question_answer

The correct sequence of water flow into body of sycon and out of it is

A)  Ostia \[\to \] Apopyles \[\to \] Prosopyles \[\to \] Osculum

B)  Ostia \[\to \] Prosopyles \[\to \] Apopyles \[\to \] Osculum

C)  Ostia \[\to \] Osculum \[\to \] Prosopyles \[\to \] Spicules       

D)  Osculum \[\to \] Apopyles \[\to \] Prosopyles \[\to \] Ostia

Correct Answer: B

Solution :

Sponges have numerous mouthlets (ostia) and one exit (osculum). The correct sequence of water flow into body of sycon is