Q-3. On an 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 reason for your answer.
brisk walk
cycling
sleeping
watching T.V.
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Answer: Sleeping > watching T.V. > brisk walk > cycling. Whenever a person does an activity, the breathing rate becomes faster.
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