Answer :

Characters of phylum Mollusca: This is the second largest animal phylum

● Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation.


● They are bilaterally symmetrical, triploblastic and coelomate animals


● They have an open circulatory system and kidney-like organs for excretion.


● Body is covered by a calcareous shell.


● Body divisible into head, muscular foot and visceral hump.


● The mouth contains a file-like rasping organ for feeding, called radula.


● Respiration by gills.


● They are usually dioecious and oviparous with indirect development.


(i) Gastropoda - Pila (Apple snail);


(ii) Pelecpoda- Unio (Mussel);


(iii) Cephalopoda – Sepia (Cuttle fish).


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