Q.The radula, a file-like feeding organ, is a characteristic feature of phylum

The second largest phylum, soft-bodied, unsegmented, bilaterally symmetrical, triploblastic and coelomate, with a body divided into head, muscular foot and dorsal visceral hump. A mantle envelops the visceral hump, enclosing a mantle cavity that houses respiratory ctenidia (gills); the mantle typically secretes an external calcareous shell (absent/internal in some groups). Most molluscs feed using a rasping radula, absent in filter-feeding biva …