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UPSC 2002: Which one of the following statements is correct?
(a)All echinoderms are viviparous
(b)Round worm has no circulatory system
(c)In bony fishes, swim bladder is usually present
(d)In cartilaginous fishes, fertilisation is internal
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Not attemptedCorrect Answer: (a) All echinoderms are viviparous
Most echinoderms (starfish, sea urchins, etc.) spawn eggs into seawater for external fertilisation; they are NOT viviparous, making statement (a) incorrect ([britannica.com](https://www.britannica.com/science/animal-reproductive-system/Arthropods?utm_source=openai)). The other three statements are correct: nematodes (roundworms) lack a circulatory system ([kids.britannica.com](https://kids.britannica.com/students/article/invertebrate/275081?utm_source=openai)); most bony fishes possess a swim bladder for buoyancy ([britannica.com](https://www.britannica.com/science/swim-bladder?utm_source=openai)); and sharks and other cartilaginous fishes have internal fertilisation using claspers ([britannica.com](https://www.britannica.com/science/How-Do-Fish-Reproduce?utm_source=openai)). Because the question asks for the statement that is NOT correct, option (a) is the right choice.
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Frequently Asked Questions
What is the correct answer to this UPSC 2002 Science & Technology question?▼
The correct answer is option (a): All echinoderms are viviparous. 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 2002, GS Paper 1, as Question 127. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
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.