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Why do we often sneeze when we inhale a lot of dust-laden air?

NCERT Solutions for Class 7th Science Chapter 10 Respiration in Organisms Page 118 Exercise Question 3


Sneezing expels the foreign particles from the inhaled air, so that only clean air enters our body. It usually occurs because of the irritation in the upper breathing passage. This irritation happens when we inhale some unwanted particles and they get trapped in our nasal cavity. Smoke, dust, pollen, etc. are some of the unwanted particles that may cause sneezing.
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