Take 5 chapter-wise practice tests plus 1 full module test on Breathing and Exchange of Gases for NEET with +4/-1 scoring, answer review, and concise explanations.
Attempt 5 focused chapter practice tests and 1 mixed module test from reframed NEET-style breathing questions built from readable biology PDFs.
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1. Among vertebrates, the chief respiratory organs in adult human beings are the:
Explanation: Humans exchange gases mainly through the lungs, though a few other surfaces play minor roles.
2. In insects such as cockroach, exchange of respiratory gases takes place through the:
Explanation: Insects use a tracheal network that opens to the outside through spiracles.
3. An adult frog can exchange gases through skin, buccopharyngeal lining, and lungs. This means frog respiration is:
Explanation: Adult frogs use more than one respiratory surface depending on the condition.
4. Which sequence correctly traces the normal movement of inhaled air in humans?
Explanation: This is the standard pathway of inspired air in the human respiratory tract.
5. The actual sites of gaseous exchange in lungs are the:
Explanation: Alveoli provide the large, thin, moist surface required for rapid diffusion of gases.
6. The fluid present between the two pleural membranes mainly helps in:
Explanation: Pleural fluid allows the lungs to move smoothly during breathing.
7. In aquatic vertebrates like fishes, the principal respiratory organs are:
Explanation: Fishes exchange gases mainly by gills, which are well suited for aquatic respiration.
8. Earthworm performs gaseous exchange mainly through its:
Explanation: Earthworms use their moist body surface for cutaneous respiration.
9. The cartilaginous flap that prevents food from entering the trachea during swallowing is the:
Explanation: The epiglottis covers the glottis during swallowing and protects the airway.
10. The human larynx is important in respiration and also in:
Explanation: The larynx houses vocal cords and helps in phonation.
11. The C-shaped cartilaginous rings in the trachea mainly serve to:
Explanation: Tracheal rings keep the airway patent during breathing.
12. Bronchi divide repeatedly inside the lungs to form smaller passages called:
Explanation: The branching airways narrow progressively into bronchioles before ending in alveolar sacs.
13. A chief adaptation of alveoli for gas exchange is their:
Explanation: Millions of alveoli together provide enormous surface area for rapid diffusion.
14. The internal lining of the respiratory passage helps because inhaled air is:
Explanation: The nasal and airway lining condition incoming air before it reaches alveoli.
15. The membrane directly covering the lungs is the:
Explanation: The visceral pleura adheres to the lungs, whereas the parietal pleura lines the thoracic cavity.
16. Which structure belongs to the conducting part and not the exchange part of the respiratory system?
Explanation: The conducting part transports and conditions air; the respiratory part begins where gas exchange is possible.
17. The respiratory zone of lungs begins functionally where:
Explanation: The respiratory part includes structures associated with actual exchange of gases.
18. Which pair is correctly matched?
Explanation: The cockroach uses a tracheal system; the other matches are incorrect.
19. The external openings through which air enters the human respiratory tract are the:
Explanation: Air enters via nostrils before passing into the nasal chambers.
20. If the tracheal cartilaginous rings were absent, the most likely immediate problem would be:
Explanation: The rings help keep the trachea open as pressure changes during respiration.
21. Revision Booster 1. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Among vertebrates, the chief respiratory organs in adult human beings are the:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Humans exchange gases mainly through the lungs, though a few other surfaces play minor roles.
22. Revision Booster 2. Recheck this Breathing and Exchange of Gases concept with a fresh option order. In insects such as cockroach, exchange of respiratory gases takes place through the:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Insects use a tracheal network that opens to the outside through spiracles.
23. Revision Booster 3. Recheck this Breathing and Exchange of Gases concept with a fresh option order. An adult frog can exchange gases through skin, buccopharyngeal lining, and lungs. This means frog respiration is:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Adult frogs use more than one respiratory surface depending on the condition.
24. Revision Booster 4. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Which sequence correctly traces the normal movement of inhaled air in humans?
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. This is the standard pathway of inspired air in the human respiratory tract.
