Question:

In Mollusca, eye is present over a stalk, called :

Updated On: Jun 20, 2022
  • ostractum
  • operculum
  • ommatophores
  • osphradium
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The Correct Option is C

Solution and Explanation

In mollusca, each eye is located upon a stumpy peduncle called ommatophore. In mollusca, a loose skin fold, called mantle, dorsally covers 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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Concepts Used:

Animal Kingdom

Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.

Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.

The different phyla of the Kingdom Animalia are as follows:

  1. Porifera
  2. Coelenterata (Cnidaria)
  3. Platyhelminthes
  4. Nematoda
  5. Annelida
  6. Arthropoda
  7. Mollusca
  8. Echinodermata
  9. Hemichordata
  10. Chordata

Read More: Classification of Animal Kingdom