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Opening on the upper side of spongocoel _________

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Opening on the upper side of spongocoel _________

(a) Osculum

(b) Cnidoblasts

(c) Spicules

(d) Ostia

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I'm obligated to ask this question of Classification of Animal Kingdom into Different Phylum-1 in division Animal Kingdom of Biology – Class 11

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The correct choice is (a) Osculum

For explanation I would say: Minute pores called Ostia let water into a central cavity called spongocoel. An opening on the upper side of the spongocoel that helps in egestion of water is called as Osculum.

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