Molluscs with a Tubular Shell,open at Both Ends Are the Class

Q5: Opisthobranchs that have no shell or true

Q6: The class Gastropoda is the most diverse

Q7: The nudibranchs belong to the<br>A)ProsobranchiA.<br>B)Opisthobranchia.<br>C)Pulmonata.<br>D)Scaphopoda.

Q8: The pulmonate snails lack gills,and their mantle

Q9: The mantle cavity in a mollusc houses

Q11: The _ is the outer layer of

Q12: One group of molluscs in particular,the _,serve

Q13: Many freshwater clams have specialized,parasitic _ larvae.

Q14: Torsion in gastropods caused the mantle cavity

Q15: The muscles which hold the valves of