A) porocyte
B) tncurrent
C) apopyle
D) spongocoel
Correct Answer: D
Solution :
Canal system of Leucosolenia is of ascon type. It is the simplest type of canal system found in sponges, in this ostia, spongocoel and osculum together form a canal system. Water enters directly through ostia into the central spongocoel which is lined by choanocytes and leaves through osculum.
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