This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Biology > Class 11 Biology Chapter 17 Breathing And Exchange Of Gases – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In man and mammals, air passes from outside into the lungs through A) Nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli. B) Nasal cavity, larynx, pharynx, larynx, trachea, bronchi, alveoli. C) Nasal cavity, larynx, pharynx, trachea, bronchioles, alveoli. D) Nasal cavity, pharynx, larynx, trachea, bronchioles, bronchi, alveoli. Show Answer Correct Answer: A) Nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli. 2. Which one of the following statement is incorrect? A) The presence of non-respiratory air sacs, increases the efficiency of respiration in birds. B) The principal of countercurrent flow facilitates efficient respiration in gills of fishes. C) The residual air in lungs slightly decreases the efficiency of respiration in mammals. D) In insects, circulating body fluids serve to distribute oxygen to tissues. Show Answer Correct Answer: D) In insects, circulating body fluids serve to distribute oxygen to tissues. 3. Which of the following is the respiratory organ of scorpion? A) Ctenidia. B) Gills. C) Lungs. D) Book lungs. Show Answer Correct Answer: D) Book lungs. 4. Which of the following is NOT a function of the lungs? A) Metabolism. B) Serves as a reservoir of blood for the left ventricle. C) It is a filter to protect the systemic vasculature. D) All of the above are true. Show Answer Correct Answer: D) All of the above are true. 5. Exchange of gases- A) Occurs between the alveoli and pulmonary blood capillary. B) Occurs between blood and tissues. C) By diffusion. D) All. Show Answer Correct Answer: D) All. 6. The largest proportion of CO$_{2}$ carried by blood is in the form of- A) Molecular CO$_{2}$ dissolved in the plasma. B) Bicarbonates (HCO$_{3}$$^{-}$ ) carried within RBCs. C) HCO$_{3}$$^{-}$ carried in the plasma. D) Molecular CO$_{2}$ chemically bound to haemoglobin. Show Answer Correct Answer: C) HCO$_{3}$$^{-}$ carried in the plasma. 7. Oxygen dissociation curve is- A) Zig-zag. B) L-shaped. C) J-shaped. D) S-shaped. Show Answer Correct Answer: D) S-shaped. 8. CO$_{2}$ dissociates from carbamino haemoglobin when A) PCO2 is high and pO2 is low. B) PO2 is high and pCO2 is low. C) PCO2 and pO2 are equal. D) None of the above. Show Answer Correct Answer: B) PO2 is high and pCO2 is low. 9. Given below are few respiratory disorders. Identify occupational respiratory disorders among these.i) Coryza ii) SARSiii) Silicosis iv) Asbestosis v) Emphysema A) (i) and (ii). B) (i) and (v). C) (iii) and (iv). D) (i), (ii) and (v). Show Answer Correct Answer: C) (iii) and (iv). 10. The vital capacity of the lung signifies the volume of air breathed in: A) During normal inspiration. B) With forcible expiration. C) With forcible inspiration. D) With deep inspiration and exhaled out by forcible expiration. Show Answer Correct Answer: D) With deep inspiration and exhaled out by forcible expiration. 11. After deep inspiration, maximum expiration of lungs is called A) VC. B) EC. C) TLC. D) IC. Show Answer Correct Answer: A) VC. 12. The maximum volume of air contained in the lung by a full forced inhalation is called(a) Vital capacity(b) Tidal volume(c) Total lung capacity(d) Inspiratory capacity A) Vital capacity. B) Tidal volume. C) Total lung capacity. D) Inspiratory capacity. Show Answer Correct Answer: C) Total lung capacity. 13. Epiglottis is a- A) Made up of only muscles. B) Bony flap. C) Cartilaginous flap. D) Half bony half cartilaginous. Show Answer Correct Answer: C) Cartilaginous flap. 14. Regarding the function of conducting system, mark the wrong entry? A) Cleans up the air. B) Warms up the air. C) Diffusion of gases. D) Brings the air to body temperature. Show Answer Correct Answer: C) Diffusion of gases. 