Question

Ques.1 write general characters of phylum echinodermata.

Answer 1

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Your answer is given below :

✴️body of echinodermata is covered by large number of spines

✴️echinodermata have organ system level of body organisation.

✴️echinoderms are triploblastic animals because these have 3 germinal layers at embryonic stage.

✴️echinoderms are true coelomates.

✴️These have water vascular system or ambulacral system un which water enters through a porous plate called medreporite.

✴️Body plan is tube within tube.

✴️These are non - chordates because notochord is absent.

✴️These are invertebrates because vertebral coloumn is absent.

✴️These have good power of regeneration.

✴️These are marine and benthonic type marines.

✴️Respiration occurs by dermal branchiae (gills)
And tube feet.

✴️Excretory syatem is absent. excretion occurs through body surface and these are ammonotelic.

✴️circulatory system is of open type and is called haemal system.


✴️development of echinoderms is indirect development.

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Answer 2

echinoderms are non chordates these are invertebrates. echinoderms have high power of regeneration.