This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Biology > Class 11 Biology Chapter 17 Breathing And Exchange Of Gases – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Pnuemotaxic centre which can moderate the functions of the respiratory rhythm center is present at ..... ? A) Spinal cord. B) Pons region of brain. C) Thalamus. D) Right cerebral hemisphere. Show Answer Correct Answer: B) Pons region of brain. 2. When analysis of patient's blood shows high amount of carboxyhemoglobin, then which of the following summary may mostly correct? Patient may be breathing more amount of polluted air with amount of ..... A) Chloroform. B) Carbon dioxide. C) Carbon monoxide. D) Carbon disulfide. Show Answer Correct Answer: C) Carbon monoxide. 3. The maximum volume of air that can be released from the lungs by forceful expiration after deepest inspiration is called the ..... (a) Total lung capacity(b) Vital capacity(c) Tidal volume(d) Ventilation rate A) Tidal volume. B) Total lung capacity. C) Ventilation rate. D) Vital capacity. Show Answer Correct Answer: D) Vital capacity. 4. Which of the following is entirely made of cartilage ..... ? A) Glottis. B) Nasal septum. C) Trachea. D) Larynx. Show Answer Correct Answer: D) Larynx. 5. What does the Larynx hold? A) The larynx holds the whole respitory system. B) The larynx holds the vocal chords. C) The larynx hold the wind pipe. D) The larynx holds the trachea. Show Answer Correct Answer: B) The larynx holds the vocal chords. 6. Trachea divides into primary bronchi at: A) T6. B) T4. C) T5. D) T7. Show Answer Correct Answer: C) T5. 7. Role of blood in respiration in human A) Connects exchange of gases at pulmonary and cellular level. B) Connects exchange of gases at atmospheric and pulmonary level. C) Connects exchange of gases at atmospheric and cellular level. D) All of the above. Show Answer Correct Answer: A) Connects exchange of gases at pulmonary and cellular level. 8. Mechanism of breathing vary among different groups of animals and depends mainly on- A) Levels of organisation. B) More than one option is correct. C) Habitat. D) Metabolism. Show Answer Correct Answer: B) More than one option is correct. 9. Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. What of the following conclusions is most likely to be correct? A) Carbon disulphide. B) Chloroform. C) Carbon monoxide. D) None of these. Show Answer Correct Answer: C) Carbon monoxide. 10. Which of the following is not true of hemoglobin? A) Each heme group can bind with one oxygen atom. B) It has a quaternary structure. C) It forms oxyhemoglobin when it attaches to oxygen. D) It contains iron. Show Answer Correct Answer: A) Each heme group can bind with one oxygen atom. 11. Which of the following factors affect the diffusion of gases? A) Partial pressure of diffusing gases. B) Solubility of gases. C) The thickness of diffusion membrane. D) All. Show Answer Correct Answer: D) All. 12. Primary site for gaseous exchange in humans: A) Endothelium. B) Alveoli. C) Deoxygenated blood. D) Nostrils. Show Answer Correct Answer: B) Alveoli. 13. An increase in lung ventilation rate is caused by which of the following conditions? A) Addition of CO2 content in exhaled air. B) Reduction of O2 content in inhaled air. C) Decrease of O2 content in exhaled air. D) Increase of CO2 content in inhaled air. Show Answer Correct Answer: D) Increase of CO2 content in inhaled air. 14. An increase in CO2 in human blood shifts the oxyhaemoglobin dissociation curve to the right. What is the explanation for the effect? A) An increase in CO2 concentration increases the ventilation rate. B) CO2 is more soluble than oxygen and displaces it. C) Diffusion of CO2 between the alveoli and the blood is more rapid. D) Increasing the H+ concentration decreases haemoglobin affinity for oxygen. Show Answer Correct Answer: D) Increasing the H+ concentration decreases haemoglobin affinity for oxygen. 