Q. No.Assertion (A): Gaseous exchange in mammals occurs in alveoli, air sacs clustered at the tips of the finest bronchioles.
Reason (R): The type of epithelial layer of serous membranes such as the pleura is the same as that found in alveoli.
In light of the above statements, choose the correct option:
1. (A) and (R) are true, (R) is the correct explanation of (A)
2. (A) and (R) are true, (R) is not the correct explanation of (A)
3. (A) is true, (R) is false
4. (A) is false, (R) is true
Reason (R): The type of epithelial layer of serous membranes such as the pleura is the same as that found in alveoli.
In light of the above statements, choose the correct option:
1. (A) and (R) are true, (R) is the correct explanation of (A)
2. (A) and (R) are true, (R) is not the correct explanation of (A)
3. (A) is true, (R) is false
4. (A) is false, (R) is true
Subtopic: Â Respiratory System: Exchange of Gases |
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How many of the given factors affect the exchange of gases between blood and tissues?
a. Thickness of diffusion membrane
b. Solubility of gases
c. Pressure gradient
d. Concentration gradient
Mark the correct option from the following:
1. Two
2. One
3. Four
4. Zero
a. Thickness of diffusion membrane
b. Solubility of gases
c. Pressure gradient
d. Concentration gradient
Mark the correct option from the following:
1. Two
2. One
3. Four
4. Zero
Subtopic: Â Respiratory System: Exchange of Gases |
 79%
From NCERT
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Read the following statements and select the correct option
Statement A: Alveoli are the primary sites of exchange of gases which consist of single thin layer of flattened cells with irregular boundaries
Statement B: Thin, permeable of gases, moist and least vascular are come of the characters of a typical respiratory surface
1. Both statements (A) and (B) are correct
2. Both statements (A) and (B) are incorrect
3. Only statement (A) is correct
4. Only statement (A) is incorrect
Statement A: Alveoli are the primary sites of exchange of gases which consist of single thin layer of flattened cells with irregular boundaries
Statement B: Thin, permeable of gases, moist and least vascular are come of the characters of a typical respiratory surface
1. Both statements (A) and (B) are correct
2. Both statements (A) and (B) are incorrect
3. Only statement (A) is correct
4. Only statement (A) is incorrect
Subtopic: Â Respiratory System: Exchange of Gases |
 51%
From NCERT
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Assertion (A): Oxygen has to be continuously provided to the cells and CO2 has to be released from the cell.
Reason (R): CO2 is produced as a result of catabolic reactions in a cell.
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. (A) is false, but (R) is true.
Reason (R): CO2 is produced as a result of catabolic reactions in a cell.
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. (A) is false, but (R) is true.
Subtopic: Â Respiratory System: Exchange of Gases |
 55%
From NCERT
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Assertion (A): The thickness of the diffusion membrane is nearby a centimeter.
Reason (R): The thickness of the diffusion membrane facilitates gaseous exchange.
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. (A) is false, but (R) is true.
Reason (R): The thickness of the diffusion membrane facilitates gaseous exchange.
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. (A) is false, but (R) is true.
Subtopic: Â Respiratory System: Exchange of Gases |
 87%
From NCERT
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Assertion (A): At high altitudes, hypoxia may occur.
Reason (R): The percentage of O2 decreases in the air at high altitudes.
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 percentage of O2 decreases in the air at high altitudes.
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%
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Assertion (A): Alveoli are the major site of exchange of gases.
Reason (R): CO2 and O2 are exchanged at alveoli by simple diffusion.
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 and O2 are exchanged at alveoli by simple diffusion.
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: Exchange of Gases |
 50%
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): 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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