Question

explain enchinodermata

Answer 1

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Echinodermata :

• The animal of this phylum have spiny skin .

• It have hard covering of endoskeleton which are made up of calcium  

• These animal body have Radical symmetry , triploblastic and Coelomate .

• Vascualr system is present so it help in capturing of food , locomotion and respiration .

• Example – Starfish and sea cucumber etc  

Symmetry :

1] Bilateral symmetry : Bilateral symmetry means body divide into two equal parts  

2] Radical Symmetry : Radical symmetry means body divide into multiple equal parts  

Germ  layers :  

1] Diploblastic : Diploblastic means body formed from two germs layer .

2] Triploblastic : Triploblastic means body formed from three germs layer .

Colemate : Colemate means Body cavity present in the body .

Acolemate : Acolemate means body cavity absent in the body .  

Segmentation : A body which have segment called Segmentation  

Skelation :  

1] Exoskelation : Exoskelation means hard covering of calcium carbonate present which help to protection of body  

2] Endoskelation : Endoskelation means hard covering of Calcium present which help to also protection of body  

• Chorodata : Chorodata means vertebral column present and Notochord also present  
• Non- Chorodata : Non – Chorodata means Absent vertebral column and Notochord also absent  

Answer 2

Answer:-

ECHINODERMATA:-

1. These are exclusively marine animals.
2. They are triploblastic which means that their body is derived from three embryonic layers
3. They Have True Coelom ( body cavity )
4. They have tube feet which helps them in locomotion.
5. Respiration occurs through gills and tube feet.
6. Their lost parts can be regenerated.
7. They carry out external fertilisation.
8. They have spinny skin.
9. Their body has radical symmetry

Phylum Echinodermata is further classified into the following classes:-

• Asteroidea
• Ophiuroidea
• Echinoidea
• Holothuroidea
• Crinoidea

Examples:-

Star Fish , Sea lily , brittle star etc

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