A) ostractum
B) operculum
C) ommatophores
D) osphradium
Correct Answer: C
Solution :
In Mollusca, each eye is located upon a stumpy peduncle called ommatophore. In Mollusca, a loose skin fold, called mantle, dorsally convers most of the body and encloses a large mantle cavity. The mantle cavity contains the rectum, genital duct, a penis in males and a small bipectinate chemoreceptor called osphradium. In Mollusca, the large oval aperture or mouth of the shell can be tightly closed by a thick, plate-like operculum attached to the foot.
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