Question

write any 4 distinguishing characteristics of =(Phylum Echinodermata)



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Answer 1

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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.

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Answer 2

Phylum Echinodermata ( Phylum Echinoderm )

• Echinoderms are exclusively marine spiny - skinned animals .

• They reproduce sexually and is having indirect development ( larva stage is present ).

• The larva of echinoderms are bilaterally symmetrical while adults are radially symmetrical.

• The outer endoskeleton of echinoderms are calcareous and is embedded with spicules for protection .

• Their mouth is downdardly directed while anus is directed upwards.

• They have a complete digestive system..

• Excretory system is absent and excretion occurs through diffusion .

• The main excretory product of echinoderms are ammonia.

• Echinoderms lacks brain and the neural system of nerve rings encirclying the oesophagus.

• A well developed water vascular system of ambulacral system is present which is a modification of coelom .

• The vascular system helps these organisms for locomotion, food and waste transportation, and respiration.

• Examples includes starfish , seacucumber , sea urchins etc .