Question

enlist the characteristics which are found in the phylum 'Echinodermata'.

Answer 1

(Echinos: Spines; derma: Skin)Kingdom: AnimaliaHabitat: These are exclusively marineGrade of organization: organ system gradeGerm layer: triploblasticSymmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.Coelom: present ( coelomate)Body without segmentationThe shape of the body is flat, star like, spherical or elongated.Head is absentPresence of tube feetPresence of water vascular systemMouth is present on ventral side while anus is present on dorsal sideRespiration: by papule, gills or clocal respiratory treeNervous system: absent, they are brainless organism.Circulatory system: is reduced, heart is absentBlood has no pigment.Digestive system: completeExcretory system: absentSexes: mostly dioecious, rarely monociousReproduction:Sexual: by gamatic fusionAsexual: regenerationFertilization: externalDevelopment: indirect with characteristic larvae

Answer 2

Hi.



here is your answer.




Phylum :- Echinodermta.


These phylum have an endoskeleton of calcareous ossicles and hence the name Echinodermta.

All are the marine with the organ - system level of organisations. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical.



They are triploblastic and coelomet animals. Digestive system is complete with mouth on the lower side and anus on the upper dorsal side.



The most important feature of Echinoderms are presence of water vascular system.



hope it helps you.