This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Biology Chapter 17 Breathing And Exchange Of Gases – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does the Larynx hold? A) The larynx holds the whole respitory system. B) The larynx holds the trachea. C) The larynx holds the vocal chords. D) The larynx hold the wind pipe. Show Answer Correct Answer: C) The larynx holds the vocal chords. 2. Trachea divides into primary bronchi at: A) T5. B) T6. C) T4. D) T7. Show Answer Correct Answer: A) T5. 3. 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. 4. Mechanism of breathing vary among different groups of animals and depends mainly on- A) Habitat. B) Levels of organisation. C) Metabolism. D) More than one option is correct. Show Answer Correct Answer: D) More than one option is correct. 5. 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. 6. Which of the following is not true of hemoglobin? A) It contains iron. B) It has a quaternary structure. C) Each heme group can bind with one oxygen atom. D) It forms oxyhemoglobin when it attaches to oxygen. Show Answer Correct Answer: C) Each heme group can bind with one oxygen atom. 7. 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. 8. Primary site for gaseous exchange in humans: A) Nostrils. B) Endothelium. C) Alveoli. D) Deoxygenated blood. Show Answer Correct Answer: C) Alveoli. 9. An increase in lung ventilation rate is caused by which of the following conditions? A) Increase of CO2 content in inhaled air. B) Addition of CO2 content in exhaled air. C) Decrease of O2 content in exhaled air. D) Reduction of O2 content in inhaled air. Show Answer Correct Answer: A) Increase of CO2 content in inhaled air. 10. 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. 11. Which is the correct sequence of air passages in man? A) External nostril $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. B) Nose $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. C) Nose $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. D) Nose $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. Show Answer Correct Answer: A) External nostril $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$ $\rightarrow$. 12. Which of the following is NOT a respiratory organ in amphibians? A) Lungs. B) Gills. C) Moist Skin. D) Trachea. Show Answer Correct Answer: D) Trachea. 13. Which of the following statement is/are true? A) Diffusion capacity of CO2 is 20-25 times higher than that of O2. B) The solubility of CO2 is 20-25 times higher than that of O2. C) The diffusion capacity of O2 is 20-25 times higher than that of CO2. D) More than one statements are correct. Show Answer Correct Answer: D) More than one statements are correct. 14. Ciliated epithelium in trachea of mammals helps in: A) Sucking inspired air in. B) Perceiving sense of smell. C) Pushing expired air out. D) Pushing mucus out. Show Answer Correct Answer: D) Pushing mucus out. 15. The oxy-hemoglobin dissociation curve shifts to the right by all the following except: A) Increased carbon dioxide. B) Increased pH. C) Increased temperature. D) Presence of 2, 3 DPG. Show Answer Correct Answer: B) Increased pH. 16. What protects lungs? A) Ribs. B) Vertebral column. C) Sternum. D) All of the above. Show Answer Correct Answer: D) All of the above. 17. Arrange the following in order of increasing volume ..... 1. Tidal volume 2. residual volume 3. Expiratory reserve volume. 4. Vital capacity A) 1 < 2 < 3 < 4. B) 1 < 4 < 3 < 2. C) 1 < 3 < 2 < 4. D) 1 < 4 < 2 < 3. Show Answer Correct Answer: C) 1 < 3 < 2 < 4. 18. 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. 19. Respiration in insects is called direct because A) The cells exchange O$_{2}$/CO$_{2}$ directly with the air in the tubes. B) The tissues exchange O$_{2}$/CO$_{2}$ directly with coelomic fluid. C) The tissues exchange O$_{2}$/CO$_{2}$ directly with the air outside through body surface. D) Tracheal tubes exchange O$_{2}$/CO$_{2}$ directly with the haemocoel which then exchange with tissues. Show Answer Correct Answer: A) The cells exchange O$_{2}$/CO$_{2}$ directly with the air in the tubes. 20. Contraction of diaphragm ..... ? A) Increase the vol of the thoracic chamber in the anterio posterior axis. B) Increase the vol of the thoracic in the darso ventral axis. C) Decrease the vol of the thoracic chamber in the anterio posterior axis. D) Decrease he vol of the thoracic chamber in the dorso ventral axis. Show Answer Correct Answer: A) Increase the vol of the thoracic chamber in the anterio posterior axis. 21. Which structure is responsible for the sound production in humans? A) Trachea. B) Larynx. C) Bronchi. D) Pharynx. Show Answer Correct Answer: B) Larynx. 22. 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. 23. Whale respire through: A) Lungs. B) Gills. C) Diffusion. D) Skin. Show Answer Correct Answer: A) Lungs. 24. ..... constitute the conducting part. A) External nostrils upto terminal bronchioles. B) External nostrils upto initial bronchioles. C) Nasal cavity upto terminal bronchioles. D) Internal nostrils upto alveolar ducts. Show Answer Correct Answer: A) External nostrils upto terminal bronchioles. 25. Besides RBC blood plasma also carries O2 in solution. The percentage is- A) 3%. B) 97%. C) 49%. D) 25%. 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