Question

Characteristics feature of echinodermata​

Answer 1

Answer:

General characteristics of Phylum Echinodermata•

Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical. The shape of the body is flat, star like, spherical or elongated. Nervous system: absent, they are brainless organism. Blood has no pigment.

Answer 2

ANSWER-

Features of Echinodermata are-

1. They have endosceleton of calcareous ossicles.
2. Echinodermata means spiny bodied.
3. All the organisms of this phylum are marine.
4. The organisms have organ system level of organisation.
5. Head and body segmentation is absent.
6. The adults are radially symmetrical whereas the younger/ larvae are bilaterally symmetrical.
7. They are triplobastic (have three germ layers)
8. They are coelomate.
9. The digestive system is complete.
10. They have water vascular system.
11. A part of coelom develops into water vascular system.
12. This water vascular system helps them in locomotion and capturing of food.
13. Excretory system is absent.
14. They have unsegmented body.
15. Respiration occurs through respiratory tree and tube feet.
16. They have high power of regeneration.
17. Circulatory system is open.
18. Heart is absent.
19. Respiratory pigments are absent.

Example- Star fish, Brittle star, Sea urchin etc