This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Biology > Class 11 Biology Chapter 17 Breathing And Exchange Of Gases – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the main bone structure that protects the lungs A) Pelvis. B) Rib cage. C) Skull. D) Vertebrae. Show Answer Correct Answer: B) Rib cage. 2. Which gas is primarily responsible for the feeling of breathlessness at high altitudes? A) Oxygen. B) Hydrogen. C) Nitrogen. D) Carbon dioxide. Show Answer Correct Answer: A) Oxygen. 3. Which of the following structures close the glottis during swallowing to preventthe entry of food into windpipe? A) Larynx. B) Tongue. C) Epiglottis. D) Diaphragm. Show Answer Correct Answer: C) Epiglottis. 4. All of the following factors play role in the regulation of respiratory rhythm except- A) CO$_{2}$. B) H$^{+}$ conc. C) O$_{2}$. D) None of the above is correct. Show Answer Correct Answer: C) O$_{2}$. 5. The cells which do not respire A) Epidermal cells. B) Cortical cells. C) Erythrocytes. D) Sieve cells. Show Answer Correct Answer: C) Erythrocytes. 6. Respiratory centre of medulla oblongata sends message to ..... A) Diaphragm muscle. B) Intercostal muscle. C) Pulmonary muscle. D) A and b both. Show Answer Correct Answer: D) A and b both. 7. Every 100 ml deoxygenated blood delivers around ..... carbon dioxide to alveoli. A) Around 10 ml. B) 4 ml. C) Around 60 ml. D) Around 80 ml. Show Answer Correct Answer: B) 4 ml. 8. Which of the following is entirely made up of cartilage? A) Trachea. B) Glottis. C) Larynx. D) Nasal septum. Show Answer Correct Answer: C) Larynx. 9. Read the given statements and select the correct option.Statement 1:Mammals can eat while breathing.Statement 2:Mammals have negative pressure breathing. A) Both statements 1 and 2 are correct. B) Statement 1 is correct but statement 2 is incorrect. C) Statement 1 is incorrect but statement 2 is correct. D) Both statements 1 and 2 are incorrect. Show Answer Correct Answer: A) Both statements 1 and 2 are correct. 10. A disease characterised by accumulation of fluid with dead WBCs occupying most of the air space in alveolar sac is A) Bronchial asthma. B) Bronchitis. C) Pneumonia. D) Emphysema. Show Answer Correct Answer: C) Pneumonia. 11. Which respiratory disorder is characterized by wheezing due to inflammation? A) Asbestosis. B) Asthma. C) Silicosis. D) Emphysema. Show Answer Correct Answer: B) Asthma. 12. Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls A) Pleurisy. B) Pneumonia. C) Asthma. D) Emphysema. Show Answer Correct Answer: D) Emphysema. 13. Nearly 20-25 per cent of CO$_{2}$ is transported by RBCs whereas 70 per cent of it is carried as bicarbonate. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 14. Which of following does not occur during breathing? A) Brings the air to body temperature. B) Cleans up the air. C) Diffusion of gases. D) Warms up the air. Show Answer Correct Answer: C) Diffusion of gases. 15. Trachea is a straight tube which extends up to A) 4TH THORACIC VERTEBRA. B) 5TH THORACIC VERTEBRA. C) MID THORACIC VERTEBRA. D) BOTH B & C. Show Answer Correct Answer: D) BOTH B & C. 16. Primary, secondary, tertiary bronchi and initial bronchioles are supported by: A) Incomplete chitinous rings. B) Complete cartilaginous rings. C) Incomplete cartilaginous rings. D) Complete chitinous rings. Show Answer Correct Answer: C) Incomplete cartilaginous rings. 17. Why is the left lung slightly smaller than the right lung? A) To give space for the liver. B) To give space for the heart. C) Becuase it is shaped like that. D) To breathe easily. Show Answer Correct Answer: B) To give space for the heart. 