Question

1. During exhalation, ribs (a) move upwards. (b) move outwards. (c) move downwards. (d) do not move at all.

2. The normal range of breathing rate per minute in a normal adult at rest is (a) 9-12. (d) 24-30. (b) 12-24 (c) 21-24

3. During heavy exercise, athletes get cramps in the legs due to the accumulation of (a) lactic acid (b) alcohol. (c) carbon dioxide (d) water

4. The end products of respiration are (a) carbon dioxide and energy. (b) carbon dioxide and water. (c) carbon dioxide, water and energy (d) carbon dioxide and oxygen.

5. The process in which exchange of gases takes place is called (a) combustion. (b) respiration (c) breathing (d) cellular respiration.​

Answer 1

1. (a)
2. (b)
3. (a)
4. (b)
5. (b)

Explanation:

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