Question

10. RESPIRATION IN ORGANISMS
Observation:
Conclusion:
4) To check the presence of carbon dioxide in exhaled air.
Apparatus and materials :
Figure
Air is blown
from here​

Answer 1

Explanation:

Limewater can be used to detect carbon dioxide. If carbon dioxide is bubbled through limewater then it turns from clear to cloudy/milky in colour. This is why limewater used in a simple respirometer can show that more carbon dioxide is present in exhaled air compared to inhaled air.