A) Ostia\[\to \] Spongocoel\[\to \] Osculum\[\to \] Exterior
B) Spongocoel \[\to \] Ostia \[\to \] Osculum \[\to \] Exterior
C) Osculum\[\to \] Spongocoel\[\to \] Ostia \[\to \] Exterior
D) Osculum \[\to \] Ostia \[\to \] Spongocoel \[\to \] Exterior
Correct Answer: A
Solution :
The ascon type is the simplest type of canal system found in asconoid sponges like Leucosolenia. The course of water current in ascon type of canal system looks like \[\text{Ingressing}\,\text{water}\xrightarrow[\text{Ostia}]{\text{Trough}}\text{spongocoel}\]\[\xrightarrow[\text{Osculum}]{\text{Through}}\text{To}\,\text{outside}\]
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