Question

The structure present in sponges, which corresponding to mouth of other animals is

• A. Incurrent canal
• B. Ostium
• C. Osculum
• D. Choanocytes

Answer 1

The correct option is B Ostium

A. Incurrent canals are the openings in the body of sponges through which water enters from outside.

B. Ostia (singular: ostium) are the inhalant pores in sponges through which water enters the body.

C. Osculum is the pore in sponges through which water flows out of the body.

D. Choanocytes are flagellated cells that line the interior of spongocoel as shown in figure.

Hence, in sponges, ostium corresponds to the mouth of other animals, as it is the entry point for water in sponges.

So, the correct answer is 'Ostium'.