Hello aspirant,

Following are the important topics from class 11 NCERT chapter Breathing and exchange of gases-

1. MECHANISM OF BREATHING- INSPIRATION AND EXHALATION PROCESS AND MOVEMENT OF DIAPHRAGM

2. RESPIRATORY VOLUMES AND TIDAL CAPACITIES- DEFINITIONS AND MAXIMUM VOLUMES

3. TABLE 17.1 OF PARTIAL PRESSURES OF OXYGEN AND CARBON DIOXIDE VALUES

4. TRANSPORT OF OXYGEN AND CARBON DIOXIDE

5. DISORDERS OF THE RESPIRATORY SYSTEM

Also, please read the lines carefully as anything can be asked in a question format.

Hope it helps!