Question

Many sponges are larger than fishes yet they do not have respiratory organs. This explains that

• A. Sponges respire anaerobically.
• B. Sponges lead stationary life thus oxygen requirement is less.
• C. Sponges have a porous body through which water flows bathing every cell.
• D. Respiratory organs are useless in water.

Answer 1

The correct option is C Sponges have a porous body through which water flows bathing every cell.

Sponge belongs to phylum Porifera. It has cellular level of organization and thus, there are no definite organs or organ systems. They have a porous body through which water flows. They breathe through oxygen diffusion, which allows oxygen to pass from the water into the body of the sponge. Hence, the correct answer is option C.