Question

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

Answer 1

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.

Answer 2

When we inhale dust laded air dust particles are captured within the nostrils sometimes they get past the nostrils hair in the nasal cavity and irritation the linning of the cavity as a result we seenze. Sneezing expels these foregion particles from the inhALed air AnD a dust free clean air enTErs in our body...