15. Air pathway in conducting zone: A) Nose$\rightarrow$mouth$\rightarrow$lungs. B) Trachea$\rightarrow$lungs$\rightarrow$larynx$\rightarrow$pharynx$\rightarrow$alveoli. C) Nose$\rightarrow$larynx$\rightarrow$pharynx$\rightarrow$bronchus$\rightarrow$alveoli$\rightarrow$bronchioles. D) Nostrils$\rightarrow$pharynx$\rightarrow$larynx$\rightarrow$trachea$\rightarrow$bronchi$\rightarrow$bronchiles$\rightarrow$alveoli. Show Answer Correct Answer: D) Nostrils$\rightarrow$pharynx$\rightarrow$larynx$\rightarrow$trachea$\rightarrow$bronchi$\rightarrow$bronchiles$\rightarrow$alveoli. 16. What percentage of carbon dioxide transport in the form of carbamino haemoglobin? A) 40-50%. B) 20-25%. C) 50-60%. D) 10-15%. Show Answer Correct Answer: B) 20-25%. 17. Which one of the following is not correct regarding Thoracic chamber? A) It is an air tight chamber. B) It is formed dorsally by vertebral column. C) It is formed ventrally by clavicle . D) Formed by Diaphragm on lower side. Show Answer Correct Answer: C) It is formed ventrally by clavicle . 18. During exhalation, the ribs become depressed as the intercostal muscles relax-Thus the lung volume decreases which increases the alveolar pressure. What does this cause? A) Air flows from the area of lower pressure in the alveoli to the area of higher pressure in the atmosphere. B) Air flows from the area of higher pressure in the alveoli to the area of lower pressure in the atmosphere. C) All the above. D) None of the above. Show Answer Correct Answer: B) Air flows from the area of higher pressure in the alveoli to the area of lower pressure in the atmosphere. 19. If there is inflammation of pleural membranes ..... What will happen? A) No effect. B) No pain. C) Decreased friction between 2 pleura. D) Increased friction between between 2 pleura. Show Answer Correct Answer: D) Increased friction between between 2 pleura. 20. What is the process of breaking down food using oxygen called? A) Oxidation. B) Digestion. C) Fermentation. D) Respiration. Show Answer Correct Answer: A) Oxidation. 21. Which of the following statements is true about Trachea in a respiratory system? (a) It functions as passages of air to each alveolus (b) It functions for sound production (c) It Acts as passage of air to bronchi (d) It Lowers the surface tension A) It Acts as passage of air to bronchi. B) It functions as passages of air to each alveolus. C) It functions for sound production. D) It Lowers the surface tension. Show Answer Correct Answer: A) It Acts as passage of air to bronchi. 22. Arrange the following components of pulmonary volume in the order of their increasing values. (I) Tidal volume (II) Residual volume (III)Expiratory reserve volume (IV)Vital capacity. Choose the correct option: A) I < IV < II < III. B) I < IV < III < II. C) I < II < III < IV. D) I < III < II < IV. Show Answer Correct Answer: D) I < III < II < IV. 23. Which animal breathe through lungs? A) Crab. B) Dragonfly. C) Jellyfish. D) Turtle. Show Answer Correct Answer: D) Turtle. 24. Trachea is lined with incomplete rings of: A) Calcified cartilage. B) Fibrous cartilage. C) Hyaline cartilage. D) Elastic cartilage. Show Answer Correct Answer: C) Hyaline cartilage. 25. Which is not true . A) PCO2 of deoxygenated blood is 95 mm Hg. B) PO2 alveolar air is 104 mm Hg. C) PCO2 of alveolar air is 40 mm Hg. D) PO2 of oxygenated blood is 95 mm Hg. Show Answer Correct Answer: A) PCO2 of deoxygenated blood is 95 mm Hg. 26. Select the correct events that occur during inspiration. I. Contraction of diaphragm. II. Contraction of external inter-costal muscles. III. Pulmonary volume decreases. IV. Intra pulmonary pressure increases. A) III and IV. B) I, II and IV. C) Only IV. D) I and II. Show Answer Correct Answer: D) I and II. 27. Each lung is covered by a double-layered protective covering called A) Pulmonary membrane. B) Ribs. C) Pleural membrane. D) Pleural fluid. Show Answer Correct Answer: C) Pleural membrane. 