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Class 11 Biology MCQ Chapter 14 Breathing And Exchange of Gases
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Breathing And Exchange of Gases
Chapter – 14
| UNIT – (V) HUMAN PHYSIOLOGY |
| MCQ |
1. Gaseous exchange is held by ____________.
(a) Osmosis.
(b) Simple diffusion.
(c) Facilitated diffusion.
(d) Co-transport.
Ans: (b) Simple diffusion.
2. Which one of the following does not consist diffusion membrane?
(a) Thin squamous epithelium of alveoli.
(b) Cuboidal epithelium of alveoli.
(c) Basement membrane.
(d) Endothelium of blood capillaries.
Ans: (b) Cuboidal epithelium of alveoli.
3. On which of the following factors diffusion does not depend?
(a) Solubility of gases.
(b) Thickness of the respiratory membrane.
(c) Partial pressure difference.
(d) Molecular weight of gases.
Ans: (d) Molecular weight of gases.
4. Which of the following is removed from our body by the lungs?
(a) CO2 only.
(b) H2O only.
(c) CO2 and H2O.
(d) None of the above.
Ans: (c) CO2 and H2O.
5. Why does oxygen move through the alveoli blood capillaries of the lungs?
(a) Differences in the O2 tension and partial pressure of these chambers.
(b) The partial pressure of CO2
(c ) Union of O2 with haemoglobin.
(d) All of the above.
Ans: (d) All of the above.
6. Partial Pressure of oxygen is equal to:
(a) Deoxygenated Blood and tissues.
(b) Alveoli and Oxygenated Blood.
(c) Alveoli and Deoxygenated Blood.
(d) Air and Alveoli.
Ans: (c) Alveoli and Deoxygenated Blood.
7. The volume of air inspired or expired during normal respiration is called:
(a) Tidal Volume.
(b) Residual Volume.
(c) Vital Capacity.
(d) Total Lung Capacity.
Ans: (a) Tidal Volume.
8. Does the polluted air contain unusually high concentrations inhaled by the patient?
(a) Carbon disulfide.
(b) Chloroform.
(c) Carbon dioxide.
(d) Carbon monoxide gas.
Ans: (d) carbon monoxide gas.
9. Mark incorrect statements about respiratory system function.
(a) Humidify the air.
(b) Warm the air.
(c) Diffusion of gas.
(d) purify the air.
Ans: (d) purify the air.
10. Which law explains the inverse relationship between pressure and volume during breathing?
(a) Dalton’s Law.
(b) Henry’s Law.
(c) Boyle’s Law.
(d) Charles’s Law.
Ans: (c) Boyle’s Law.
11. In humans, which of the following is the primary respiratory pigment responsible for oxygen transport?
(a) Haemoglobin.
(b) Myoglobin.
(c) Hemocyanin.
(d) Chlorophyll.
Ans: (a) Haemoglobin.
12. During inhalation, which muscle contracts to increase the volume of the thoracic cavity?
(a) Diaphragm.
(b) Intercostal muscles.
(c) Abdominal muscles.
(d) Pectoral muscles.
Ans: (a) Diaphragm.
13. The exchange of gases in the alveoli of the lungs occurs between:
(a) Oxygen and nitrogen.
(b) Oxygen and carbon dioxide.
(c) Carbon dioxide and nitrogen.
(d) Oxygen and water vapour.
Ans: (b) Oxygen and carbon dioxide.
14. Which of the following respiratory disorders is characterized by chronic inflammation and narrowing of the airways?
(a) Pneumonia.
(b) Tuberculosis.
(c) Asthma.
(d) Emphysema.
Ans: (c) Asthma.
15. What is the role of surfactant in the alveoli of the lungs?
(a) It transports oxygen in the blood.
(b) It reduces surface tension, preventing alveolar collapse.
(c) It promotes carbon dioxide diffusion.
(d) It facilitates mucus production.
Ans: (b) It reduces surface tension, preventing alveolar collapse.
