This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Biology > Class 11 Biology Chapter 17 Breathing And Exchange Of Gases – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The C-shaped cartilaginous rings around the trachea are open posteriorlyto ..... ? A) Allow for expansion of the esophagus during swallowing. B) Allow the vocal cords to relax. C) Prevent food from entering the nasal cavity during swallowing. D) Prevent food from enterng the trachea. Show Answer Correct Answer: A) Allow for expansion of the esophagus during swallowing. 2. Tidal volume is: A) Volume of air inspired or expired in normal breath. B) Additional volume of air, a person can expire by a forcible expiration. C) Additional volume of air, a person can inspire by a forcible inspiration. D) Remaining volume of air in the lungs even after a forcible expiration. Show Answer Correct Answer: A) Volume of air inspired or expired in normal breath. 3. Read the given statements and select the correct option.Statement 1:Respiration is most efficient in the insects, among the invertebrates.Statement 2:In the insects, air is carried directly to the cells by tracheoles. 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. 4. Complete the following sentence by selecting the correct option.The breathing rhythm is generated in the (i) and is influenced by variation in levels in levels of (ii) in the blood. A) (i) medulla (ii) CO2. B) (i) medulla (ii) O2. C) (i) frontal lobe (ii) CO2 and O2. D) (i) frontal lobe (ii) CO2. Show Answer Correct Answer: A) (i) medulla (ii) CO2. 5. Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present in A) Pons region of brain. B) Right cerebral hemisphere. C) Thalamus. D) Spinal cord. Show Answer Correct Answer: A) Pons region of brain. 6. Surfactant which helps the alveoli from collapsing: A) Phospholipid. B) Lecithin. C) Both a and b. D) Secreted by type 1 pneumocytes. Show Answer Correct Answer: C) Both a and b. 7. If CO2 concentration increases in blood, then respiration A) Decreases. B) Increases. C) Stops. D) No change occurs. Show Answer Correct Answer: B) Increases. 8. Which of the following statements about the partial pressure of CO$_{2}$ is true? A) It is higher in alveoli than in pulmonary artery. B) It is higher in the systemic arteries than in tissues. C) It is higher in the pulmonary veins than in pulmonary arteries. D) It is higher in systemic veins than in systemic arteries. Show Answer Correct Answer: D) It is higher in systemic veins than in systemic arteries. 9. Normal amount of Oxygen and carbon dioxide present in air when inhaled by man, he feels suffocated because ..... A) Hemoglobin units with CO instead of O2 to form carboxyhaemoglobin. B) CO affects nerves of lungs. C) CO and O2 reacts together to decrease their amount. D) CO affects diaphragm and intercostal muscles. Show Answer Correct Answer: A) Hemoglobin units with CO instead of O2 to form carboxyhaemoglobin. 10. Which one of the following is the correct statement for respiration in humans? A) Cigarette smoking may lead to inflammation of bronchi. B) Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration. C) Workers in grinding and stone breaking industries may suffer, from lung fibrosis. D) About 90% of carbon dioxide(CO ) 2 is carried by haemoglobinas carbamino haemoglobin. Show Answer Correct Answer: C) Workers in grinding and stone breaking industries may suffer, from lung fibrosis. 11. What is the primary purpose of surfactant in the lungs? A) To transport oxygen. B) To filter air. C) To reduce surface tension. D) To increase surface tension. Show Answer Correct Answer: C) To reduce surface tension. 12. What is the shape of Haemoglobin-oxygen dissociation curve? A) Straight. B) Sigmoid. C) Hyperbolic. D) Constant. Show Answer Correct Answer: B) Sigmoid. 