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Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

1. Which sequence most accurately describes the sequence of airflow in the human respiratory system? 1. Pharynx 2. Bronchus 3. Trachea 4. Larynx 5. Alveolus 6. Bronchiole

1.4, 1, 3, 2, 6, 5

2.1, 4, 3, 2, 5, 6

3.1, 4, 3, 2, 6, 5

4.4, 1, 3, 2, 5, 6

2. Which of the following factors is the most effective in accelerating the rate of breathing in man?

1.A lack of oxygen in the tissues

2.An excess of carbon dioxide in the blood

3.An excess of carbon dioxide in the lungs

4.A lack of oxygen in the blood

3. When blood leaves the capillary bed most of the carbon dioxide is in the form of:

1.Bicarbonate ions

2.Hydroxyl ions

3.Carbonate ions

4.Hydrogen ions

4. With which other system do specialize respiratory systems most closely interface in exchanging gases between the cells and the environment?

1.The circulatory system

2.The muscular system

3.The excretory system

4.The skin

5. Respiratory pigments:

1.Attach to the alveolar wall

2.All have four haem groups

3.Combine reversibly with only oxygen

4.None of these

6. Pulmonary emphysema:

1.Results from bacterial infection

2.Characterized by loss of elasticity of the alveolar walls

3.Results from bronchial constriction

4.Is uncommon in cigarette smokers

7. Which of the following is the respiratory surface in human respiratory system?

1.Trachea

2.Larynx

3.Alveoli

4.Bronchi

8. Which of the following changes will increase the body’s rate of carbon dioxide excretion into the alveoli?

1.The breakdown of alveolar tissue as a result of disease

2.A decrease in the partial pressure of carbon dioxide in the alveolar air

3.A decrease in the pulmonary circulation

4.Holding the breath

9. When you inhale, the diaphragm?

1.Contracts and moves upward

2.Relaxes and moves downward

3.Relaxes and moves upward

4.Contracts and moves downward

10. The amount of air moved in and out of the lungs with each normal resting breath is the:

1.Vital volume

2.Tidal volume

3.Viral capacity

4.Residual capacity

11. Breathing is an example of

1.Cellular respiration

2.Counter current exchange

3.Ventilation

4.Diffusion

12. Which event is not associated with the activity of expiration?

1.More dome like shape of diaphragm

2.Relaxation of external intercostal muscles

3.Contraction of diaphragm

4.Backward and downward movement of rib cage

13. How is most of the oxygen transported in the blood?

1.As bicarbonate

2.Dissolved in plasma

3.Dissolved in water

4.Bound to hemoglobin

14. The lateral walls of the chest cavity of man are composed of the:

1.Ribs

2.Intercostals muscles

3.Ribs, intercostals muscles and diaphragm

4.Ribs, intercostals muscles

Test By Subject	Punjab
Test By Topics	12th Class Biology

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