Identify the phylum where animals are MOSTLY HERMAPHRODITE (eggs and sperms in the same individual) and have an open canal system with ostia and osculum.
ACoelenterata
BArthropoda
CAnnelida
DPorifera — sexes not separate (hermaphrodite); water flows via ostia → spongocoel → osculum
Answer & Solution
Correct answer: D. Porifera — sexes not separate (hermaphrodite); water flows via ostia → spongocoel → osculum
Sponges (Porifera) are typically hermaphrodites — same individual produces both gametes. Fertilisation internal; indirect development through larval stage. Water enters via ostia, exits via osculum. Skeleton: spicules or spongin fibres.
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