- 1(current)
Q. No.The conducting part of the human respiratory system:
1. Only I and II are correct
2. Only II and IV are correct
3. Only I, II and III are correct
4. Only II, III and IV are correct
| I: | transports the atmospheric air to the alveoli |
| II: | clears inhaled air from foreign particles |
| III: | humidifies and also brings the air to body temperature |
| IV: | is the site of actual diffusion of O2 and CO2 between blood and atmospheric air |
1. Only I and II are correct
2. Only II and IV are correct
3. Only I, II and III are correct
4. Only II, III and IV are correct
Subtopic: Respiratory System: Trachea & Basic Anatomy of Lung | Respiratory System: Regulation of Respiration | Respiratory Organs |
91%
From NCERT
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Consider the given two statements:
| Assertion (A): | It is critical that the lungs are situated in the thoracic chamber which is anatomically an air-tight chamber. |
| Reason (R): | Changes in thoracic cavity volume generate pressure differences that lead to passive expansion and contraction of the lungs during breathing. |
| 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: Respiratory Organs |
55%
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The statement “Gills are specialised vascular structures used for respiration in both aquatic and terrestrial arthropods” is incorrect. Which of the following provide valid reasons for the incorrectness of this statement?
Choose the correct answer:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Gills are found in aquatic arthropods (e.g., crustaceans) and aquatic insect larvae but are absent in adult terrestrial arthropods. |
| II: | Terrestrial arthropods use a tracheal system, not gills, for gas exchange. |
| III: | Gills require a moist environment, which is absent in terrestrial habitats. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Respiratory Organs |
68%
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Gills are highly effective respiratory structures in aquatic animals but are not adapted for use in terrestrial environments. Which of the following best explains the primary reason for their unsuitability on land?
| 1. | Gills are highly fragile and tend to collapse in air, drastically reducing their effective surface area for gas exchange. |
| 2. | Gills are incapable of detecting changes in atmospheric oxygen concentration. |
| 3. | Gills actively repel oxygen molecules in the absence of water. |
| 4. | Gills lack any blood vessels in their structure, making them inefficient for oxygen transport in air. |
Subtopic: Respiratory Organs |
55%
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- 1(current)
Q. No.
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