NEET Biology: Breathing and Exchange of Gases — Practice Set 10

Q1. Which of the following statements regarding oxygen transport is correct?

A. Oxygen is mainly transported in dissolved form in plasma.
B. Hemoglobin binds to oxygen reversibly.
C. All oxygen in the blood is transported by red blood cells.
D. Oxygen transport is not affected by temperature or pH changes.

Q2. Which disorder is caused by long-term exposure to dust and results in fibrosis of lung tissues?

A. Emphysema
B. Asthma
C. Silicosis
D. Pneumonia

Q3. Which center in the brainstem regulates the basic rhythm of respiration?

A. Cerebellum
B. Pneumotaxic center
C. Respiratory rhythm center in the medulla
D. Hypothalamus

Q4. Which of the following statements about breathing rate is incorrect?

A. Breathing rate is controlled by the medulla oblongata.
B. Increased CO₂ levels stimulate increased breathing rate.
C. Breathing rate is unaffected by oxygen levels in the blood.
D. Chemoreceptors help regulate breathing rate.

Q5. Which of the following statements about the diaphragm is incorrect?

A. It contracts and moves downward during inspiration.
B. It relaxes and moves upward during expiration.
C. It is a skeletal muscle that plays a role in breathing.
D. It remains stationary during the breathing cycle.

Q6. Which of the following factors increases the oxygen-binding affinity of hemoglobin?

A. Increase in pCO₂
B. Increase in H⁺ concentration
C. Decrease in temperature
D. Both 2 and 3

Q7. Which of the following best describes the function of the pneumotaxic center?

A. Initiates voluntary breathing
B. Moderates the respiratory rhythm center
C. Controls the diffusion of gases
D. Regulates oxygen transport

Q8. Which of the following is NOT a factor affecting the rate of diffusion of gases in the lungs?

A. Partial pressure gradient
B. Membrane thickness
C. Solubility of gases
D. Heart rate

Q9. 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.

Q10. Which of the following statements about carbon dioxide transport is incorrect?

A. Most CO₂ is transported as bicarbonate ions.
B. CO₂ binds to hemoglobin to form carbamino-hemoglobin.
C. CO₂ transport does not affect blood pH.
D. Carbonic anhydrase facilitates CO₂ conversion into bicarbonate.

Biology — Breathing and Exchange of Gases

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Which of the following statements regarding oxygen transport is correct?

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