NEET2012BotanyEnvironmental IssuesActual
Select the correct statement.
Options
- AParticulate matter of size 10 m can create severe damage to the lungs.
- BParticulate matter of size greater than 2.5 m can get trapped in lungs and cause problems.
- CParticulate matter of size less than 2.5 m penetrate deep into lungs.
- DNone of the above.
Correct answer
C. Particulate matter of size less than 2.5 m penetrate deep into lungs.
Step-by-step solution
Particulate matter mainly includes dust, soot particles, volatile hydrocarbons, some sulphate and metallic residues emitted into the air by sources such as factories, power plants, vehicles, etc. PM is usually divided into different classes based on size ranging from total suspended matter (TSP) to PM-10 (particles with diameter of 10 or less) to PM-2.5 (particles with diameter of 2.5 or less). Smallest particles pose highest human health risk. Larger particles ( 10 ) can easily be expelled from lungs through mucus