Question

Which of the following statement(s) is (are) true about respiration? 

(i) During inhalation, ribs move inward and the diaphragm is raised 

(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air 

(iii) Hemoglobin has greater affinity for carbon dioxide than oxygen 

(iv) Alveoli increase surface area for exchange of gases 

(a) (i) and (iv) 

(b) (ii) and (iii) 

(c) (i) and (iii) 

(d) (ii) and (iv)

Answer 1

The answer is (d) (ii) and (iv)

• Statement (i) is wrong because ribs move outward and diaphragm is lowered during inhalation.
• Similarly Option (iii) is wrong because Hemoglobin has greater affinity for Oxygen than CO₂