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Q. No.Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange O2 with CO2 by simple diffusion:
1. conducted to and from the tissues by a network of tubes.
2. over their entire body surface.
3. using their moist cuticle.
4. across the gills.
Subtopic: Â Respiratory Organs |
 89%
From NCERT
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A healthy man can inspire or expire approximately:
1. 500 mL of air per minute.
2. 2500 to 3000 mL of air per minute.
3. 1000 mL to 1100 mL per minute.
4. 6000 to 8000 mL of air per minute.
1. 500 mL of air per minute.
2. 2500 to 3000 mL of air per minute.
3. 1000 mL to 1100 mL per minute.
4. 6000 to 8000 mL of air per minute.
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |Â Respiratory System: Pulmonary Volumes & Capacities |
 78%
From NCERT
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Volume of air that will remain in the lungs after a normal expiration averages:
1. 1000 mL to 1100 mL.
2. 2100 mL to 2300 mL.
3. 1100 mL to 1200 mL.
4. 2500 mL to 3000 mL.
1. 1000 mL to 1100 mL.
2. 2100 mL to 2300 mL.
3. 1100 mL to 1200 mL.
4. 2500 mL to 3000 mL.
Subtopic: Â Respiratory System: Pulmonary Volumes & Capacities |
 50%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | The partial pressure of oxygen is equal in alveoli and oxygenated blood. |
| Statement II: | The partial pressure of carbon dioxide is equal in alveoli and deoxygenated blood. |
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Â Respiratory System: Exchange of Gases |
 73%
From NCERT
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Consider the given two statements:
| Assertion (A): | O2 gets bound to haemoglobin in the lung surface and gets dissociated at the tissues. |
| Reason (R): | In the alveoli, there is high pO2, low pCO2, lesser H+ concentration and lower temperature whereas in the tissues, low pO2, high pCO2, high H+ concentration and higher temperature exist. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Â Respiratory System: Pulmonary Ventilation |Â Respiratory System: Exchange of Gases |Â Respiratory System: Regulation of Respiration |
 86%
From NCERT
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At about what partial pressure of oxygen [mm Hg] is the haemoglobin in blood 50% saturated?
| 1. | 95 | 2. | 75 |
| 3. | 27 | 4. | 15 |
Subtopic: Â Respiratory System: Transport of Gases |
From NCERT
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In tissues:
1. a and b are correct
2. a and d are correct
3. b and c are correct
4. c and d are correct
| a. | pCO2 is high and pO2 is low |
| b. | dissociation of CO2 from carbamino-haemoglobin takes place |
| c. | pCO2 is low and pO2 is high |
| d. | more binding of carbon dioxide to haemoglobin occurs |
1. a and b are correct
2. a and d are correct
3. b and c are correct
4. c and d are correct
Subtopic: Â Respiratory System: Exchange of Gases |
 84%
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Regarding the chemical regulation of respiration in humans:
1. Only I and II are correct
2. Only II and III are incorrect
3. I, II and III are incorrect
4. Only I and III are correct
| I: | A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO2 and hydrogen ions. |
| II: | Receptors associated with aortic arch and carotid artery can recognise changes in O2 concentration and send necessary signals to the rhythm centre for remedial actions. |
| III: | The role of oxygen in the regulation of respiratory rhythm is most significant. |
2. Only II and III are incorrect
3. I, II and III are incorrect
4. Only I and III are correct
Subtopic: Â Respiratory System: Exchange of Gases |Â Respiratory System: Regulation of Respiration |
 59%
From NCERT
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A chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased will be:
| 1. | Emphysema | 2. | Asthma |
| 3. | Tuberculosis | 4. | Common cold |
Subtopic: Â Respiratory Disorders - III |
 92%
From NCERT
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The lungs are covered by the pleural membranes which mainly help in:
1. maintaining pressure
2. increasing thoracic pressure
3. removing foreign particles
4. reducing friction
1. maintaining pressure
2. increasing thoracic pressure
3. removing foreign particles
4. reducing friction
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |Â Respiratory Organs |
 88%
From NCERT
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