28. Oxygen diffuses from A) Lung to trachea. B) Blood capillary to alveolus. C) Trachea to lung. D) Alveolus to blood capillary. Show Answer Correct Answer: D) Alveolus to blood capillary. 29. What is the main function of the respiratory system? A) To provide oxygen and remove carbon dioxide from the body. B) To bring oxygen to the body. C) To break down food and absorb nutrients. D) To remove oxygen from the body and deliver carbon dioxide. Show Answer Correct Answer: A) To provide oxygen and remove carbon dioxide from the body. 30. Sites of gaseous exchange in lungs are- A) Pleura. B) Bronchioles. C) Tracheoles. D) Alveoli. Show Answer Correct Answer: D) Alveoli. 31. What pressure gradient is exhalation triggered by? A) The pressure in the lungs is less than the pressure of the atmosphere. B) The pressure in the lungs is greater than the pressure of the atmosphere. C) All the above. D) None of the above. Show Answer Correct Answer: B) The pressure in the lungs is greater than the pressure of the atmosphere. 32. Partial pressure of oxygen in alveolar air is ..... A) 125 mm Hg. B) 100 mmHg. C) 104 mmHg. D) 45 mmHg. Show Answer Correct Answer: C) 104 mmHg. 33. What is the red coloured iron containing pigment present in RBCs? A) Haemoglobin. B) Chlorophyll. C) Melanin. D) Myoglobin. Show Answer Correct Answer: A) Haemoglobin. 34. Which diseases do not occur due to infection of bacteria or virus? A) Pneumonia. B) Asbestosis. C) Bronchitis. D) All of the above. Show Answer Correct Answer: B) Asbestosis. 35. Number of lobes present in human lungs: A) 3 in right lung and 2 in left lung. B) 2 in right lungs and 3 in left lung. C) 2 in right lungs and 2 in left lung. D) 3 in right lung and 1 in left lung. Show Answer Correct Answer: A) 3 in right lung and 2 in left lung. 36. Chemical receptors checks amount of ..... in blood. A) CO2, O2. B) CO2, O2 and pH. C) CO2. D) O2. Show Answer Correct Answer: B) CO2, O2 and pH. 37. Tidal volume and respiratory reserve volume of an athlete 500 ml and 1000 ml respectively what will be his respiratory capacity if the residual volume is 1200 ml? A) 1700 ml. B) 2200 ml. C) 1500 ml. D) 2700 ml. Show Answer Correct Answer: C) 1500 ml. 38. A large proportion of oxygen remains unused in the human blood even after its uptake by the body tissues. This O2 A) Raises the pCO2 of blood to 75 mm of Hg. B) Is enough to keep oxyhaemoglobin saturation at 96%. C) Acts as a reserve during muscular exercise. D) Helps in releasing more O2 to the epithelial tissues. Show Answer Correct Answer: C) Acts as a reserve during muscular exercise. 39. Alveoli have a ..... A) Dry lining for dissolving gases. B) Moist lining for dissolving gases. C) Moist lining for dissolving glucose. D) Dry lining for dissolving glucose. Show Answer Correct Answer: B) Moist lining for dissolving gases. 40. What happens when the intercostals contract during inhalation? A) The size of the thoracic cavity decreases. B) Pressure in the lungs increases. C) The ribs are elevated. D) The diaphragm relaxes. Show Answer Correct Answer: C) The ribs are elevated. 41. Maximum amount of oxygen is lost from the blood in the A) Capillaries surrounding the alveoli. B) Arteries of the body. C) Capillaries surrounding the tissue cells. D) Left auricle of the heart. Show Answer Correct Answer: A) Capillaries surrounding the alveoli. 42. The respiratory disorder which leads to irreversible distension and loss of elasticity of alveoli of lungs is A) Bronchial asthma. B) SARS. C) Bronchitis. D) Emphysema. Show Answer Correct Answer: D) Emphysema. 43. What is the term for the amount of air that is left in the lungs after a maximal exhalation? A) Residual volume. B) Inspiratory reserve volume. C) Expiratory reserve volume. D) Tidal volume. Show Answer Correct Answer: A) Residual volume. 44. Exchange of gases at respiratory surface occurs by which process? A) Simple diffusion. B) Facilitated diffusion. C) Active transport. D) All of the above. Show Answer Correct Answer: A) Simple diffusion. 