Phylum Mollusca General characteristics || B. Sc. Ist year || zoology

This video explains the General characteristics of Phylum Mollusca
This video will be helpful for B. Sc. Ist year, and M. Sc. zoology.
-Soft body animals
-Have exoskeleton of calcareous shell which may be internal or absent
-Body generally divided into 3 parts: head, foot and visceral mass.
-Presence of a glandular fold called mantle or pallium.
-most of molluscs have a rasping organ called radula in buccal Mass.
-presence of a mental or pallial cavity having digestive, excretory and reproductive organs collectively called pallial complex.
-Excretory organs are generally kidneys which act as coelomoducts.
-Presence of peculiar sense organ called Osphradium.
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