15. Which is the correct sequence of air passages in man? A) Nose $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. B) External nostril $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. C) Nose $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. D) Nose $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. Show Answer Correct Answer: B) External nostril $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. 16. Which of the following is NOT a respiratory organ in amphibians? A) Gills. B) Lungs. C) Trachea. D) Moist Skin. Show Answer Correct Answer: C) Trachea. 17. Which of the following statement is/are true? A) More than one statements are correct. B) The diffusion capacity of O2 is 20-25 times higher than that of CO2. C) Diffusion capacity of CO2 is 20-25 times higher than that of O2. D) The solubility of CO2 is 20-25 times higher than that of O2. Show Answer Correct Answer: A) More than one statements are correct. 18. Ciliated epithelium in trachea of mammals helps in: A) Pushing expired air out. B) Perceiving sense of smell. C) Pushing mucus out. D) Sucking inspired air in. Show Answer Correct Answer: C) Pushing mucus out. 19. The oxy-hemoglobin dissociation curve shifts to the right by all the following except: A) Presence of 2, 3 DPG. B) Increased pH. C) Increased carbon dioxide. D) Increased temperature. Show Answer Correct Answer: B) Increased pH. 20. What protects lungs? A) Ribs. B) Vertebral column. C) Sternum. D) All of the above. Show Answer Correct Answer: D) All of the above. 21. Arrange the following in order of increasing volume ..... 1. Tidal volume 2. residual volume 3. Expiratory reserve volume. 4. Vital capacity A) 1 < 4 < 2 < 3. B) 1 < 2 < 3 < 4. C) 1 < 3 < 2 < 4. D) 1 < 4 < 3 < 2. Show Answer Correct Answer: C) 1 < 3 < 2 < 4. 22. If alveolar ventilation is 4200 mL/min, respiratory frequency is 12 breaths per minute, and tidal volume is 500 mL, what is the anatomical-dead-space ventilation? A) 1800 mL/min. B) 6000 mL/min. C) 350 mL/min. D) 1200 mL/min. Show Answer Correct Answer: A) 1800 mL/min. 23. Respiration in insects is called direct because A) The tissues exchange O$_{2}$/CO$_{2}$ directly with coelomic fluid. B) The tissues exchange O$_{2}$/CO$_{2}$ directly with the air outside through body surface. C) Tracheal tubes exchange O$_{2}$/CO$_{2}$ directly with the haemocoel which then exchange with tissues. D) The cells exchange O$_{2}$/CO$_{2}$ directly with the air in the tubes. Show Answer Correct Answer: D) The cells exchange O$_{2}$/CO$_{2}$ directly with the air in the tubes. 24. Contraction of diaphragm ..... ? A) Decrease the vol of the thoracic chamber in the anterio posterior axis. B) Decrease he vol of the thoracic chamber in the dorso ventral axis. C) Increase the vol of the thoracic chamber in the anterio posterior axis. D) Increase the vol of the thoracic in the darso ventral axis. Show Answer Correct Answer: C) Increase the vol of the thoracic chamber in the anterio posterior axis. 25. Which structure is responsible for the sound production in humans? A) Larynx. B) Pharynx. C) Trachea. D) Bronchi. Show Answer Correct Answer: A) Larynx. 26. Carbon monoxide can kill a person because of it's extremely high affinity for A) Haemoglobin. B) Phytochrome. C) Cytochrome. D) None of these. Show Answer Correct Answer: A) Haemoglobin. 27. Whale respire through: A) Skin. B) Gills. C) Lungs. D) Diffusion. Show Answer Correct Answer: C) Lungs. 28. ..... constitute the conducting part. A) External nostrils upto initial bronchioles. B) External nostrils upto terminal bronchioles. C) Nasal cavity upto terminal bronchioles. D) Internal nostrils upto alveolar ducts. Show Answer Correct Answer: B) External nostrils upto terminal bronchioles. 29. Incomplete cartilaginous rings support all of the following except- A) Trachea. B) Primary, secondary and tertiary bronchi. C) Respiratory bronchioles. D) Initial bronchioles. Show Answer Correct Answer: C) Respiratory bronchioles. 