25. Revision Booster 5. Recheck this Breathing and Exchange of Gases concept with a fresh option order. The actual sites of gaseous exchange in lungs are the:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Alveoli provide the large, thin, moist surface required for rapid diffusion of gases.
26. During quiet inspiration, the diaphragm generally:
Explanation: Diaphragm contraction enlarges the thoracic cavity and lowers intrapulmonary pressure.
27. As a result of inspiration, intrapulmonary pressure becomes:
Explanation: Air enters lungs when intrapulmonary pressure falls just below atmospheric pressure.
28. Quiet expiration in a healthy person is usually:
Explanation: During normal breathing, expiration mostly occurs because inspiratory muscles relax and tissues recoil.
29. Elevation of ribs and sternum during inspiration primarily causes:
Explanation: Thoracic expansion lowers pressure inside the lungs and helps air entry.
30. If thoracic volume increases but no pressure difference develops, air will:
Explanation: Bulk movement of air depends on a pressure gradient between atmosphere and lungs.
31. External intercostal muscles assist mainly in:
Explanation: They raise ribs and sternum during inspiration, enlarging the thoracic cavity.
32. Inspiration occurs because thoracic expansion causes a drop in:
Explanation: Air moves inward when intrapulmonary pressure falls below atmospheric pressure.
33. Forced expiration mainly involves active contraction of:
Explanation: Forced expiration is active and uses expiratory muscle groups.
34. At the end of a normal inspiration, intrapulmonary pressure becomes approximately:
Explanation: Airflow stops once intrapulmonary and atmospheric pressures equalize at the end of inspiration.
35. The diaphragm contributes to inspiration mainly by moving:
Explanation: Flattening of the diaphragm increases vertical thoracic diameter.
36. Raising of the ribs during inspiration increases mainly the:
Explanation: Rib movement expands thorax in front-back and side-to-side directions.
37. Which statement about quiet breathing is correct?
Explanation: Quiet inspiration needs muscle contraction, while quiet expiration largely depends on relaxation and recoil.
38. The tendency of lungs to return to their original size after being stretched assists mainly in:
Explanation: Elastic recoil of lungs and thoracic wall helps push air out during normal expiration.
39. Breathing mechanics in simple terms illustrate that when thoracic volume increases, pressure inside the lungs tends to:
Explanation: As per pressure-volume relation, an increase in thoracic volume causes a fall in intrapulmonary pressure.
40. Damage to the nerve supplying the diaphragm would most directly impair:
Explanation: The diaphragm is the chief inspiratory muscle, so its paralysis compromises inspiration severely.
41. Air leaves the lungs during expiration because intrapulmonary pressure becomes:
Explanation: Expiration requires the pressure inside lungs to exceed atmospheric pressure slightly.
42. Under normal conditions, the pleural cavity helps breathing mainly by allowing:
Explanation: Pleural fluid reduces friction between pleural layers as lungs expand and contract.
43. The immediate cause of air entering alveoli is best described as:
Explanation: Bulk flow of air during breathing occurs because of pressure differences between atmosphere and lungs.
44. Which pair changes together during inspiration?
Explanation: These coordinated changes draw air into the lungs.
45. At rest, expiration begins when inspiratory muscles:
Explanation: Relaxation of the diaphragm and external intercostals allows thoracic recoil and expiration.
46. Revision Booster 1. Recheck this Breathing and Exchange of Gases concept with a fresh option order. During quiet inspiration, the diaphragm generally:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Diaphragm contraction enlarges the thoracic cavity and lowers intrapulmonary pressure.
47. Revision Booster 2. Recheck this Breathing and Exchange of Gases concept with a fresh option order. As a result of inspiration, intrapulmonary pressure becomes:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Air enters lungs when intrapulmonary pressure falls just below atmospheric pressure.
48. Revision Booster 3. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Quiet expiration in a healthy person is usually:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. During normal breathing, expiration mostly occurs because inspiratory muscles relax and tissues recoil.
49. Revision Booster 4. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Elevation of ribs and sternum during inspiration primarily causes:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Thoracic expansion lowers pressure inside the lungs and helps air entry.
