When 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?

1. A

   1 and 2 only

   1 and 2 only. Artificial capillaries as a working implant are not keyed; biodegradability is.

2. B

   2, 3 and 4 only

   2, 3 and 4 only. Keeps the capillary over-claim.

3. C

   1, 3 and 4 only

   1, 3 and 4 only. Drug/antigen carriers, biochemical sensors, and biodegradable CNTs. Statement 2’s artificial capillaries is the miss.

4. D

   1, 2, 3 and 4

   All four. Statement 2 is not counted.

Summary. Official key is (c) 1, 3 and 4 only. Carbon nanotubes can carry drugs/antigens, serve in sensors, and can be biodegradable. Turning them into artificial blood capillaries is not the keyed use.