Question 1 of 16
Vital capacity of lung is ________.
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Breathing and Exchange of Gases NEET PYQs
Class XI Biology • NCERT Based • NEET Practice
Question 2 of 16
Under normal physiological conditions in human
being every 100 ml of oxygenated blood can deliver
___________ ml of O2 to the tissues.
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Question 3 of 16
Which of the following is not the function of
conducting part of respiratory system ?
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Question 4 of 16
The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :
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Question 5 of 16
Select the favourable conditions required for the
formation of oxyhaemoglobin at the alveoli.
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Question 6 of 16
Select the correct events that occur during
inspiration.
A. Contraction of diaphragm
B. Contraction of external inter-costal muscles
C. Pulmonary volume decreases
D. Intra pulmonary pressure increases
A. Contraction of diaphragm
B. Contraction of external inter-costal muscles
C. Pulmonary volume decreases
D. Intra pulmonary pressure increases
Explanation:
During inspiration, the diaphragm contracts and flattens, and the external intercostal muscles contract to raise the ribs. This enlarges the thoracic cavity, increasing pulmonary (lung) volume. As a result, intra-pulmonary pressure falls below atmospheric pressure, allowing air to flow into the lungs. Therefore, A and B are correct, while C (volume decreases) and D (pressure increases) are incorrect.
🧠 Did You Know?Inhalation involves active muscular work; exhalation at rest is mainly a passive process where the diaphragm and intercostals relax, pushing air out as the chest cavity returns to its smaller volume.
💡 NCERT Memory Line:During inspiration, rib cage moves up and out; diaphragm contracts to increase thoracic volume, causing a decrease in intra-pulmonary pressure.
Question 7 of 16
Identify the wrong statement with reference to
transport of oxygen.
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Question 8 of 16
The Total Lung Capacity (TLC) is the total volume of air accomodated in the lungs at the end of a forced inspiration. This includes:
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Question 9 of 16
Match the following columns and select the correct option :
| Column-I | Column-II |
|---|---|
| (A)Pneumotaxic Centre | (I)Alveoli |
| (B)O2 Dissociation curve | (II) Pons region of brain |
| (C)Carbonic Anhydrase | (III)Haemoglobin |
| (D)Primary site of exchange of gases | (IV)R.B.C. |
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Question 10 of 16
According to Central Pollution Control Board [CPCB]
what size (in diameter) of particulate is responsible for causing greater harm to human health ?
Explanation will be generated when opened.