50. Revision Booster 5. Recheck this Breathing and Exchange of Gases concept with a fresh option order. If thoracic volume increases but no pressure difference develops, air will:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Bulk movement of air depends on a pressure gradient between atmosphere and lungs.
51. The amount of air moved in or out during a normal relaxed breath is called:
Explanation: Tidal volume is the air inspired or expired in a normal quiet breath.
52. Air that remains in the lungs even after a forceful expiration is known as:
Explanation: Residual volume prevents lung collapse and cannot be expired voluntarily.
53. Vital capacity is best defined as:
Explanation: Vital capacity represents the greatest exchangeable amount of air in a full respiratory effort.
54. Inspiratory capacity equals:
Explanation: Inspiratory capacity is the maximum amount a person can inhale after a normal expiration.
55. Functional residual capacity corresponds to the air remaining in lungs after a normal expiration. It equals:
Explanation: FRC is the sum of air that can still be expelled plus the volume that always remains.
56. Which one of the following can be directly measured by spirometry?
Explanation: Spirometry records air that moves in and out; residual volume and capacities including RV cannot be directly measured by simple spirometry.
57. The additional volume of air that can be inhaled after a normal inspiration is:
Explanation: IRV is the extra air inspired beyond a normal tidal inspiration.
58. The extra air that can be forcibly exhaled after a normal expiration is called:
Explanation: ERV is the additional air expelled after a normal tidal expiration.
59. Total lung capacity is equal to:
Explanation: TLC includes all air the lungs can contain, including the residual volume.
60. Which one includes the residual volume as a component?
Explanation: FRC equals ERV + RV, so it includes residual volume.
61. Vital capacity can also be written as:
Explanation: Vital capacity includes all movable lung volumes except the residual volume.
62. A reduced vital capacity most directly suggests a reduction in the maximum amount of air a person can:
Explanation: Vital capacity measures the maximum exchangeable air after deepest inspiration.
63. Residual volume is physiologically useful because it:
Explanation: A certain amount of air always remains in lungs, helping keep alveoli open.
64. If a person takes a normal breath out and then inhales maximally, the air inhaled equals:
Explanation: Inspiratory capacity is the maximum amount inspired after a normal expiration.
65. Expiratory capacity is best represented by:
Explanation: Expiratory capacity is the amount exhaled after a normal inspiration, equal to tidal volume plus ERV.
66. The average tidal volume in a healthy resting adult is approximately:
Explanation: NEET commonly uses about 500 mL as the tidal volume of a normal adult.
67. Which of the following is a capacity rather than a basic volume?
Explanation: Capacities are combinations of two or more respiratory volumes.
68. Why can residual volume not be obtained directly by simple spirometry?
Explanation: Spirometry records air moving in and out; residual volume stays behind and cannot be exhaled voluntarily.
69. Which pairing is correct?
Explanation: Inspiratory capacity consists of tidal volume plus inspiratory reserve volume.
70. Total lung capacity is the highest when the lungs are:
Explanation: TLC represents the fullest amount of air the lungs can hold.
71. Revision Booster 1. Recheck this Breathing and Exchange of Gases concept with a fresh option order. The amount of air moved in or out during a normal relaxed breath is called:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Tidal volume is the air inspired or expired in a normal quiet breath.
72. Revision Booster 2. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Air that remains in the lungs even after a forceful expiration is known as:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Residual volume prevents lung collapse and cannot be expired voluntarily.
73. Revision Booster 3. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Vital capacity is best defined as:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Vital capacity represents the greatest exchangeable amount of air in a full respiratory effort.
74. Revision Booster 4. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Inspiratory capacity equals:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Inspiratory capacity is the maximum amount a person can inhale after a normal expiration.
75. Revision Booster 5. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Functional residual capacity corresponds to the air remaining in lungs after a normal expiration. It equals:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. FRC is the sum of air that can still be expelled plus the volume that always remains.
76. Gas exchange across the alveolar membrane occurs mainly by:
Explanation: Oxygen and carbon dioxide move down their partial pressure gradients across the respiratory membrane.
