Question

Neopilina respires through

• A. Pulmonary cavity
• B. A pair of gills
• C. 5-6 pairs of gills
• D. Lungs

Answer 1

Answer: (C)

5-6 pairs of gills

C. 5-6 pairs of gills

Reason: Neopilina is a very primitive member amongst the molluscs and represents a sort of connecting link between the annelids and molluscs.

The respiratory organs of Neopilina are the gills attached to the dorsal side of the pallial groove. More or less 5 to 6 pairs of gills are present in every individual. The posterior gills have lamellae usually on one side, while the anterior ones have lamellae on both sides. The gills are supplied with blood by the afferent gill sinus to be returned by efferent gill sinus.