The simplest type of canal system in Porifera is

Ascon type

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Leucon type

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Sycon type

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Radial type

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Solution

The correct option is A Ascon type
Ascon is the simplest type of canal system, in which dermal ostia open into central cavity or spongocoel, which opens to outside through osculum. Sycon and leucon type of canal systems are advanced canal systems produced by folding in the body wall of ascon type of sponges.
Hence the correct option is A.

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