Question

Sponges are characterized by
(a) amoeboid cells (b) choanocytes cells
(c) pigmented cells (d) gland cells

Answer 1

Sponges are characterized by:

(b) Choanocytes cells

• Choanocytes cells are also known as "collar cells". They are along the interior line of syconoid, asconoid and leuconoid body type sponges.

• Due to their unique structure, it becomes possible to carry out several functions within sponges.

• Choanocytes cells perform the primary function of assisting circulation.

Answer 2

Sponges are characterized by  choanocytes cells.

Option (B) is correct.

Explanation:

Choanocytes are cells, which line the interior body of the sponges.

Choanocytes are of three types.

• They are found dotting the surface of the spongocoel in asconoid sponges.
• The form radial canals in syconoid sponges.
• They comprise entirely the chambers in leuconoid sponges.

Choanocytes generate a flow of water through the sponge's pores, into the spongocoel and out through the osculum.

This improves both respiratory and digestive functions for the sponge.

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