UPSC Prelims 2003·GS1·science-and-technology·science and technology

Octopus is

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Last updated 23 May 2026, 3:31 pm IST
  1. Aan arthropod
  2. Ban echinoderm
  3. Ca hemichordate
  4. Da molluscCorrect

Explanation

Octopus belongs to the phylum Mollusca. It is specifically classified under the class Cephalopoda, which includes marine animals characterized by a prominent head and a set of arms or tentacles. Unlike many other molluscs like snails or clams, octopuses have a soft body and lack an external shell. They are grouped in this phylum because of their biological structure, including a mantle and a highly developed nervous system. Options A, B, and C are incorrect because octopuses do not possess the jointed legs of arthropods, the spiny skin of echinoderms, or the specific anatomical features of hemichordates.
science-and-technology: Octopus is

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