Question

Features of echinodermata

Answer 1

1. Echinos means Spines; derma means Skin)
2. Kingdom: Animalia
3. Habitat: These are exclusively marine
4. Grade of organization: organ system grade
5. Germ layer: triploblastic
6. Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.
7. Coelom: present ( coelomate)
8. Body without segmentation
9. The shape of the body is flat, star like, spherical or elongated.
10. Head is absent
11. Presence of tube feet
12. Presence of water vascular system
13. Mouth is present on ventral side while anus is present on dorsal side
14. Respiration: by papule, gills or clocal respiratory tree
15. Nervous system: absent, they are brainless organism.
16. Circulatory system: is reduced, heart is absent
17. Blood has no pigment.
18. Digestive system: complete
19. Excretory system: absent
20. Sexes: mostly dioecious, rarely monocious
21. Reproduction:

• Sexual: by gamatic fusion
• Asexual: regeneration

1. Fertilization: external
2. Development: indirect with characteristic larvae.