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Question

Which is the second-largest phylum in the animal kingdom?


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Solution

Mollusca:

The second-largest phylum in the animal kingdom is Mollusca.

  1. It is characterized by shelled animals with a distinguishable head and foot region.
  2. They have comb-like gills called ctenidia.
  3. The body is covered by a calcareous shell that may be external or internalized.
  4. They exhibit an organ-level body organization.
  5. Higher members of the phylum have tentacles, well-defined eyes, and mouthparts.
  6. These are aquatic and marine organisms.
  7. These are triploblastic.
  8. These are bilaterally symmetrical and coelomate.
  9. Examples include snails, Chiton, Nautilus, Pinctada, etc.

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