There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why?

1. They can accumulate in the environment, and contaminate water and soil.
2. They can enter the food chains.
3. They can trigger the production of free radicals.

Select the correct answer using the code given below.

1. 1 and 2 only
2. 3 only
3. 1 and 3 only
4. 1, 2 and 3

Explanation

All concerns are correct

• Accumulation in the environment: Nanoparticles can persist in soil and water, leading to long-term contamination. Their small size allows them to interact with environmental components in unique and potentially harmful ways.
• Entry into food chains: Due to their small size and mobility, nanoparticles can enter aquatic systems or be absorbed by plants. This makes their entry into food chains possible, posing risks to both animals and humans.
• Triggering free radicals: Nanoparticles can induce oxidative stress by generating free radicals. This may lead to cellular damage in living organisms, contributing to health issues like inflammation or even carcinogenesis.
  • A free radical is defined as a molecule with at least one unpaired valence electron, making it chemically reactive and unstable. In the context of neuroscience, free radicals are oxygen-containing species that can lead to oxidative stress and damage important molecules in the body.

Answer: (d) 1, 2 and 3; Difficulty Level: Easy