A) feeding
B) digestion
C) reproduction
D) excretion
Correct Answer: A
Solution :
In bivalve molluscs (Unio) the gills are formed by fusion of successive branchial or gill filaments. These are succfaced with cilia. The beating of lateral cilia of gill filaments draw water into the infra branchial chamber of mantle cavity through the incurrent siphon. The water contain food material of Unio. The digestive system in Unio comprises of alimentary canal and paired digestive glands. The digetion takes place in alimentary canal. The excretion takes place by a pair of kidney or organs of Bojanus and the Kebers organs. Unio is dioecious i.e., sexes are separate. The gonads, testes in male and ovaries in female are a pair of large simple branching tube lying among intestinal coils in the visceral mass just above the foot.
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