
Coelenterates possess cnidoblasts bearing stinging cell organelles called neamatocysts. These are absent in poriferans.
Polymorphism is seen in coelenterates but not in poriferans.
Answered by | 22 Jan, 2009, 04:48: PM
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