Question

Enumerate the characteristic of a class that contains organisms with two types of symmetry in their life cycle.

Answer 1

Two types of symmetry, i.e. bilateral and radial both is found in phylum Ctenophora. The characters are:

1. Incomplete gut, only mouth present. 

2. No organ for excretion, respiration or circulation. 

3. Diploblastic. 

4. Biradially symmetrical 

5. Eight rows of ciliated comb-like structures.