Difference between Hydra and Sponge
No. |
Hydra |
Sponge |
1. | Hydra are small, exist in polyp form, solitary, radially symmetrical and attached with the substratum at one end and belongs to phylum Cnidaria. | Sponge is a simple aquatic animal, chiefly marine invertebrate animal, animal of phylum Porifera and have porous skeleton. |
2. | Hydra belongs to phylum coelenterata or Cnidaria. | Sponge belongs to phylum Porifera. |
3. | Hydra has tissue level of organization. | Sponge has cellular level of organization. |
4. | Hydra contains mouth. | Sponge do not contain mouth. |
5. | Hydra is basically a freshwater organism. | Sponges are mostly marine animals but few of them are included in the freshwater organisms. |
6. | Hydra obtains its nutrition from small insects, insect larvae, small crustaceans etc. | Sponges obtain their nutrition from floating organic particles and tiny planktons from the water. |
7. | Symmetry of hydra shows that it is radially symmetrical. | Symmetry of sponge shows that they are mostly asymmetrical. |
8. | It is a multicellular organism. | It is a primitive kind of multicellular organism. |