Question

Cloacal respiration occurs in

• A. Sea dollar
• B. Sea urchin
• C. Sea cucumber
• D. Sea lily

Answer 1

Answer: (C)

Sea cucumber

A) Sea Dollars respire through tube feet.

B) Sea Urchins respire through external gills.

C) Sea Cucumbers inhale oxygen through their cloaca. The oxygen that is inhaled is dissolved in water. The Sea Cucumber opens its anus and cloaca to allow water in and then closes both. Here the water is pushed into the respiratory trees. Gases are exchanged through diffusion from the sea water in the respiratory trees to the coelom fluids. After this process, the sea water is allowed out through the cloaca.

D)Sea Lilies respire through tube feet.

So the correct option is 'Sea Cucumber'