30. High percentage of CO2 and very low percentage of O2 may make a person unconscious due to ..... A) Eupnoea. B) Suffocation. C) Emphysema. D) Asphyxia. Show Answer Correct Answer: D) Asphyxia. 31. The rib cage expands. A) Inhalation. B) Exhalation. C) All the above. D) None of the above. Show Answer Correct Answer: A) Inhalation. 32. Chemosensitive area of respiratory centre in medulla is affected by A) Less CO2 and H+ ions. B) Less O2 and H+ions. C) Excess CO2 and H+ions. D) Excess O2 and H+ ions. Show Answer Correct Answer: C) Excess CO2 and H+ions. 33. Amphibia respire by A) Skin and book gills. B) Lungs and skin. C) Lungs and tracheal system. D) Lungs and flame cell. Show Answer Correct Answer: B) Lungs and skin. 34. Exchange of O2 and CO2 between blood and tissue cells occurs by ..... A) Lymph. B) Cerebrospinal fluid. C) Intercellular fluid. D) Coelomic fluid. Show Answer Correct Answer: C) Intercellular fluid. 35. A contraction of the diaphragm during inhalation causes it to flatten. What else does the contraction result in? A) A decrease in lung volume. B) Increase in alveolar pressure. C) A decrease in the volume of the thoracic cavity. D) An increase in the volume of the thoracic cavity. Show Answer Correct Answer: D) An increase in the volume of the thoracic cavity. 36. Skin is an accessory organ of respiration in ..... A) Lizard. B) Frog. C) Humans. D) Rabbit. Show Answer Correct Answer: B) Frog. 37. Although much CO2 is carried in blood yet blood does not become acidic, because A) CO2 absorbed by the leucocytes. B) Oxygen combines with haemoglobin to form oxyhaemoglobin. C) CO2 transport and blood buffers play an important role in it. D) It is continuously diffused through the tissues and is not allowed to accumulate. Show Answer Correct Answer: C) CO2 transport and blood buffers play an important role in it. 38. The blue baby syndrome results from A) Excess of chloride. B) Methaemoglobin. C) Excess of TDS. D) Excess of dissolved oxygen. Show Answer Correct Answer: B) Methaemoglobin. 39. The linings that separate air contained in lungs from venous blood A) Squamous epithelium and tunica media. B) Squamous epithelium and endothelium. C) Transitional epithelium and tunica externa. D) None of the above. Show Answer Correct Answer: B) Squamous epithelium and endothelium. 40. A chamber behind the nose and mouth that leads to the trachea A) Trachea. B) Epiglottis. C) Larynx. D) Pharynx. Show Answer Correct Answer: D) Pharynx. 41. Alveolar epidermis of lung is formed of ..... A) Ciliated columnar. B) Non ciliated squamous. C) Ciliated squamous. D) Non ciliated columnar. Show Answer Correct Answer: B) Non ciliated squamous. 42. In brain, respiratory control centre lies in(a) pons(b) medulla oblongata(c) hypothalamus(d) cerebrum A) A) pons. B) C) hypothalamus. C) B) medulla oblongata. D) (d) cerebrum. Show Answer Correct Answer: C) B) medulla oblongata. 43. The function of pneumotaxic centre is(a) regulate inspiration(b) regulate rhythm(c) increase heart rate(d) all of the above A) (a) regulate inspiration. B) (b) regulate rhythm. C) (c) increase heart rate. D) D) all of the above. Show Answer Correct Answer: A) (a) regulate inspiration. 44. Which of the following represents a larger volume of air than is normally found in the resting tidal volume of a human lung? A) Residual volume. B) Inspiratory reserve volume. C) Expiratory reserve volume. D) All. Show Answer Correct Answer: D) All. 45. Site of gaseous exchange in tadpole larva is A) Buccapharyngeal cavity. B) Lungs. C) Skin. D) Gills. Show Answer Correct Answer: D) Gills. 46. Which of the following is true about the haemoglobin of a human foetus? A) It has a higher affinity for oxygen than that of an adult. B) It has only 2 protein subunits instead of 4. C) Its affinity for oxygen is the same as that of an adult. D) It has a lower affinity for oxygen than that of the adult. Show Answer Correct Answer: A) It has a higher affinity for oxygen than that of an adult. 