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Biology CBSE Live product
Class 7 (2025-26)
Life processes in animals
Life processes in animals - Respiration in humans
9.
Respiratory structures, process, and health in humans
Question:
4
m.
Answer the following briefly:
1.
What role does the diaphragm play during inhalation and exhalation?
It contracts to decrease chest volume during inhalation and relaxes to increase volume during exhalation
It relaxes to increase chest volume during inhalation and contracts to decrease volume during exhalation
It contracts to increase chest volume during inhalation and relaxes to decrease volume during exhalation
2.
How would you prove that exhaled air contains more carbon dioxide than inhaled air at home?
Take normal water and breathe into it to see it turn milky due to reaction of carbon dioxide
Take lime water and breathe into it to see it turn milky due to reaction of carbon dioxide
Take lime water and breathe into it to see it turn milky due to reaction of oxygen
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