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Question

The air around us has various types of unwanted particles, such as:
  1. Dust
  2. Smoke
  3. Pollens
  4. All of the above

A
Smoke
B
Dust
C
Pollens
D
All of the above
Solution
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  • The air around us has various types of unwanted suspended particles like- smoke, dust, pollens etc.
  • When we inhale these particles get trapped in the hair present in our nasal cavity. However, sometimes these particles may get past the hair present in our nasal cavity. which may irritate the lining of the cavity as a result of which we sneeze.
  • Sneezing expels these foreign particles from the inhaled air.
Therefore, the correct answer is option D.

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