Select Chapter Topics:
Q. No.
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.
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |Â Respiratory Organs |
 83%
Level 1: 80%+
Hints
| 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. |
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
 89%
Level 1: 80%+
Hints
| 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. |
Subtopic: Â Respiratory System: Pulmonary Volumes & Capacities |Â Respiratory System: Exchange of Gases |
 79%
Level 2: 60%+
Hints
Given below are two statements:
| Assertion (A): | \(O_2\) binds with Hb in an irreversible manner. |
| Reason (R): | \(CO_2\) 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 |
 73%
Level 2: 60%+
Hints
Given below are two statements:
| Assertion (A): | The amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2. |
| Reason (R): | The solubility of CO2 in blood is 20-25 times higher than that of 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 System: Exchange of Gases |
 87%
Level 1: 80%+
Hints
| Assertion (A): | In the alveoli, where there is high pO2, low pCO2, lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhemoglobin. |
| Reason (R): | Every 100 mL of oxygenated blood deliver around 2.5 mL of O2 to the tissues normally. |
| 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 |
 91%
Level 1: 80%+
Hints
| Assertion (A): | CO2 is carried by Hb as carbaminohaemoglobin (about 20-25%). |
| Reason (R): | When pCO2, is high and pO2 is low as in tissues, more binding of CO2 to Hb occurs. |
| 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 |
 67%
Level 2: 60%+
Hints
| Assertion (A) | The respiratory rhythm centre, located in the pons region of brain is responsible for regulation of respiration. |
| Reason (R) | Pneumotaxic centre, located in the medulla region of brain moderates the respiratory rhythm 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 |
 71%
Level 2: 60%+
Hints
Assertion (A): The lungs present in the thoracic chamber is an anatomically air-tight chamber.
Reason (R): The role of oxygen in the regulation fo respiratory rhythm is quite significant.
Reason (R): The role of oxygen in the regulation fo respiratory rhythm is quite significant.
| 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 System: Regulation of Respiration |
 62%
Level 2: 60%+
Hints
Subtopic: Â Respiratory System: Transport of Gases Part 1 |Â Respiratory System: Transport of Gases Part 2 |Â Respiratory System: Transport of Gases |
 63%
Level 2: 60%+
Hints
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.