Class XI · Biology practice

Breathing and Exchange of Gases PYQs

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16 questions in this collection · Page 1 of 2

Question 1 of 16

🟢 NEET 2023 📘 CLASS XI

Breathing And Exchange Of Gases

Vital capacity of lung is ________.

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Question 2 of 16

🟢 NEET 2022 📘 CLASS XI

Breathing And Exchange Of Gases

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

🟢 NEET 2022 📘 CLASS XI

Breathing And Exchange Of Gases

Which of the following is not the function of conducting part of respiratory system ?

AI-generated explanation. Check against your textbook.

Explanation:

The conducting part of the respiratory system includes the nose, nasal cavity, pharynx, larynx, trachea, and bronchi. Its functions are to humidify the inhaled air, warm it to body temperature, and filter or clear out foreign particles. Gas exchange (O2 and CO2 diffusion) occurs in the respiratory part of the system, especially in the alveoli. Therefore, option 3 is not a function of the conducting part. The other options describe its real roles: humidification (1), warming (2), and clearing particles (4).

🧠 Did You Know?

Cilia and mucus in the nasal passages trap dust and pathogens, helping to keep air clean before it reaches the lungs.

💡 NCERT Memory Line:

The conducting zone conditions the air; gas exchange occurs in the respiratory zone.

Question 4 of 16

🟢 NEET 2021 📘 CLASS XI

Breathing And Exchange Of Gases

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

🟢 NEET 2021 📘 CLASS XI

Breathing And Exchange Of Gases

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

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Question 6 of 16

🟢 NEET (Sept)2020 📘 CLASS XI

Breathing And Exchange Of Gases

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

AI-generated explanation. Check against your textbook.

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

🟢 NEET (Sept)2020 📘 CLASS XI

Breathing And Exchange Of Gases

Identify the wrong statement with reference to transport of oxygen.

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Question 8 of 16

🟢 NEET (Oct)2020 📘 CLASS XI

Breathing And Exchange Of Gases

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

🟢 NEET (Oct)2020 📘 CLASS XI

Breathing And Exchange Of Gases

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

🟢 NEET (Oct)2020 📘 CLASS XI

Breathing And Exchange Of Gases

According to Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health ?

AI-generated explanation. Check against your textbook.

Explanation:

PM2.5 (particulate matter with diameter 2.5 μm or less) is most harmful because it can penetrate deep into the lungs and even enter the bloodstream. According to CPCB guidelines, these tiny particles cause greater health effects than larger particles. Thus, option 2 (2.5 micrometers) is correct. Larger particles like 3.0–4.0 μm (options 1, 3, 4) are more likely to lodge in the nose or throat and are less able to reach deep lung tissues, causing comparatively milder effects.

🧠 Did You Know?

NCERT explains that finer particles, especially PM2.5, pose serious health risks, including respiratory and cardiovascular problems.

💡 NCERT Memory Line:

PM2.5 refers to particulates with diameter 2.5 μm or less, capable of reaching deep lungs and entering the bloodstream, causing greater health impacts.

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