Question 7 โ€” We often sneeze when we - Questions at the end of the chapter - Chapter 9 Class 7 - Life Processes in Animals (Curiosity)

Last updated at June 1, 2026 by

Q 7
Question

We often sneeze when we inhale a lot of dust-laden air. What can be possible explanations for this?

๐Ÿ”— Concept: 9.2.1 How Do We Breathe?

Question 7 โ€” We often sneeze whe - Life Processes in Anim - [Teachoo] - Questions at the end of the chapter
Sneezing as a protective reflex against dust
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Sneezing is a protective reflex that removes dust and irritants from the nose.

Explanation

  • When we inhale dust-laden air, dust particles enter through the nostrils.
  • Tiny hair and mucus in the nasal passages trap most of the dust, but some particles can irritate the lining of the nasal passages.
  • This irritation triggers a sneezing reflex โ€” sneezing forcefully expels air from the nose and mouth.
  • This removes the irritating dust particles and prevents them from going deeper into the respiratory system (windpipe and lungs).
Sneezing is the body's defence mechanism to clear dust and irritants from the nose before they reach the lungs.
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