Question

describe charactersticts of porifera, cnidaria, annelida, arthropoda, platyhelmenthis, aschelminthes, mollusca, echinodermata,

Answer 1

$\textbf{PORIFERA}$

→ They have cellular level of organization.

→ Sponges with cylindrical shape are Symmetrical and others are Asymmetrical. They are Diploblastic animals.

→ Digestive system is absent in them.

→ They respire through their body surface by diffusion.

→ Segmentations are absent in them.

→ Ex :- Sponges, Spongilla etc.
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$\textbf{CNIDARIA}$

→ They have tissue level of organization system.

→ They are Radially symmetry and Diploblastic animals.

→ Digestive system is incomplete in them.

→ They respire through body surface by diffusion.

→ Segmentations are absent in them.

→ Ex :- Sea-pan, Sea-fan etc.
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$\textbf{ANNELIDA}$

→ They have organ level of organization system.

→ They are Bilaterally symmetry and Triploblastic animals.

→ Digestive system is complete in them.

→ They respire through their skin.

→ It divide into segments by rings.

→ Ex :- Earthworm, Leeches etc.
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$\textbf{ARTHROPODA}$

→ They have organ level of organization system.

→ They are Bilaterally symmetry and Triploblastic animals.

→ Digestive system is complete in them.

→ They respire through body surface, trachea and gills.

→ Segmentations are present in them.

→ Ex :- Spiders, Prawns, Insects etc.
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$\textbf{PLATYHELMINTHES}$

→ They have organ system level of organization system.

→ They are Bilaterally symmetry and Triploblastic animals.

→ They have incomplete digestive system.

→ They respire through their body surface by diffusion.

→ Segmentations are absent in them.

→ Ex :- Tape worm, Liver fluke etc.
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$\textbf{ASCHELMINTHES}$

→ They have organ system level of organization system.

→ They are Bilaterally symmetry and Triploblastic animals.

→ They have complete digestive system.

→ They respire through body surface by diffusion.

→ Segmentations are absent in them.

→ Ex :- Ascaris, Hookworm etc.
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$\textbf{MOLLUSCA}$

→ They have organ system level of organization system.

→ They are Bilaterally symmetry and Triploblastic animals.

→ Complete digestive system is present in them.

→ Respiration takes place by gills.

→ They are usually unsegmented. Neoplinia is the segmented mollusca.

→ Ex :- Snails, Oyster, Cuttle fish etc.
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$\textbf{ECHINODERMATA}$

→ They have organ system level of organization system.

→ They are Radially symmetry and Triploblastic animals.

→ Digestive system is complete.

→ They respire through gills.

→ Segmentations are absent.

→ Ex :- Star fish, Star dollar, Sea cucumber etc.
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$\textbf{Note}$

* Radial Symmetry :- In which the body can be divided into two equal halves by any plan passing through centre from top to bottom.

* Biradial Symmetry :- The combination of radial and bilateral symmetry.

* Bilateral Symmetry :- The body can be divided into two equal halves by a single plane.

* Diploblastic animals :- In which two layers namely; endoderm and ectoderm are present.

* Triploblastic animals :- In which three layers namely endoderm, ectoderm and mesoderm are present.
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