Question

Fresh water mussel has

• A. A radula for feeding
• B. Inhalent siphon
• C. Exhalent siphon
• D. Both B and C

Answer 1

Answer: (D)

Both B and C

Both marine and freshwater mussels are filter feeders that feed on plankton. They do so by drawing water in through their incurrent siphon. The water is then brought into the branchial chamber by the actions of the cilia located on the gills for cilliary-mucus feeding. There is an inhalent or incurrent siphon, and an exhalent or excurrent siphon. The water is circulated by the action of the gills. Usually water enters the mantle cavity through the inhalent siphon, moves over the gills, and leaves through the exhalant siphon.

So, the correct option is (D)