Question

Water current in a sponge$/$Leucosolenia is maintained by

• A. Pinacocytes
• B. Porocytes
• C. Choanocytes
• D. Amoebocytes

Answer 1

Answer: (C)

Choanocytes

A. Pinacocytes are the flattened cells that form the outer layer or dermal epidermis of body wall of sponges. This outer layer is also called as pinacoderm.

B. Between the pinacocytes in the pinacoderm, a number of large conical, on open tube like peculiar cells called porocytes are present. The tunnel in each porocytes is called an ostium by which sea water enters into the spongocoel.

C. Choanocytes, also called as collar cells, are the specialised flagellated cells that form the gastral epidermis of the inner layer of body wall in sponges. These cells are the characteristic feature of sponges. These cells play an important role in maintaining water current.

D. Amoebocytes are the moving or motile cells that can get transformed into any other type of cell.

So, the correct answer is 'Choanocytes'.