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प्रश्न
How do animals of Porifera differ from animals of Cnidaria?
उत्तर
| Porifera | Coelenterata (Cnidaria) |
| 1. They have a cellular level of organisation. | 1. They have a tissue level of organisation. |
| 2. Their bodies have a number of inhalent (incurrent) pores or ostia and a single exhalant (excurrent) pore or osculum. | 2. Their bodies have only a single opening. |
| 3. Digestion is intracellular. | 3. Digestion is both extracellular and intracellular. |
| 4. Muscle and nerve cells are absent. | 4. Muscle and nerve cells appear for the first time in coelentrates. |
| 5. Appendages are absent in poriferans. | 5. Coelenterates have appendages in the form of tentacles. |
| 6. Poriferans contain the special cells called collar cells or choanocytes. | 6. Coelenterates contain the special cells called cnidoblasts which contain nematocysts. |
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