This quiz works best with JavaScript enabled. Home > Class 11 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the main bone structure that protects the lungs A) Vertebrae. B) Rib cage. C) Skull. D) Pelvis. Show Answer Correct Answer: B) Rib cage. 2. Which gas is primarily responsible for the feeling of breathlessness at high altitudes? A) Carbon dioxide. B) Nitrogen. C) Oxygen. D) Hydrogen. Show Answer Correct Answer: C) Oxygen. 3. Which of the following structures close the glottis during swallowing to preventthe entry of food into windpipe? A) Tongue. B) Epiglottis. C) Diaphragm. D) Larynx. Show Answer Correct Answer: B) 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) Sieve cells. C) Cortical cells. D) Erythrocytes. Show Answer Correct Answer: D) 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) 4 ml. B) Around 80 ml. C) Around 60 ml. D) Around 10 ml. Show Answer Correct Answer: A) 4 ml. 8. Which of the following is entirely made up of cartilage? A) Nasal septum. B) Larynx. C) Glottis. D) Trachea. Show Answer Correct Answer: B) 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) Pneumonia. B) Bronchitis. C) Emphysema. D) Bronchial asthma. Show Answer Correct Answer: A) Pneumonia. 11. Which respiratory disorder is characterized by wheezing due to inflammation? A) Silicosis. B) Asbestosis. C) Emphysema. D) Asthma. Show Answer Correct Answer: D) 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) Asthma. B) Pleurisy. C) Emphysema. D) Pneumonia. Show Answer Correct Answer: C) 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) Warms up the air. C) Diffusion of gases. D) Cleans 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) Complete cartilaginous rings. B) Incomplete cartilaginous rings. C) Complete chitinous rings. D) Incomplete chitinous rings. Show Answer Correct Answer: B) Incomplete cartilaginous rings. 17. Why is the left lung slightly smaller than the right lung? A) To give space for the liver. B) To breathe easily. C) To give space for the heart. D) Becuase it is shaped like that. Show Answer Correct Answer: C) To give space for the heart. 18. The partial pressure of CO$_{2}$ in the venous blood is- A) Greater than in the tissue spaces. B) Lesser than in the tissue spaces. C) Lesser than in the arterial blood. D) Less than in alveoli. 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) 4.5-5.5 l. B) 3.5-4.5 l. C) 2.5-3.9 l. D) 1.5-2.5 l. Show Answer Correct Answer: B) 3.5-4.5 l. 23. How frog breathe in the water? A) Spiracle. B) Lungs. C) Moist skin. D) Gills. Show Answer Correct Answer: C) Moist skin. 24. 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). 25. Which part of the brain regulates the respiratory rhythm? A) Medulla Oblongata. B) Pons. C) Cerebellum. D) Cerebrum. Show Answer Correct Answer: A) Medulla Oblongata. 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