47. Book lungs are respiratory organs of- A) Scorpion. B) Pila. C) Spider. D) Both A and C. Show Answer Correct Answer: D) Both A and C. 48. In expiration, diaphragm becomes ..... A) Straightened. B) Relaxed. C) Arched/ Dome-shaped. D) Flattened. Show Answer Correct Answer: B) Relaxed. 49. The enzyme that increases the reaction rate between CO2 and H2O in red blood cells is A) Alkaline phosphatase. B) Carbonic synthetase. C) Adenylate cyclase. D) Carbonic anhydrase. Show Answer Correct Answer: D) Carbonic anhydrase. 50. Complete the following sentence by selecting the correct option.Receptors associated with aortic arch and carotid artery can recognise changes in (i) and (ii) concentration and send necessary signals to (iii) for remedial actions. A) (i) CO 2 (ii) H + (iii) rhythm centre. B) (i) CO 2 (ii) H + (iii) apneustic centre. C) (i) O2 (ii) H + (iii) pneumotaxic centre. D) (i) O2 (ii) CO2 (iii) pneumotaxic centre. Show Answer Correct Answer: A) (i) CO 2 (ii) H + (iii) rhythm centre. 51. Which is false? ..... a) Blood from right side of heart is carried to lungs by pulmonary arteryb) Pleura is double covering of kidney c) Pancreas is both exocrine and endocrine glandd) Scurvy is due to vitamin C deficiency A) Blood from right side of heart is carried to lungs by pulmonary artery. B) Pleura is double covering of kidney. C) Pancreas is both exocrine and endocrine gland. D) Scurvy is due to vitamin C deficiency. Show Answer Correct Answer: B) Pleura is double covering of kidney. 52. The small tree-like branches coming of the bronchi are the ..... A) Branches. B) Bronchioles. C) Pharynx. D) Trachea. Show Answer Correct Answer: B) Bronchioles. 53. What is the primary function of the epiglottis? A) To produce sound. B) To exchange gases. C) To filter air. D) To prevent food from entering the trachea. Show Answer Correct Answer: D) To prevent food from entering the trachea. 54. Statement I-Lungs are covered by double layered pleuraStatement II-Pleural fluid increases the friction on the lungs surface. A) Statement I is true but II is not true. B) Statement II is true but I is not true. C) Both are true. D) Both are false. Show Answer Correct Answer: A) Statement I is true but II is not true. 55. Cut of centre of Pons work for A) 1 sec. B) 2 sec. C) 4 sec. D) 3 sec. Show Answer Correct Answer: D) 3 sec. 56. The tubes that go from the trachea into the lungs A) Diaphragm. B) Bronchial tubes. C) Alveoli. D) Epiglottis. Show Answer Correct Answer: B) Bronchial tubes. 57. ***** I ..... It is double layered and covers the lungs ***** II ..... Fluid between the layers reduces friction on lung-surface ***** III ..... Outer layer is in contact with thoracic wall***** IV ..... Inner layer is in contact with lungs The above features refer to- A) Pericardium. B) Peritoneum. C) Pleura. D) None. Show Answer Correct Answer: C) Pleura. 58. Following are few characters of a disorder in human body.(i) Inflammation of the mucous membrane of nasal passage.(ii) Watery secretions by mucous glands.(iii) Continuous sneezing(iv) Eye watering(v) Rise in body temperatureIdentify the disorder from the choices given below A) Rhinitis. B) Diphtheria. C) Bronchial carcinoma. D) Emphysema. Show Answer Correct Answer: A) Rhinitis. 59. Mechanical movement to inhale and exhale air A) Breathing. B) Gas Exchange. C) Respiration. D) Transport. Show Answer Correct Answer: A) Breathing. 60. Statement I-Conducting part starts from external nostrils to terminal bronchioles.Statement II-Respiratory part starts from larynx to alveoli. A) Both Statement are true. B) Both statement are false. C) Statement I is true but II is false. D) Statement I is false but I is true. Show Answer Correct Answer: C) Statement I is true but II is false. ← 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 6Class 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