This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Biology Chapter 17 Breathing And Exchange Of Gases – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. Which of the following reactions occur in erythrocytes in the pulmonary capillaries? A) Hb + CO$_{2}$ $\rightarrow$ HbCO$_{2 }$. B) H$_{2}$CO$_{3 }$$\rightarrow$ H+ + HCO$_{3}$ $^{-}$. C) Hb + O$_{2}$ $\rightarrow$ HbO$_{2}$. D) HbO$_{2}$ $\rightarrow$ Hb + O$_{2}$. Show Answer Correct Answer: C) Hb + O$_{2}$ $\rightarrow$ HbO$_{2}$. 3. Regarding the functions of our respiratory system mark the wrong entry A) Humidifies air. B) Warms up the air. C) Diffusion of gases. D) Cleans up the air. Show Answer Correct Answer: C) Diffusion of gases. 4. A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is: A) Total lung capacity. B) Tidal volume. C) Vital capacity. D) Inspiratory capacity. Show Answer Correct Answer: C) Vital capacity. 5. Name the chronic respiratory disorder caused mainly by cigarette smoking. A) Asthma. B) Respiratory acidosis. C) Respiratory alkalosis. D) Emphysema. Show Answer Correct Answer: D) Emphysema. 6. 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) Tidal volume. C) Expiratory reserve volume. D) Vital capacity. Show Answer Correct Answer: B) Tidal volume. 7. The partial pressure of oxygen in the alveoli of the lungs is A) Less than that in the blood. B) Less than that of carbon dioxide. C) Equal to that in the blood. D) More than that in the blood. Show Answer Correct Answer: D) More than that in the blood. 8. Reduction in PH of blood wil ..... ? A) Reduce the blood supply to the brain. B) Decrease the affinity of hemoglobin with oxygen. C) Release bicarbonate ions by the liver. D) Reduce the rate of heart beat. Show Answer Correct Answer: B) Decrease the affinity of hemoglobin with oxygen. 9. 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}$. 10. 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. 11. A center that moderates the functions of the respiratory rhythm center is located in ..... ? A) Dorsal medulla oblongata. B) Ventral medulla oblongata. C) Pons varolli. D) Pre central gyrus of the cerebrum. Show Answer Correct Answer: C) Pons varolli. 12. 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. 13. Tidal volume is: A) Volume of air inspired or expired in normal breath. B) Additional volume of air, a person can inspire by a forcible inspiration. C) Additional volume of air, a person can expire by a forcible expiration. 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. 14. 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. 15. 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. 16. Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present in A) Pons region of brain. B) Thalamus. C) Spinal cord. D) Right cerebral hemisphere. Show Answer Correct Answer: A) Pons region of brain. 17. 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. 18. If CO2 concentration increases in blood, then respiration A) Increases. B) Decreases. C) Stops. D) No change occurs. Show Answer Correct Answer: A) Increases. 19. 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 systemic veins than in systemic arteries. D) It is higher in the pulmonary veins than in pulmonary arteries. Show Answer Correct Answer: C) It is higher in systemic veins than in systemic arteries. 20. 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. 21. 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. 22. What is the primary purpose of surfactant in the lungs? A) To filter air. B) To transport oxygen. C) To reduce surface tension. D) To increase surface tension. Show Answer Correct Answer: C) To reduce surface tension. 23. What is the shape of Haemoglobin-oxygen dissociation curve? A) Straight. B) Constant. C) Hyperbolic. D) Sigmoid. Show Answer Correct Answer: D) Sigmoid. 24. 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. 25. All of the following can bond with haemoglobin except A) O$_{2}$. B) H$^{+}$. C) CO$_{2}$. D) HCO$_{3}$$^{-}$. Show Answer Correct Answer: D) HCO$_{3}$$^{-}$. ← PreviousNext →Related 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 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 17 Breathing And Exchange Of Gases Quiz 9Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 10Class 11 Biology Chapter 17 Breathing And Exchange Of Gases Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books