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Solution


Q.

During respiration exchange of gases takes place in :
1 Trachea and larynx  
2 Alveoli of lungs  
3 Alveoli and throat  
4 Throat and larynx  

Ans.

(2)

The air sacs in lungs are known as alveoli. The alveoli are the sites where exchange of the gases takes place. The concentration of oxygen gas in the alveoli is higher than that in the blood during inhalation, therefore it diffuses into the blood. Concentration of carbon dioxide is more in the blood than that in the alveoli during exhalation, thus it diffuses into the alveoli.