Question 8 — Paridhi and Anusha of Grade - Questions at the end of the chapter - Chapter 9 Class 7 - Life Processes in Animals (Curiosity)

Last updated at August 10, 2026 by

Q 8
Question

Paridhi and Anusha of Grade 7 started running for their morning workout. After they completed their running, they counted their breaths per minute. Anusha was breathing faster than Paridhi. Provide at least two possible explanations for why Anusha was breathing faster than Paridhi.

🔗 Concept: 9.2.1 How Do We Breathe?

Question 8 — Paridhi and Anusha - Life Processes in Anim - Class 7 (Cu - Questions at the end of the chapter
Paridhi and Anusha after running, with different breathing rates
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Two possible explanations: different fitness levels, or different running intensity.

Explanation

  • Explanation 1 — Fitness level: Paridhi may be more physically fit than Anusha. A fitter person's body uses oxygen more efficiently — so they need less rapid breathing after exercise. Anusha, being less fit, needs to breathe faster to get enough oxygen.
  • Explanation 2 — Running intensity: Anusha may have run faster or with more intensity. When muscles work harder, they need more oxygen to release energy through respiration. The body breathes faster to supply this extra oxygen.
  • Explanation 3 — Body size or health: Anusha may have a larger body size or a respiratory condition that means her body needs to breathe more times per minute to get the same amount of oxygen as Paridhi.
After exercise, breathing rate increases to supply more oxygen for respiration. Fitter people or those who ran less intensely recover faster.
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