1.

In most simple type of canal system of porifera, water flows through which one of the following waysA. Ostia rarr Spongocoel rarr Osculum rarr ExteriorB. Spongocoel rarr Ostia rarr Osculum rarr ExteriorC. Osculum rarr Spongocoel rarr Ostia rarr ExteriorD. Osculum rarr Ostia rarr Spongocoel rarr Exterior

Answer» Correct Answer - A
(a) The course taken by water into the canal system is water form outside `underset("dermal ostia")overset("through")(rarr)` incurrent canals `underset("prosopyles")overset("through")(rarr)` radial canals `underset("apopyles") overset("through")(rarr)` spongocoel `underset("osculum")overset("through")(rarr)` outside.


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