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UPSC 2025: Consider the following statements: I. No virus can survive in ocean waters. II. No virus can infect bacteria. III. No virus can change the cellular transcriptional activity in host cells. How many of the statements given above are correct?
(a)Only one
(b)Only two
(c)All the three
(d)None
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Not attemptedCorrect Answer: (d) None
All three statements are false: marine waters teem with ~10⁶–10¹¹ virus particles mL⁻¹, including many bacteriophages; bacteriophages are viruses that specifically infect bacteria; and numerous viruses (e.g., EBV, influenza) actively reprogram host-cell transcription to favour viral replication. Therefore none of the statements is correct. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Marine_viruses?utm_source=openai))
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What is the correct answer to this UPSC 2025 Science & Technology question?▼
The correct answer is option (d): None. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Health & Diseases question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2025, GS Paper 1, as Question 49. It falls under Science & Technology > Health & Diseases.
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 Health & Diseases?▼
UPSC has asked 86 questions from Health & Diseases (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.