Show the major events of evolution with the help of a chart. What are the roles of air sacs in the flight of pigeon? [3 + 2]
WBBSE
Class X
Life Science
04 (a) Evolution
04 (b) Adaptation
05 Mark
2025
The major events of evolution with the help of a chart
Roles of air sacs in pigeon’s flight are
- Reduce body weight: Air sacs are air-filled cavities that lower the specific gravity of the body, making the pigeon lighter for flight.
- Increase efficiency of respiration: They ensure a continuous supply of oxygen to the lungs, even during exhalation, which is essential during flight when energy demand is high.
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