13. Read the given statements and select the correct option.Statement 1:Rate of breathing is regulated by respiratory centres present in the medulla oblongata.Statement 2:Changes in the CO2 level of the arterial blood control the rate of 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. 14. All of the following can bond with haemoglobin except A) H$^{+}$. B) CO$_{2}$. C) HCO$_{3}$$^{-}$. D) O$_{2}$. Show Answer Correct Answer: C) HCO$_{3}$$^{-}$. 15. Select the favorable conditions required for the formation of oxyhemoglobin at the alveoli. A) LowpO2, lowpCO2, more H+, higher temperature. B) HighpO2, highpCO2, less H+, higher temperature. C) HighpO2, lowpCO2, less H+, lower temperature. D) LowpO2, highpCO2, more H+, higher temperature. Show Answer Correct Answer: C) HighpO2, lowpCO2, less H+, lower temperature. 16. When P50 value in blood rises, the affinity of respiratorypigment to combine with O2 will- A) Remain same. B) Rise. C) Fall. D) First rise and then fall. Show Answer Correct Answer: C) Fall. 17. Dissociation of oxyhaemoglobin in blood increases when there is A) Increase in pH and decrease in CO$_{2}$ concentration. B) Decrease in temperature and increase in O$_{2}$ concentration. C) Increase in CO$_{2}$ concentration. D) Decrease in pH and increase in CO$_{2}$ concentration. Show Answer Correct Answer: D) Decrease in pH and increase in CO$_{2}$ concentration. 18. At rest cardiac output is 5L / min, how much CO$_{2}$ is delivered to the lungs to be exhaled each minute? A) 5 ml / min. B) 1.34 ml / min. C) 4 ml / min. D) 200 ml / min. Show Answer Correct Answer: D) 200 ml / min. 19. It is known that exposure to carbon monoxide is harmful to animals because A) It increases CO$_{2}$ transport. B) It reduces CO$_{2}$ transport. C) It increases O$_{2}$ transport. D) It reduces O$_{2}$ transport. Show Answer Correct Answer: D) It reduces O$_{2}$ transport. 20. Branchial respiration is present in: A) Reptiles. B) Aves. C) Amphibians. D) Fishes. Show Answer Correct Answer: D) Fishes. 21. What is the approximate normal composition of alveolar air? A) 10% oxygen, 8% carbon dioxide, 82% nitrogen. B) 21% oxygen, 2% carbon dioxide, 77% nitrogen. C) 14% oxygen, 6% carbon dioxide, 80% nitrogen. D) 16% oxygen, 3% carbon dioxide, 81% nitrogen. Show Answer Correct Answer: C) 14% oxygen, 6% carbon dioxide, 80% nitrogen. 22. C shaped cartilagenous rings are absent in: A) Initial bronchioles. B) Respiratory bronchioles. C) Terminal bronchioles. D) Both b and c. Show Answer Correct Answer: D) Both b and c. 23. Rate of breathing is controlled by A) Stress. B) Muscular function of the body. C) Amount of carbon dioxide. D) The amount of freely available oxygen. Show Answer Correct Answer: C) Amount of carbon dioxide. 24. Lungs are comprised by- A) Only alveoli. B) Pleura. C) Different types of bronchi. D) Network of bronchi, bronchioles and alveoli. Show Answer Correct Answer: D) Network of bronchi, bronchioles and alveoli. 25. Which one of the following is called inspiratory muscle in mammals? A) Pleural muscle. B) Internal interchondral muscle. C) Radial muscle. D) External intercostal muscle. Show Answer Correct Answer: D) External intercostal muscle. 26. Amphibians e.g. frogs respire- A) A, Through moist skin. B) B. Lungs. C) Both a and b. D) Only b. Show Answer Correct Answer: C) Both a and b. 27. During transport of carbon dioxide why blood does not become acidic? A) Due to neutralization of H2CO3 by Na2CO3. B) Due to absorption of leukocytes. C) Due to presence of blood buffer. D) None of the above. Show Answer Correct Answer: C) Due to presence of blood buffer. 