Question

The requisition of a good canal is

• A. High oscular velocity
• B. A slow current for helping choanocytes to pick up food particles
• C. Both A and B
• D. None of the above

Answer 1

Answer: (C)

Both A and B

Life of the sponges is dependent on the water canal system. All the activities of their body depend on the current of water that enters through ostia and passes out through oscula. Water current flows through a system of spaces which collectively constitute the canal system. The choanocytes are organized to form water canal system and water currents bring food and oxygen for a sponge. It also carries away metabolic and digestive wastes. and is also used for circulation and filtration of food.

So, the correct answer is option C.