77. The thin membrane across which alveolar gas exchange occurs includes alveolar epithelium, basement substances, and:
Explanation: The respiratory membrane separates alveolar air from blood and includes capillary endothelium on the blood side.
78. Most oxygen in blood is carried:
Explanation: A major portion of oxygen is transported as oxyhaemoglobin in RBCs.
79. In human blood, the largest fraction of carbon dioxide is transported as:
Explanation: Most CO2 is converted into bicarbonate and transported in plasma.
80. Oxygen diffuses from alveoli into blood because in alveolar air its partial pressure is:
Explanation: Diffusion occurs down the partial pressure gradient from alveoli to blood.
81. A fall in blood pH generally shifts oxygen dissociation in a way that:
Explanation: The Bohr effect helps haemoglobin release oxygen more readily in acidic, actively metabolising tissues.
82. In the lungs, carbon dioxide diffuses mainly from:
Explanation: CO2 moves down its gradient from venous blood into alveolar air.
83. The oxygen-carrying pigment present in RBCs is:
Explanation: Haemoglobin reversibly binds oxygen and transports most of it in blood.
84. Formation of oxyhaemoglobin is favoured where:
Explanation: High alveolar oxygen tension favours loading of oxygen onto haemoglobin.
85. A smaller fraction of carbon dioxide is transported attached to haemoglobin as:
Explanation: Some CO2 binds to globin portions of haemoglobin forming carbaminohaemoglobin.
86. Oxygen unloading in tissues is facilitated when:
Explanation: Metabolically active tissues promote oxygen dissociation from haemoglobin.
87. One key reason respiratory membrane is efficient is that it is:
Explanation: The diffusion distance is tiny, which speeds movement of respiratory gases.
88. The conversion of carbon dioxide to bicarbonate in blood is accelerated by the enzyme:
Explanation: Carbonic anhydrase in RBCs rapidly catalyses the reversible hydration of carbon dioxide.
89. If the diffusion gradient for oxygen between alveoli and blood falls, oxygen uptake would generally:
Explanation: Gas exchange efficiency depends strongly on the partial pressure gradient.
90. Most carbon dioxide is finally transported in plasma in the form of:
Explanation: CO2 is largely converted to bicarbonate for transport in blood.
91. Which location is best suited for maximum oxygen loading onto haemoglobin?
Explanation: High oxygen partial pressure in alveoli promotes oxygen binding in pulmonary capillaries.
92. The moist nature of alveolar lining is important mainly because it:
Explanation: Respiratory gases dissolve in the moist lining before diffusing across membranes.
93. Which statement is correct?
Explanation: Without haemoglobin, blood could carry only a very small dissolved amount of oxygen.
94. Active tissues receive oxygen more efficiently because they tend to have:
Explanation: These conditions favour unloading of oxygen from haemoglobin in tissue capillaries.
95. The fundamental mechanism of alveolar gas exchange is:
Explanation: No active transport is needed; the gases move according to partial pressure differences.
96. Revision Booster 1. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Gas exchange across the alveolar membrane occurs mainly by:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Oxygen and carbon dioxide move down their partial pressure gradients across the respiratory membrane.
97. Revision Booster 2. Recheck this Breathing and Exchange of Gases concept with a fresh option order. The thin membrane across which alveolar gas exchange occurs includes alveolar epithelium, basement substances, and:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. The respiratory membrane separates alveolar air from blood and includes capillary endothelium on the blood side.
98. Revision Booster 3. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Most oxygen in blood is carried:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. A major portion of oxygen is transported as oxyhaemoglobin in RBCs.
99. Revision Booster 4. Recheck this Breathing and Exchange of Gases concept with a fresh option order. In human blood, the largest fraction of carbon dioxide is transported as:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Most CO2 is converted into bicarbonate and transported in plasma.
100. Revision Booster 5. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Oxygen diffuses from alveoli into blood because in alveolar air its partial pressure is:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Diffusion occurs down the partial pressure gradient from alveoli to blood.
101. The primary respiratory rhythm centre in humans is located in the:
Explanation: Medullary respiratory centres help generate the basic rhythm of breathing.
