Question

50 points ..For biology students ,

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Write a note on Phyllum Echinodermata .

Don't copy from google

Answer 1

➡➡➡hey buddy. ❤❤❤

⏺⏺ PHYLUM ECHINODERMATA

➡ ECHINO= SPINY. DERMA= SKINNED

➡ The organisms of this phylum are known mainly due to the prrsence of ENDOSKELETON made of calcareous ossicles..

➡ All organisms belonging to this phyla are marine with the organ system level of organisation.

➡ The one of the main characters is that,,

in adults i.e, adult echinoderms the body is radially symmetrical

, whereas in larval echinoderms body is bilaterally symmetrical..

➡ as above mentioned, about larva, hence the development is not direct, i.e, they pass through larval stage..(or) free swimming larva

➡ Another most important character of this phyla is the presence of WATER VASCULAR SYSTEM.. which helps in the LOCOMOTION, transportation of food and respiratory gases..

➡ No excretory system(particular)

➡ Fertilisation is usually external

➡examples==>>

1.Asterias
2. Echinus
3. Cucumaria

➖➖be brainlyyy###

Answer 2

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Characteristics of Echinodermata

• They have a star-like appearance and are spherical or elongated.

• They are exclusively marine animals.

• The organisms are spiny-skinned.

• They exhibit organ level of organization.

• They are triploblastic and have a coelomic cavity.

• The skeleton is made up of calcium carbonate.