Q. Consider the following statements:
1. Other than those made by humans, nanoparticles do not exist in nature.
2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics.
3. Nanoparticles of some commercial products which enter the environment are unsafe for humans.
Which of the statements given above is/are correct?
a) 1 only
b) 3 only
c) 1 and 2
d) 2 and 3
Correct Answer: d) 2 and 3
Question from UPSC Prelims 2022 GS Paper
Explanation :
Nanoparticles: Natural Occurrence and Industrial Use
The correct answer is d) 2 and 3.
Here’s why:
Natural Occurrence of Nanoparticles
The first statement is incorrect because nanoparticles do exist in nature without human intervention. For example, volcanic ash, ocean spray, and mineral composites in the earth’s crust can all contain naturally occurring nanoparticles.
Use of Nanoparticles in Cosmetics
The second statement is correct. Nanoparticles of some metallic oxides, such as titanium dioxide and zinc oxide, are indeed used in the manufacture of cosmetics, particularly in sunscreens, where they help to provide protection against UV rays.
Environmental and Health Impacts of Nanoparticles
The third statement is also correct. There is concern about the environmental and health impacts of nanoparticles from commercial products. When these particles enter the environment, they can have unpredictable effects due to their small size and high reactivity. They can enter the food chain and potentially cause harm to human health, although the extent and nature of the risks are still under investigation.
Therefore, statements 2 and 3 are correct, making option d) the right answer.
