Question

Which of the following is not a major function of the canal system in sponges?

• A. Serves the purpose of nutrition
• B. Helps in gaseous exchange
• C. Takes part in the development of gemmules
• D. Increases the surface area of the animals exposed to water

Answer 1

Answer: (C)

Takes part in the development of gemmules

The sponges are diploblastic. The flagella of choanocytes beat to produce a water current, which enters the spongocoel through ostia. It carries food particles and oxygen and sweeps away the metabolic wastes through osculum. Therefore, the canal system serves the function of food collection, respiration and excretion. These are the primary function of the canal system.

So, the correct answer is option C.