18. The partial pressure of CO$_{2}$ in the venous blood is- A) Lesser than in the arterial blood. B) Lesser than in the tissue spaces. C) Less than in alveoli. D) Greater than in the tissue spaces. Show Answer Correct Answer: B) Lesser than in the tissue spaces. 19. Which primary trachea is horizontal? A) Right. B) Left. C) Both. D) Same. Show Answer Correct Answer: A) Right. 20. When CO2 concentration in blood increases, breathing becomes A) Shallower and slow. B) Faster and deeper. C) Slow and deep. D) There is no effect on breathing. Show Answer Correct Answer: B) Faster and deeper. 21. Glottis opens on the floor of A) Pharyngeal cavity. B) Diaphragm. C) Trachea. D) None of the above. Show Answer Correct Answer: A) Pharyngeal cavity. 22. Vital capacity of lungs is ..... A) 3.5-4.5 l. B) 1.5-2.5 l. C) 2.5-3.9 l. D) 4.5-5.5 l. Show Answer Correct Answer: A) 3.5-4.5 l. 23. Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature? ..... (a) They do not need to reproduce(b) They are somatic cells(c) They do not metabolize(d) All their internal space is available for oxygen transport A) Only (d). B) Only (a). C) A), (c) and (d). D) (b) and (c. Show Answer Correct Answer: A) Only (d). 24. Which part of the brain regulates the respiratory rhythm? A) Pons. B) Medulla Oblongata. C) Cerebrum. D) Cerebellum. Show Answer Correct Answer: B) Medulla Oblongata. 25. Air is breathed through- A) Nose-larynx-pharynx-bronchus-alveoli-bronchioles. B) Trachea-lungs-larynx-pharynx-alveoli. C) Nostrils-pharynx-larynx-trachea-bronchi-bronchioles-alveoli. D) Nose-mouth-lungs. Show Answer Correct Answer: C) Nostrils-pharynx-larynx-trachea-bronchi-bronchioles-alveoli. 26. The ion found in the haem group is what A) Mg$^{2+}$. B) Fe$^{3+}$. C) Fe$^{2+}$. D) O$^{2-}$. Show Answer Correct Answer: C) Fe$^{2+}$. 27. Treachea divides into two right and left primary bronchi at the level of ..... ? A) 5th thoracic vertebrae. B) 7th thoracic vertebrae. C) 7th cervial vartebrae. D) 3rd thoracic vertebrae. Show Answer Correct Answer: A) 5th thoracic vertebrae. 28. Total volume of air accommodated in the lungs at the end of a forced inspiration is called A) IRV. B) VC. C) TLC. D) RV. Show Answer Correct Answer: C) TLC. 29. Part of pharynx which open in the nasal cavity: A) Internal nares. B) Nasopharynx. C) Oropharynx. D) None. Show Answer Correct Answer: B) Nasopharynx. 30. A person suffers punctures in his chest cavity in an accident, without any damage to the lungs its effect could be: A) Cessation of breathing. B) Reduced breathing rate. C) No change in respiration. D) Rapid increase in breathing rate. Show Answer Correct Answer: A) Cessation of breathing. 31. Structures in cockroach that are similar to nostrils of human? A) Tracheole. B) Trachea. C) Spiracles. D) Lungs. Show Answer Correct Answer: C) Spiracles. 32. What is the role of the nasal cavity in the respiratory system? A) To regulate blood flow. B) To facilitate gas exchange. C) To filter and humidify air. D) To produce mucus. Show Answer Correct Answer: C) To filter and humidify air. 33. The trachea is lined with ..... ? A) Ciliated simple sqamous epithelium. B) Stratified squamous epithelium. C) Pseudostratified ciliated columnar epithelium. D) Pseudostratified squamous epithelium. Show Answer Correct Answer: C) Pseudostratified ciliated columnar epithelium. 34. Air enters the lungs. A) Inhalation. B) Exhalation. C) All the above. D) None of the above. Show Answer Correct Answer: A) Inhalation. 