A) Dermal ostia \[\to \] Gastral ostia \[\to \]Osculum
B) Dermal ostia\[\to \]Gastral ostia\[\to \]Spongocoel\[\to \]Osculum
C) Osculum \[\to \] Spongocoel \[\to \] Choanocytes \[\to \] Ostia
D) Pinacocytes \[\to \] Choanocytes \[\to \] Enteron \[\to \] Osculum
Correct Answer: B
Solution :
The course taken by water into the canal system is. water from outside \[\underset{\text{dermal ostia}}{\mathop{\xrightarrow{\text{through}}}}\,\] incurrent canals \[\underset{\text{prosopyles}}{\mathop{\xrightarrow{\text{through}}}}\,\] radial canals \[\underset{\text{apopyles}}{\mathop{\xrightarrow{\text{through}}}}\,\] spongocoel \[\underset{\text{osculum}}{\mathop{\xrightarrow{\text{through}}}}\,\] outside.
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