With reference to carbon nanotubes, consider the following statements: 1. They can be used as carriers of drugs and antigens in the human body. 2. They can be made into artificial blood capillaries for an injured part of human body. 3. They can be used in biochemical sensors. 4. Carbon nanotubes are biodegradable. Which of the statements given above are correct?
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A hard Science & Technology multiple-choice question from UPSC Prelims 2020. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: D. 1, 2, 3 and 4
Per the official key, all four statements are correct — carbon nanotubes can carry drugs/antigens, form artificial capillaries and serve in biochemical sensors, and certain functionalised nanotubes can be enzymatically biodegraded. (Statement 4 was contested; the answer follows the official key.)
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