35. Which of the following is true of a normal adult hemoglobin oxygen dissociation curve?I. it is sigmoidalII. it is easier for the last O$_{2}$ to bind than the second and third III. at lower partial pressures of oxygen, hemoglobin has a lower affinity for oxygen A) I and II only. B) I and III only. C) II and III only. D) I, II and III. Show Answer Correct Answer: B) I and III only. 36. Bulk of carbon dioxide is transported by ..... A) Bicarbonate ion (HCO3-). B) Nitrogen. C) Water vapor. D) Oxygen. Show Answer Correct Answer: A) Bicarbonate ion (HCO3-). 37. What is true about RBCs in humans? A) They transport about 80% oxygen only and the rest 20% of it is transported in the dissolved state in blood plasma. B) They transport 99.5% of O$_{2}$. C) They carry about 20-25% of CO$_{2}$. D) They do not carry CO$_{2 }$at all. Show Answer Correct Answer: C) They carry about 20-25% of CO$_{2}$. 38. Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place? A) Diaphragm relaxes and moves upward, intercostal muscles relax and move inward. B) Diaphragm contracts and moves upward, intercostal muscles relax and move inward. C) Diaphragm relaxes and moves downward, intercostal muscles relax and move outward. D) Diaphragm contracts and moves downward, intercostal muscles contract and move outward. Show Answer Correct Answer: A) Diaphragm relaxes and moves upward, intercostal muscles relax and move inward. 39. Alveoli have very thick walls to maximise the distance that gases have to move. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 40. In which of the following gaseous exchange between O$_{2}$ and CO$_{2}$ occurs through general body surface? A) Sponges. B) Coelenterates. C) Flatworms. D) All. Show Answer Correct Answer: D) All. 41. What are the main muscles of inhalation? A) The diaphragm and intercostal muscles. B) The external and internal intercostals. C) The diaphram and abdominal muscles. D) The diaphragm and internal intercostals. Show Answer Correct Answer: A) The diaphragm and intercostal muscles. 42. What is the favorable condition for the formation of oxyhaemoglobin in the alveoli? A) High oxygen concentration. B) Low carbon dioxide concentration. C) Thin walls for easy diffusion. D) Presence of haemoglobin in red blood cells. Show Answer Correct Answer: B) Low carbon dioxide concentration. 43. I. On an average a healthy human breathes12-16 times/minute. II. The volume of air involved in the breathing movements can be estimated by spirometer. III. Diaphragm is very useful in both inspiration and expiration Which of the above statements are incorrect? Choose the correct option. A) I and II. B) II and III. C) I and III. D) None of these. Show Answer Correct Answer: D) None of these. 44. Whichofthefollowingisan occupational respiratory disorder? (a) (b) (c) Ans. (b) (d) A) Silicosis. B) Anthracis. C) Emphysema. D) Botulism. Show Answer Correct Answer: A) Silicosis. 45. Select the correct option A) Nasal cavity, pharynx, larynx, bronchus, trachea. B) Nasal cavity, larynx, pharynx, bronchus, trachea,. C) Nasal cavity, larynx, pharynx, trachea, bronchus. D) Nasal cavity, pharynx, larynx, trachea, bronchus,. Show Answer Correct Answer: D) Nasal cavity, pharynx, larynx, trachea, bronchus,. 46. Respiration involves following steps:A. Diffusion of gases O2 and CO2 across alveolar membrane. B. Transport of gases by blood. C. Utilization of O2 by cell for catabolic reaction and resultant release of O2. D. Pulmonary ventilation by which atmospheric air is drawn in and CO2 rich air is released out. E. Diffusion of O2 and CO2 between blood and tissue. A) DABCE. B) DABEC. C) BADCE. D) DBAEC. Show Answer Correct Answer: B) DABEC. 47. Incidence of emphysema-a respiratory disorder is high in cigarette smokers. In such cases A) The bronchioles are found damaged. B) The alveolar walls are found damaged. C) The plasma membrane is found damaged. D) The respiratory muscles are found damaged. Show Answer Correct Answer: B) The alveolar walls are found damaged. 