28. The carbon dioxide is transported via blood to lungs as A) Dissolved in blood plasma. B) In the form of carbonic acid only. C) In combination with haemo globin only. D) Carbamino haemoglobin and as carbonic acid. Show Answer Correct Answer: D) Carbamino haemoglobin and as carbonic acid. 29. Contraction and relaxation of diaphragm is sequentially connected with which process? A) Exhalation-Exhalation. B) Inhalation-Inhalation. C) Exhalation-Inhalation. D) Inhalation-Exhalation. Show Answer Correct Answer: D) Inhalation-Exhalation. 30. Gas exchange in animals always involves- A) Anaerobic cellular respiration. B) Diffusion across membranes. C) Active transport of gases. D) None. Show Answer Correct Answer: B) Diffusion across membranes. 31. Primary trachea further showing braching A) 2. B) 4. C) 5. D) 3. Show Answer Correct Answer: C) 5. 32. Lungs are madeup of air filled sacs, the alveoli. they donot collapse even after foreful expiration, because of ..... ? A) ERV. B) RV. C) IRV. D) TV. Show Answer Correct Answer: B) RV. 33. What is the maximum amount of air the lungs can hold called? A) Residual Volume. B) Inspiratory Capacity. C) Total Lung Capacity. D) Vital Capacity. Show Answer Correct Answer: C) Total Lung Capacity. 34. The urge to inhale in humans results from A) Rising pCO2. B) Rising pO2. C) Falling pCO2. D) Falling pO2. Show Answer Correct Answer: A) Rising pCO2. 35. Total volume of air, normaly inhalation and forcefully taken is ..... A) IRV. B) IC. C) ERV. D) RV. Show Answer Correct Answer: B) IC. 36. Fetal haemoglobin has X affinity for oxygen than that of mother's haemoglobin during gastation. X is A) Lower affinity earlier but higher later. B) Higher. C) Lower. D) Same. Show Answer Correct Answer: B) Higher. 37. Asthma is caused by- A) Infections of lungs. B) Infections of trachea. C) Spasm in bronchial muscles. D) Infection in nose. Show Answer Correct Answer: C) Spasm in bronchial muscles. 38. Every 100 ml of oxygenated blood delivers following amount of O$_{2}$ to the tissues under normal physiological condition A) 50 ml. B) 5 ml. C) More the 50 ml. D) 25 ml. Show Answer Correct Answer: B) 5 ml. 39. Which controls the volume of pulmonary cavity: A) Diaphragm. B) Muscles. C) Thoracic cavity. D) Abdominal cavity. Show Answer Correct Answer: C) Thoracic cavity. 40. The partial pressure of oxygen and the partial pressure of carbon dioxide is identical in A) Alveoli and deoxygenated blood. B) Tissues and deoxygenated blood. C) Oxygenated blood and tissues. D) Tissues and oxygenated blood. Show Answer Correct Answer: B) Tissues and deoxygenated blood. 41. In breathing movements, air volume can be estimated by A) Hygrometer. B) Stethoscope. C) Spirometer. D) Sphygmomanometer. Show Answer Correct Answer: C) Spirometer. 42. Which of the following factors is not favourable for the formation of oxyhaemoglobin? A) High pCO2. B) High pO2. C) Less H+ concentration. D) Low temperature. Show Answer Correct Answer: A) High pCO2. 43. A unique feature common to the alveoli of lungs and the villi of the intestine is that both A) Have ciliated columnar epithelium. B) Have a rich supply of blood vessels and lymph ducts. C) Provide a large surface area. D) Are suited for diffusion of gases. Show Answer Correct Answer: C) Provide a large surface area. 44. In humans, which of the following is not a step in respiration? A) Alveolar diffusion of O2 and CO2. B) Transport of gases by blood. C) Diffusion of O2 and CO2 between blood and tissues. D) Utilisation of CO2 by cells for catabolic reactions. Show Answer Correct Answer: D) Utilisation of CO2 by cells for catabolic reactions. 