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UPSC 2003: Octopus is
(a)an arthropod
(b)an echinoderm
(c)a hemichordate
(d)a mollusc
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Not attemptedCorrect Answer: (d) a mollusc
Octopus belongs to phylum Mollusca (class Cephalopoda); it lacks the jointed appendages/exoskeleton of arthropods, the water‐vascular system of echinoderms and the rudimentary notochord of hemichordates. Hence option (d) is correct while the other three phyla do not include octopus. ([iasexamportal.com](https://iasexamportal.com/paper/IAS_General_Studies_Prelims_Paper_2003_part-1?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2003 Science & Technology question?▼
The correct answer is option (d): a mollusc. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2003, GS Paper 1, as Question 91. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.