Question

As the canal system becomes complicated the

• A. Number of flagella decrease
• B. Number of flagella increase
• C. Force to draw the current is increased
• D. Both B and C

Answer 1

The correct option is D Both B and C

In the simple type of canal system, there is a lesser number of cells but as the canal system becomes complicated, the number of flagellated cells increase and the force to draw the water current is also increased. The syncoid canal system is, therefore, more efficient than the asconoid type and the leuconoid type still more. The increase in the total area of the choanocyte surface increases the efficiency of the canal system.

So, the correct answer is option D.