Question

characteristics of echinodermata​

Answer 1

Answer:

• Kingdom: Animalia
• Habitat: They are marine
• Grade of organization: organ system grade
• Germ layer: triploblastic
• Coelom: present ( coelomate)
• Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.
• Body without segmentation
• Head is absent
• Presence of tube feet
• The shape of the body is flat, star like, spherical or elongated.
• Presence of water vascular system
• Mouth is present on ventral side while anus is present on dorsal side
• Respiration: by papule, gills or clocal respiratory tree
• Nervous system: absent, they are brainless organism.
• Blood has no pigment.
• Digestive system: complete
• Excretory system: absent
• Fertilization: external
• Reproduction:   Sexual-by gametic fusion  Asexual regeneration

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Answer 2

• This phylum comprise animals possessing calcareous ossicles. Thereby, the name echinodermata which means spiny bodied.

• Marine habitat

• Organ- system level of organisation

• Adult echinoderms - radially symmetric

Larvae - bilaterally symmetric

• Triploblastic

• Coelomate

• Complete digestive system

Mouth - ventral

Anus - dorsal

• Distinctive feature - water vascular system

• Significance of water vascular system - locomotion, capture, transport of food and respiration

• Excretory system - absent

• Dioecious

• Reproduction - sexual means

• Fertilisation - external

• Development - indirect(free-swimming larva)