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प्रश्न
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 walking, watching T.V
उत्तर
Sleeping < Watching T.V. < Brisk walk < Cycling
Breathing rate changes according to the requirement of oxygen by the body. It slows down when a person is taking complete rest. Whenever a person does any activity, the breathing rate becomes faster. It further increases with strenuous work to provide more oxygen to the cells to get more energy.
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संबंधित प्रश्न
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| Column I | Column II | ||
| (a) | Yeast | (i) | Earthworm |
| (b) | Diaphragm | (ii) | Gills |
| (c) | Skin | (iii) | Alcohol |
| (d) | Leaves | (iv) | Chest cavity |
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| (vii) | Tracheae |
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Frogs can breathe through their skin as well as lungs.
Match the names of organisms in Column I with their organs of breathing given in Column II.
| Column I | Column II | ||
| (a) | Butterfly | (i) | Lungs |
| (b) | Earthworms | (ii) | Gills |
| (c) | Sparrow | (iii) | Spiracles |
| (d) | Fish | (iv) | Skin |
