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Q. No.Assertion (A): Pneumotaxic centre can moderate the functions of the respiratory rhythm centre.
Reason (R): Neural signal from pneumotaxic centre can reduce the duration of inspiration and thereby alter the respiratory centre.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Regulation of Respiration |
 81%
From NCERT
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Assertion (A): Hb cannot get saturated with O2 more than 70%.
Reason (R): THe affinity O2 to Hb increases with the rise of pCO2.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): THe affinity O2 to Hb increases with the rise of pCO2.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Transport of Gases Part 1 |Â Respiratory System: Transport of Gases Part 2 |Â Respiratory System: Transport of Gases |
 68%
From NCERT
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Assertion (A): Inspiration occurs when intra-pulmonary pressure is lower than atmospheric pressure.
Reason (R): Inspiration is initiated by the relaxation of diaphragm and intercostal muscles.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Inspiration is initiated by the relaxation of diaphragm and intercostal muscles.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Exchange of Gases |
 86%
From NCERT
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Assertion (A): In the walls of bronchi and bronchioles are present stretch receptors.
Reason (R): Stretch receptors are stimulated by overstretching of the lungs.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Stretch receptors are stimulated by overstretching of the lungs.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
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Assertion (A): CO combines with Hb at the same point on Hb as does O2.
Reason (R): CO binds with Hb about 200 times faster than O2.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): CO binds with Hb about 200 times faster than O2.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory Disorders: Part 1 |Â Respiratory Disorders: Part 2 |Â Respiratory Disorders - III |
 61%
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Assertion (A): Nasopharynx is a portion of pharynx present above the soft palate at the back of the nose.
Reason (R): Major chamber opens into nasopharynx through the internal nares.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Major chamber opens into nasopharynx through the internal nares.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
 66%
From NCERT
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Assertion (A): The tracheae, primary, secondary and tertiary bronchi and initial bronchioles are supported by incomplete cartilaginous rings.
Reason (R): The cartilaginous rings prevent these structure from collapsing.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): The cartilaginous rings prevent these structure from collapsing.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |Â Respiratory Organs |
 80%
From NCERT
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Assertion (A): The two lungs are covered by a double-layered pleura, with pleural fluid between them.
Reason (R): Pleural fluid reduces the friction on the lung surface.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Pleural fluid reduces the friction on the lung surface.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
 88%
From NCERT
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Assertion (A): The value of tidal volume in a healthy human is about 6000-8000 mL/min.
Reason (R): The volume of air remaining in the lungs even after forcible expiration is 1100-1200 mL.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): The volume of air remaining in the lungs even after forcible expiration is 1100-1200 mL.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Pulmonary Volumes & Capacities |Â Respiratory System: Exchange of Gases |
 84%
From NCERT
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Assertion (A): O2 binds with Hb in an irreversible manner.
Reason (R): CO2 combines with Hb both is an irreversible and reversible manner.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): CO2 combines with Hb both is an irreversible and reversible manner.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Respiratory System: Exchange of Gases |Â Respiratory System: Transport of Gases Part 1 |Â Respiratory System: Transport of Gases Part 2 |Â Respiratory System: Transport of Gases |
 72%
From NCERT
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