Question

For each phylum, list the characteristics;

9.) Crustaceans

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:

For each phylum, list the characteristics;

10.) Echinoderms

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

9). Crustaceans.

They are found mainly in water, that is, aquous environment.

Level of organisation is of organ level.

Body id bilaterally symmetrical and triploblastic with segmentation.

Body is supported by exoskeletonmainl consisting of chitin which is carbohydrate.

Nervous system consists of ganglia which is situated ineach segment. It has compund eye and a pair od antennae. Statocyst or balance organs may be present.

Digestive system consists of alimentary canal. It consists of oesophagus, crop, gizzard, ileum colon and rectum.

Circulatory system is of open type, that is, all the organs are bathed in haemolymph. heart is 13 chambered which pumps body fluid.

Respiratosy system consists of gills. book gills or book lungs.

Excretion is carried out mainly with the help of malphigian tubules.

10). Echinoderms

They are mostly marine.

Level of organisation is of organ system.

Body of adult echinoderm is radially symmetrical but larvae may possess bilateral symmetry.

They are triploblastic, germ layers are ectoderm, mesoderm and endoderm.

They have endoskeleton of calcium spicules.

Nervous sytem consiss of ganglia. eyes are absent.

Digestive system is complete with presence of mouth and anus.

Circulatory system os absent as well as respiratory system and respiratory sytem is absent.

They have a special system present in them known as water vascular syatem which helps them in circulation. respiration. capturing of food particles and excretion.