Question

Two
characteristics that are unique to cnidarians

Answer 1

UNIQUE CHARACTERISTICS PHYLUM CNIDARIA

PHYLUM CNIDARIA

Unique Characteristics:

1. In Greek means 'stinging structure'.

2. Most marines, few fresh water species.

3. e.g : Obelia sp.

4. Eumetazoans

5. Diploblastic(2 well developed tissue layer)

a)Inner gastrodermis/endoderm

b)Outer epidermis/ectoderm

*Gelatinuous mesoglea between layers

6. Radial symmetry

7. Acoelomate

8. Have reproductive circulatory,and gastrovascular systems

9. Possess both muscle and nerve cells

10. No body cavity

11. Exhibit dimorphism/polymorphism ;

-In the form of polyp (sessile)