Question
List the features of Phylum Mollusca.
Solution
Main Features of the phylum mollusca are as follows:
(i) They have unsegmented or soft body.with little segmentation.
(ii) The body is divided into three regions—head, dorsal visceral mass and ventral foot.
(iii) Body is bilateral symmetrical.
(iv) The coelomic cavity is reduced.
(v) They have open circulatory system and kidney like organs for excretion.
(vi) Some molluscs have hard calcareous shell, an outer covering of the body.
(vii) Respiration is by gills called ctenidia.
Examples. Pila (snail), Unio (fresh water mussel) and Octopus.
