Class 11 Biology Breathing and Exchanges of Gases MCQs with Answers

Class 11 Biology Breathing and Exchange of Gases MCQs with Answers offer Sainik School aspirants a valuable resource for a focused study of respiratory processes. Specifically designed for the class 11 biology syllabus, these multiple-choice questions emphasize crucial concepts related to breathing and gas exchange. With clear and concise answers, students can efficiently self-assess, identifying strengths and areas for improvement. A comprehensive understanding of respiratory biology is fundamental for success, and these MCQs ensure thorough comprehension.

As students prepare for Sainik School entrance exams, engaging with these MCQs not only enhances exam readiness but also sharpens analytical and problem-solving skills. The content aligns with the broader goals of Sainik School education by emphasizing a holistic understanding of biological processes. This resource serves as a strategic tool, helping students build a strong foundation for future academic endeavors and meet the specific requirements of Sainik School biology examinations.

Q1. Where does the exchange of gases take place in the respiratory system?

1. Bronchi.
2. Bronchioles.
3. Alveoli.
4. Pulmonary Artery.

Q2. The maximum volume of air that can be released from the lungs by forceful expiration after deepest inspiration is
called the __.

1. Total lung capacity.
2. Vital capacity.
3. Tidal volume.
4. Ventilation rate.

Q3. It is known that exposure to carbon monoxide is harmful to animals because:

1. It reduces CO₂ transport.
2. It reduces O₂ transport.
3. It increases CO₂ transport.
4. It increases O₂ transport.

Q4. Mark the true statement among the following with reference to normal breathing:

1. Inspiration is a passive process where as expiration is active.
2. Inspiration is a active process where as expiration is passive.
3. Inspiration and expiration are active processes.
4. Inspiration and expiration are passive processes

Q5. Deoxygenated blood from heart comes to lungs via.

1. Pulmonary vein.
2. Systemic vein.
3. Pulmonary artery.
4. Systemic artery.

Q6. Smoking destroys the cilia in the respiratory passageways. This:

1. Makes it harder to keep the lungs clean.
2. Slows blood flow through lung blood vessels.
3. Decreases the surface area for respiration.
4. Makes it harder to move air in and out of the lungs

Q7. Rheumatic fever can cause damage.

1. Alveoli of the Lungs.
2. Heart valves.
3. Heart muscles.
4. Pleural membranes function.

Q8. Which one of the following statements is incorrect?

1. The principle of counter current flow facilitates efficient respiration in gills of fishes.
2. The residual air in lungs slightly decreases the efficiency of respriration in mammals.
3. In insects, circulating body fluids serve to distribute oxygen to tissues.
4. None of these.

Q9. A person suffers punctures in his chest cavity in an accident, without any damage to the lungs, its effect could be:

1. Reduced breathing rate.
2. Rapid increase in breathing rate.
3. No change in respiration.
4. Cessation of breathing.

Q10. What is the vital capacity of our lungs?

1. Inspiratory reserve volume plus tidal volume.
2. Total lung capacity minus expiratory reserve volume.
3. Inspiratory reserve volume plus expiratory reserve volume.
4. Total lung capacity minus residual volume

Q11. During inspiration the diaphragm.

1. Relaxes to become dome-shaped.
2. Shows no change.
3. Contracts and flattens.
4. None of these.

Q12. Air is breathed through.

1. Trachea – lungs – larynx – pharynx – alveoli.
2. Nose – larynx – pharynx – bronchus – alveoli – bronchioles.
3. Nostrils – pharynx – larynx – trachea – bronchi – bronchioles – alveoli.
4. Nose – mouth – lungs.

Q13. The largest quantity of air that can be expired after a maximal inspiratory effort is called.

1. Vital capacity.
2. Residual volume.
3. Tidal volume.
4. Total lung volume.

Q14. In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by:

1. Alveolar epithelium only.
2. Alveolar epithelium and capillary endothelium.
3. Alveolar epithelium, capillary endothelium and tunica adventitia.
4. Alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia.

Q15. Skin is an accessory organ of respiration in:

1. Human
2. Frog
3. Rabbit
4. Lizard