48. After air moves through the pharynx it continues downward. The ..... , or windpipe, directs the air into 2 separate branches or tubes. A) Bronchus. B) Larynx. C) Bronchiole. D) Trachea. Show Answer Correct Answer: D) Trachea. 49. Trachea divides at A) 5th thoracic vertebra into right and left secondarybronchi. B) 7th thoracic vertebra into secondary bronchi. C) 5th thoracic vertebra into right and left primarybronchi. D) 7th thoracic vertebra into primary bronchi. Show Answer Correct Answer: C) 5th thoracic vertebra into right and left primarybronchi. 50. Bulk of carbon dioxide released from body tissues into blood is present as: A) Free carbon dioxide in blood plasma. B) Carbaminohaemoglobin in RBC. C) Bicarbonate in blood plasma and RBC. D) 70% carbaminohaemoglobin and 30% as bicarbonate. Show Answer Correct Answer: C) Bicarbonate in blood plasma and RBC. 51. Which of the following reactions occur in erythrocytes in the pulmonary capillaries? A) HbO$_{2}$ $\rightarrow$ Hb + O$_{2}$. B) Hb + CO$_{2}$ $\rightarrow$ HbCO$_{2 }$. C) H$_{2}$CO$_{3 }$$\rightarrow$ H+ + HCO$_{3}$ $^{-}$. D) Hb + O$_{2}$ $\rightarrow$ HbO$_{2}$. Show Answer Correct Answer: D) Hb + O$_{2}$ $\rightarrow$ HbO$_{2}$. 52. Regarding the functions of our respiratory system mark the wrong entry A) Humidifies air. B) Cleans up the air. C) Diffusion of gases. D) Warms up the air. Show Answer Correct Answer: C) Diffusion of gases. 53. A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is: A) Vital capacity. B) Total lung capacity. C) Tidal volume. D) Inspiratory capacity. Show Answer Correct Answer: A) Vital capacity. 54. Name the chronic respiratory disorder caused mainly by cigarette smoking. A) Emphysema. B) Asthma. C) Respiratory acidosis. D) Respiratory alkalosis. Show Answer Correct Answer: A) Emphysema. 55. A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle . This is called A) Inspiratory reserve volume. B) Vital capacity. C) Expiratory reserve volume. D) Tidal volume. Show Answer Correct Answer: D) Tidal volume. 56. The partial pressure of oxygen in the alveoli of the lungs is A) Less than that of carbon dioxide. B) More than that in the blood. C) Equal to that in the blood. D) Less than that in the blood. Show Answer Correct Answer: B) More than that in the blood. 57. Reduction in PH of blood wil ..... ? A) Release bicarbonate ions by the liver. B) Reduce the blood supply to the brain. C) Reduce the rate of heart beat. D) Decrease the affinity of hemoglobin with oxygen. Show Answer Correct Answer: D) Decrease the affinity of hemoglobin with oxygen. 58. Binding of O$_{2}$ with haemoglobin is primarily related to- A) PO$_{2}$. B) PCO2. C) H$^{+}$ conc. D) None. Show Answer Correct Answer: A) PO$_{2}$. 59. Which one of the followings is correct regarding larynx?(a) It prevents foreign objects from entering the trachea(b) It houses the vocal cords(c) It is an organ made of cartilage and connects the pharynx to the trachea(d) All of these are correct A) A) It prevents foreign objects from entering the trachea. B) B) It houses the vocal cords. C) C) It is an organ made of cartilage and connects the pharynx to the trachea. D) (d) All of these are correct. Show Answer Correct Answer: D) (d) All of these are correct. 60. A center that moderates the functions of the respiratory rhythm center is located in ..... ? A) Dorsal medulla oblongata. B) Pons varolli. C) Ventral medulla oblongata. D) Pre central gyrus of the cerebrum. Show Answer Correct Answer: B) Pons varolli. Next →Related QuizzesScience QuizzesClass 11 QuizzesClass 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 6Class 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