102. The strongest normal chemical stimulus for increasing breathing rate is usually a rise in:
Explanation: Elevated CO2 and the associated fall in pH strongly stimulate respiratory centres.
103. Repeated difficulty in breathing due to spasm and inflammation of bronchi/bronchioles is characteristic of:
Explanation: Asthma is associated with allergic inflammation and narrowing of the air passages.
104. Emphysema is marked by damage that especially reduces the efficiency of:
Explanation: Destruction of alveolar walls decreases respiratory surface and impairs expiration.
105. Workers regularly exposed to dust from certain industries may develop respiratory trouble grouped as:
Explanation: Chronic dust exposure can inflame or scar lung tissue, reducing gas exchange efficiency.
106. During vigorous exercise, ventilation increases mainly to meet the need for:
Explanation: Exercise elevates metabolic demand, so breathing rises to match tissue gas exchange requirements.
107. The pons modifies the respiratory rhythm primarily by:
Explanation: Pontine centres help modulate the respiratory rhythm generated by medullary centres.
108. Chemoreceptors help regulate breathing by sensing changes mainly in:
Explanation: Chemoreceptors detect chemical changes relevant to gas exchange and acid-base balance.
109. Asthma makes expiration difficult mainly because of:
Explanation: Inflammation and smooth muscle constriction narrow the air passages in asthma.
110. Chronic smoking is strongly associated with emphysema because it damages:
Explanation: Alveolar wall destruction reduces respiratory surface and elastic recoil.
111. Long-term inhalation of industrial dust often affects lungs by causing:
Explanation: Occupational dust exposure can scar lung tissue and reduce gas exchange efficiency.
112. During heavy exercise, breathing rate rises mainly to satisfy increased:
Explanation: Working tissues need more oxygen and generate more carbon dioxide, driving increased ventilation.
113. At high altitude, shortness of breath can occur initially because:
Explanation: Reduced oxygen partial pressure at altitude lowers the diffusion gradient for oxygen uptake.
114. An increase in blood hydrogen ion concentration generally causes breathing to:
Explanation: Raised H+ stimulates respiratory centres indirectly, often through increased CO2.
115. Which disorder is correctly paired with its feature?
Explanation: Emphysema damages alveolar walls and decreases effective respiratory area.
116. If medullary respiratory centres were severely depressed, the most direct effect would be on:
Explanation: Medullary centres are central to establishing the respiratory rhythm.
117. Why is carbon dioxide considered a strong regulator of breathing?
Explanation: CO2 influences acidity, and these changes are sensed by chemoreceptors controlling ventilation.
118. A person with chronic narrowing of airways is likely to have maximum difficulty during:
Explanation: Expelling air becomes especially difficult when airways are narrowed, as in asthma.
119. Regular aerobic training often improves respiratory efficiency because it enhances:
Explanation: Training improves cardiopulmonary performance and effective oxygen handling.
120. A disease that reduces elastic recoil of lungs would most strongly affect the ability to:
Explanation: Loss of elastic recoil makes expiration inefficient, a hallmark feature in emphysema.
121. Revision Booster 1. Recheck this Breathing and Exchange of Gases concept with a fresh option order. The primary respiratory rhythm centre in humans is located in the:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Medullary respiratory centres help generate the basic rhythm of breathing.
122. Revision Booster 2. Recheck this Breathing and Exchange of Gases concept with a fresh option order. The strongest normal chemical stimulus for increasing breathing rate is usually a rise in:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Elevated CO2 and the associated fall in pH strongly stimulate respiratory centres.
123. Revision Booster 3. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Repeated difficulty in breathing due to spasm and inflammation of bronchi/bronchioles is characteristic of:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Asthma is associated with allergic inflammation and narrowing of the air passages.
124. Revision Booster 4. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Emphysema is marked by damage that especially reduces the efficiency of:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Destruction of alveolar walls decreases respiratory surface and impairs expiration.
125. Revision Booster 5. Recheck this Breathing and Exchange of Gases concept with a fresh option order. Workers regularly exposed to dust from certain industries may develop respiratory trouble grouped as:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Chronic dust exposure can inflame or scar lung tissue, reducing gas exchange efficiency.