NEET Biology: Breathing and Exchange of Gases — Practice Set 12

Q1. Which of the following statements about respiratory disorders is incorrect?

A. Asthma causes inflammation of the bronchi and bronchioles.
B. Pneumonia is caused by viral or bacterial infection leading to alveolar inflammation.
C. Emphysema is a chronic disorder caused by damage to alveolar walls.
D. Silicosis is an allergic reaction leading to airway constriction.

Q2. Which of the following correctly defines vital capacity?

A. TV + ERV
B. TV + IRV
C. TV + IRV + ERV
D. TV + IRV + ERV + RV

Q3. What is the function of the respiratory rhythm center in the medulla oblongata?

A. Regulates oxygen transport
B. Controls the rate and rhythm of respiration
C. Enhances carbon dioxide elimination
D. Stimulates alveolar gas exchange

Q4. What is the normal respiratory rate in an average healthy human at rest?

A. 5-10 breaths per minute
B. 12-16 breaths per minute
C. 20-25 breaths per minute
D. 30-35 breaths per minute

Q5. Which factor does not influence the affinity of hemoglobin for oxygen?

A. Partial pressure of oxygen
B. pH level of the blood
C. Temperature
D. Nitrogen concentration

Q6. Which of the following statements about oxygen transport is incorrect?

A. Most oxygen is carried by hemoglobin.
B. Oxygen binding to hemoglobin is irreversible.
C. Oxygen is released more easily in tissues with high CO₂ levels.
D. A small amount of oxygen is dissolved in plasma.

Q7. Which of the following statements about respiratory disorders is incorrect?

A. Asthma is characterized by bronchial constriction and inflammation.
B. Pneumonia is caused by bacterial or viral infection.
C. Emphysema leads to the destruction of alveolar walls.
D. Silicosis is a genetic disorder affecting lung function.

Q8. Which of the following best explains why carbon dioxide is transported more efficiently than oxygen in the blood?

A. Carbon dioxide is highly soluble in plasma.
B. Oxygen binds weakly to hemoglobin.
C. Carbon dioxide is actively transported by RBCs.
D. Oxygen is transported primarily as bicarbonate ions.

Q9. Which of the following statements regarding lung volumes is incorrect?

A. Tidal volume is the air exchanged during normal breathing.
B. Vital capacity includes tidal volume, inspiratory reserve volume, and expiratory reserve volume.
C. Residual volume can be expelled from the lungs during forced expiration.
D. Functional residual capacity includes residual volume and expiratory reserve volume.

Q10. Which of the following statements about alveolar gas exchange is correct?

A. Gas exchange occurs through active transport.
B. Oxygen diffuses from the blood into the alveoli.
C. The diffusion of gases occurs due to partial pressure gradients.
D. Carbon dioxide moves into the blood from the alveoli.

Biology — Breathing and Exchange of Gases

Set 12 of 14

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Which of the following statements about respiratory disorders is incorrect?

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