Question

write a short note on echinoderms

Answer 1

Echinodermata is originated from 2 greek words , echinos meaning hedgehog and derma means skin son it means organism having spines in their body.

These are free living marine animals.

They are triploblastic and have a coelomic cavity.

They have water driven tube system for movement.

They have hard calcium carbonate structure that they use as a skeleton.

Examples are starfish and sea urchins.

Answer 2

Answer:

Echinodermata :

# these are exclusive Marine animal.

# they are triploblastic.

# they have true ceolom.

# body is uniquely shaped , it can be elongated and spherical.

# body is unsegmented without head.

# respiration occurs through gills.

# tube feet help in locomotion.

# sexes are separate.

# host part can be regenerated.

# body surface is covered with calcareous spicules.

# Example - starfish , sea lily , brittle star etc.