Question 3 โ€” What is the role of - Questions at the end of the chapter - Chapter 9 Class 7 - Life Processes in Animals (Curiosity)

Last updated at June 1, 2026 by

Q 3
Question

What is the role of the diaphragm in breathing?

  • (i) To filter the air
  • (ii) To produce sound
  • (iii) To help in inhalation and exhalation
  • (iv) To absorb oxygen

๐Ÿ”— Concept: 9.2.1 Respiration in Humans

Question 3 โ€” What is the role of - Life Processes in Anim - [Teachoo] - Questions at the end of the chapter
Air is drawn in Air is forced out Ribs move outwards Ribs move back Diaphragm moves downward Diaphragm moves upward
Diaphragm movement during inhalation and exhalation
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Correct option: (iii) To help in inhalation and exhalation.

Explanation

  • The diaphragm is a dome-shaped muscle below the lungs.
  • During inhalation: it moves downward, increasing chest space so air enters the lungs.
  • During exhalation: it moves upward, reducing chest space and pushing air out of the lungs.
The diaphragm controls breathing by changing the space inside the chest.
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