Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q91 (IAS/2003) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Animal diversity behaviour Answer Verified

Octopus is

Result
Your answer: —  Â·  Correct: D
Explanation

Octopuses are members of the phylum Mollusca and specifically belong to the class Cephalopoda (which includes squids and cuttlefish). Standard texts list octopus explicitly among mollusks, alongside clams, snails and squids, confirming their molluscan affinity [1]. Authoritative overviews of octopus biology likewise state that octopuses are cephalopods within the molluscan group, emphasizing their close relationship to other molluscs despite their distinct morphology and loss or reduction of an external shell in many species [2]. Thus, octopus is correctly classified as a mollusc, not an arthropod, echinoderm, or hemichordate.

Sources

  1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 9: Indian Biodiversity Diverse Landscape > Mollusks > p. 155
  2. [2] https://www.sciencedirect.com/topics/medicine-and-dentistry/common-octopus
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
37%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

IAS · 2002 · Q127 Relevance score: -2.47

Which one of the following statements is not correct ?

IAS · 2009 · Q86 Relevance score: -4.32

With reference to the evolution of living organisms, which one of the following sequences is correct ?

CDS-I · 2002 · Q68 Relevance score: -5.37

Consider the following statements regarding different types of animals: 1. Cnidarians are acoelomate 2. All sponges (Porifera) are marineare marine 3. Flatworms (Platyhelminthes) can produce asexually 4. In arthropods, fertilisation is always internal. Which of these statements is/are correct?