45. The solubility of carbon dioxide is about ..... times higher than that of oxygen across the respiratory membrane A) 200-250. B) 25-50. C) 125-150. D) 20-25. Show Answer Correct Answer: D) 20-25. 46. Deoxygenated blood from heart comes to lungs via(a) pulmonary vein(b) systemic vein(c) pulmonary artery(d) systemic artery A) Systemic vein. B) Systemic artery. C) Pulmonary vein. D) Pulmonary artery. Show Answer Correct Answer: D) Pulmonary artery. 47. IN which disease, due to flattening of tracheal vessels, alveoli are deprived of oxygen? A) Pneumonia. B) Emphysema. C) Asthma. D) Bronchitis. Show Answer Correct Answer: B) Emphysema. 48. Mark the incorrect statement in context to O$_{2}$ binding to Hb A) Lower pCO$_{2}$. B) Higher pH. C) Higher pO$_{2}$. D) Lower temperature. Show Answer Correct Answer: C) Higher pO$_{2}$. 49. Large part of nose enclosed by bone of cranium ..... A) External nares. B) Nasal chamber. C) Internal nares. D) A and c both. Show Answer Correct Answer: B) Nasal chamber. 50. Gaseous exchange takes place through diffusion membrane. Which of the following is not related to diffusion membrane. A) Endothelium of alveolar capillaries. B) A basement membrane. C) Its total thickness is more than a millimetre. D) Thin squamous epithelium of alveoli. Show Answer Correct Answer: C) Its total thickness is more than a millimetre. 51. What percentage of CO2 is transported by RBCs ..... A) 7%. B) 97 %. C) 20-25%. D) 70%. Show Answer Correct Answer: C) 20-25%. 52. Total lung capacity is: A) Total volume of air accommodated in lungs at the end a forced inspiration. B) RV + ERV + TV + IRV. C) Vital capacity + residual volume. D) All of the above. Show Answer Correct Answer: D) All of the above. 53. Solubility of carbon dioxide is ..... times higher than that of Oxygen A) 20. B) 40. C) 60. D) 10. Show Answer Correct Answer: A) 20. 54. The oxygen dissociation curve will show a right shift in case of: A) Low H+ concentration. B) High pCO2. C) Low pCO2. D) High pO2. Show Answer Correct Answer: B) High pCO2. 55. Known as the voice box A) Windpipe. B) Larynx. C) Pharynx. D) Epiglottis. Show Answer Correct Answer: B) Larynx. 56. Normally epiglottis remains closed in which condition? A) During yawning. B) While drinking water. C) Speaking. D) A and b. Show Answer Correct Answer: B) While drinking water. 57. Approximate volume of air a healthy man can expire or inspire per minute is: A) 5000 to 6000 ml. B) 7000 to 9000 mL. C) 6000 to 8000 mL. D) 6000 to 7000 mL. Show Answer Correct Answer: C) 6000 to 8000 mL. 58. The barrier between the air in alveolus and blood in pulmonary capillary consists of 3 layers and its total thickness A) More than 1 mm. B) 2 mm. C) 1 mm. D) Much less than 1 mm. Show Answer Correct Answer: D) Much less than 1 mm. 59. Find out correct statement: A) About 97 percent of O2 is transported by RBCs in the blood. B) About 90-93 percent of CO2 is transported by RBCs is the blood. C) About 7 percent of O2 and 3 percent of CO2 is carried in dissolved form through plasma. D) More than one are correct. Show Answer Correct Answer: A) About 97 percent of O2 is transported by RBCs in the blood. 60. AccordingtoCentral Pollution Control Board (CPCB) what size (in diameter) of particulate is responsible for causing greater harmtohumanhealth? A) 2.5 micrometers. B) 4.0 micrometers. C) 3.0 micrometers. D) 3.5 micrometers. Show Answer Correct Answer: A) 2.5 micrometers. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 1Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 2Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 3Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 4Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 5Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 7Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 8Class 11 Biology Chapter 1 The Living World Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books