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Question

How do animals of Porifera differ from animals of Cnidaria ?

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Solution

Porifera differs from Cnidaria in following characters:
Porifera:
(i) Cellular level of organisation.
(ii) Digestion is intracellular.
(iii) Appendages are absent in poriferans.
(iv) They contain special cells called collar cells or c hoancytes.
Cnidaria:
(i) Tissue level of organisation.
(ii) Digestion is both extracellular and intracellular.
(iii) They have appendages in the form of tentacles.
(iv) They contain special cells called cnidoblasts which contain nematocysts.


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