Question

Which of the following statements are true about respiration?
(i) during inhalation, ribs move inward and diaphragm is raised. (ii) the gaseous exchange takes place in the alveoli.
(iii) haemoglobin has greater affinity for carbon dioxide than oxygen.
(iv) alveoli increase surface area for the exchange of gases

• A. (i) and (iv)
• B. (ii) and (iv)
• C. (ii) and (iii)
• D. (i) and (iii)

Answer 1

The correct option is B (ii) and (iv)

Correct answer: (d) (ii) and (iv)

Gaseous exchange occurs in the millions of alveoli in the lungs and the capillaries that envelop them.

As Alveoli is the site for gaseous exchange ,they increase the surface area for facilitating the process of diffusion of gases.