Solution of Chapter 17. Breathing and Exchange of Gases (Biology NCERT Book)

1 Define vital capacity. What is its significance?

2 State the volume of air remaining in the lungs after a normal breathing.

3 Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?

4 What are the major transport mechanisms for CO2? Explain.

5 What will be the pO₂ and pCO₂ in the atmospheric air compared to those in the alveolar air ?  (i) pO₂ lesser, pCO₂ higher(ii) pO₂ higher, pCO₂ lesser(iii) pO₂ higher, pCO₂ higher(iv) pO₂ lesser, pCO₂ lesser 

6 Explain the process of inspiration under normal conditions.

7 How is respiration regulated?

8 What is the effect of pCO₂ on oxygen transport?

9 What happens to the respiratory process in a man going up a hill?

10 What is the site of gaseous exchange in an insect?

11 Define the oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?

12 Have you heard about hypoxia? Try to gather information about it, and discuss with your friends.

13 Distinguish between  (a) IRV and ERV(b) Inspiratory capacity and Expiratory capacity.(c) Vital capacity and Total lung capacity. 

14 What is Tidal volume? Find out the Tidal volume (approximate value) for a healthy human in an hour.