On average, an adult human being at rest breathes 15–18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and give a reason for your answer. sleeping, cycling, brisk walk, watching T.V.
ScienceClass 7CBSEAnswered 27 Mar 2026
Answer
Soln:
sleeping > watching T.V. > brisk walk > cycling
When a person performs a physical activity, breathing becomes faster. Because of this, more oxygen is required by the cells to get more energy.
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