alleryOstia, spongocoel and osculum together describe the water canal system of
ACoelenterates
BCtenophores
CRoundworms
DSponges
Answer & Solution
Correct answer: D. Sponges
1. Porifera (sponges) have a unique water transport canal system.
2. Water enters through minute pores called ostia in the body wall.
3. It reaches a central cavity called spongocoel.
4. It exits through a single large opening called the osculum.
_Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.2.1_
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