45. Inspiratory Capacity is A) ERV+RV. B) TV+ERV. C) IRV+ERV. D) TV+IRV. Show Answer Correct Answer: D) TV+IRV. 46. When the volume of the thorax increases, ..... A) The pressure in the lungs increases. B) The pressure in the lungs decreases. C) The volume of the thorax decreases. D) There is no change in pressure. Show Answer Correct Answer: B) The pressure in the lungs decreases. 47. The hemoglobin of a human foetus A) Has a higher affinity for oxygen. B) Is only present in the mother's blood. C) Is not capable of carrying oxygen. D) Has a lower affinity for oxygen. Show Answer Correct Answer: A) Has a higher affinity for oxygen. 48. The breathing centre initiates ventilation in response to- A) A decrease in O$_{2}$. B) The rate of gas exchange in the alveoli. C) An increase in CO$_{2}$. D) A decrease in air pressure. Show Answer Correct Answer: C) An increase in CO$_{2}$. 49. Vital capacity and Residual volume of an athlete 4600 ml and 1200 ml respectively. What will be his Total Lung capacity if his Expiratory reserve volume is 1100 ml? A) 5700 ml. B) 4600ml. C) 5800 ml. D) 2300 ml. Show Answer Correct Answer: C) 5800 ml. 50. Which part of the respiratory system is responsible for gas exchange? A) Bronchi. B) Larynx. C) Trachea. D) Alveoli. Show Answer Correct Answer: D) Alveoli. 51. Pressure within lungs is called: A) Alveolar pressure. B) Inter pulmonary pressure. C) Interstitial pressure. D) Intra pulmonary pressure. Show Answer Correct Answer: D) Intra pulmonary pressure. 52. An oxygen dissociation curve will shift to the right in what condition describe below. A) Decreased partial pressure of oxygen. B) Increased partial pressure of carbon dioxide. C) Increased partial pressure of oxygen. D) Decreased partial pressure of carbon dioxide. Show Answer Correct Answer: B) Increased partial pressure of carbon dioxide. 53. Most abundant cartilage of larynx: A) Cricoid cartilage. B) Artenoid cartilage. C) Hyaline cartilage. D) None. Show Answer Correct Answer: C) Hyaline cartilage. 54. When diaphragm is pushed up, process occurs is ..... A) Contraction of diaphragm muscles. B) Relaxation of diaphragm muscles. C) Increases size of thorax cavity. D) Diaphragm is pushed down. Show Answer Correct Answer: B) Relaxation of diaphragm muscles. 55. These are the small units of lungs where the actual exchange of gases takes place. A) Epiglottis. B) Bronchi. C) Alveoli. D) Trachea. Show Answer Correct Answer: C) Alveoli. 56. Alveoli have a good blood supply to maintain the concentration gradients of oxygen and carbon dioxide. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 57. When breathing process is slow? A) Sleeping. B) Exercising. C) Anger. D) Excited condition. Show Answer Correct Answer: A) Sleeping. 58. There are two statements Statement 1:Carbonic anhydrase is present in erythrocytesStatement 2:In erythrocytes, CO2 combines with H2O and is transported A) Statement 1 is correct but statement 2 is wrong. B) Statement 1 is correct is responsible for statement 2. C) Statement 1 is not correct but statement 2 is correct. D) Both the statement are wrong. Show Answer Correct Answer: B) Statement 1 is correct is responsible for statement 2. 59. The patient has been inhaling polluted air containing unusally high content of A) Carbon monooxide. B) Chloroform. C) Carbon disulphide. D) Carbon dioxide. Show Answer Correct Answer: A) Carbon monooxide. 60. Mammalian lungs have an enormous number of minute alveoli (air sacs). This is toallow A) More nerve supply to keep the lungs working. B) More spongy texture for keeping lung in proper shape. C) More surface area for diffusion of gases. D) More space for increasing the volume of inspired air. Show Answer Correct Answer: C) More surface area for diffusion of gases. ← 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 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