Question

For each phylum, list the characteristics;

1.) Cnidaria

Environment:

Level of organization (e.g. porifera = cellular):

Body symmetry:

Germ layers:

support system:

Nervous system:

Digestive system:

Circulatory system:

Respiratory system:

Excretory System:

Other Distinguishing Features:

2.) Ctenophora

For each phylum, list the characteristics:

Environment:

Level of organization (e.g. porifera = cellular):

Body symmetry:

Germ layers:

support system:

Nervous system:

Digestive system:

Circulatory system:

Respiratory system:

Excretory System:

Other Distinguishing Features:

Answer 1

1.) Cnidaria

Environment - aquatic, mostly marine.

Level of organization - tissue level of organization.

Body symmetry - radially symmetrical

Germ layer - diploblastic.

Support system - skeleton composed of calcium carbonate.

Nervous system - diffused type formed of nerve-nets.

Digestive system- extracellular as well as intracellular.

Circulatory system - absent

Respiratory system - absent

Excretory system- absent

Other features-1. Cnidarian are multicellular organisms.

2. Stinging cells are present.

3. Coelom is absent.

4. Mouth is present but anal opening is absent.

2.) Ctenophora

Environment- marine.

Level of organization- tissue level

Body symmetry- radially

Germ layer- diploblastic

Support system- skeletal system absent but a special adhesive cells called colloblast are present.

Nervous system- in the form of nerve net.

Digestive system- both extracellular and intracellular.

Circulatory system- absent

Respiratory system - by diffusion

Excretory system- by diffusion

Other features- 1. cilia used for locomotion.

2. Two anal opening are present.

3. They are hermaphrodites.

4. They are acoelomate animal.