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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Mixed difficulty

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Showing 1-30 of 303 questions

1 Medium

1 of 303

Understanding +4 | -1

External gills, tracheae, and lungs all share which of the following sets of characteristics?

View answer and explanation

Correct option: A

Part of gas-exchange system, exchange both

C{O_2}

and

{O_2}

; increase surface area for diffusion.

Option A (Part of gas-exchange system, exchange both

CO_2

and

{O_2}

; increase surface area for diffusion) is correct because all three structures facilitate gas exchange, exchanging both oxygen and carbon dioxide, and increase surface area for efficient diffusion.

2 Hard

2 of 303

Understanding +4 | -1

A person suffers punctures in his chest cavity in an accident, without any damage to the lungs its effect could be

View answer and explanation

Correct option: D

Cessation of breathing

Option D (Cessation of breathing) is correct because punctures in the chest cavity can lead to lung collapse, preventing breathing.

3 Easy

3 of 303

Remembering +4 | -1

Among vertebrates, …A… use gills whereas reptiles, birds and mammals respire through the …B… . Amphibians like frogs can respire through …C… also. Mammals have a well adapted respiratory system
Select appropriate choice for the blanks A, B and C to complete the given NCERT statement

View answer and explanation

Correct option: C

A-fishes, B-lungs, C-moist skin

Option C (A-fishes, B-lungs, C-moist skin) is correct because fishes use gills, reptiles, birds, and mammals use lungs, and amphibians like frogs can respire through moist skin.

4 Easy

4 of 303

Remembering +4 | -1

The largest quantity of air that can be expired after a maximum inspiratory effort is

View answer and explanation

Correct option: C

Vital capacity of lung

Option C (Vital capacity of lung) is correct because vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation.

5 Medium

5 of 303

Analyzing +4 | -1

Assertion : Most fish when out of water, die of
suffocation.

Reason : Atmospheric air contains far less
oxygen content than the dissolved oxygen in
water.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

The correct answer is C (Assertion is true but Reason is false) because fish die of suffocation out of water, but the reason is that their gills collapse and cannot extract oxygen from the air, not because of lower oxygen content.

6 Hard

6 of 303

Understanding +4 | -1

The faster breathing in high fever is due to the

View answer and explanation

Correct option: B

high temperature of the body

Option B (high temperature of the body) is correct because increased body temperature increases metabolic rate, leading to a higher demand for oxygen and thus faster breathing.

7 Medium

7 of 303

Remembering +4 | -1

Symptoms of altitude sickness except

View answer and explanation

Correct option: A

High amount of oxygen

Option A (High amount of oxygen) is correct because altitude sickness is caused by a lack of oxygen, not an excess.

8 Easy

8 of 303

Remembering +4 | -1

Friction on the lungs surface reduces by

View answer and explanation

Correct option: A

Double layered pleura

Option A (Double layered pleura) is correct because the pleural fluid between the two layers of the pleura reduces friction during breathing.

9 Hard

9 of 303

Remembering +4 | -1

Match the following
A) Emphysema - i ) cigarette smoking
B) Asthma - ii) inflammation of bronchi
C) Pneumotaxic centre - iii) in the pons region
D) Occupational respiratory disorders - iv) silicosis

View answer and explanation

Correct option: D

1- i 2 – ii 3 – iii 4 – iv

Option D (1- i 2 – ii 3 – iii 4 – iv) is correct because it correctly matches each respiratory condition/center with its associated cause/location.

10 Easy

10 of 303

Understanding +4 | -1

{O_2}

exchange with

C{O_2}

by simple diffusion over the entire body surface takes place in
I. sponges II. Coelenterates III. Flatworms
Select the correct option to complete the given statement

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because sponges, coelenterates, and flatworms all exchange oxygen and carbon dioxide through simple diffusion across their entire body surface.

11 Hard

11 of 303

Understanding +4 | -1

Sudden pressure loss on a diver's body while coming up from the deeper part of the sea causes a sickness which is due to the

View answer and explanation

Correct option: C

Nitrogen bubbles in the blood

Option C (Nitrogen bubbles in the blood) is correct because rapid decompression causes dissolved nitrogen to form bubbles, leading to decompression sickness (the bends).

12 Easy

12 of 303

Understanding +4 | -1

A chemo sensitive area is situated adjacent to the rhythm centre which is highly sensitive to increase in there substances can activate this centre

View answer and explanation

Correct option: D

both A and B

Option D (both A and B) is correct because the chemosensitive area adjacent to the rhythm center is highly sensitive to increases in both carbon dioxide and hydrogen ions.

13 Easy

13 of 303

Remembering +4 | -1

How many layers are present in the diffusion membrane of alveolus capillary?

View answer and explanation

Correct option: B

Option B (3) is correct because the diffusion membrane of the alveolus-capillary unit consists of three layers: the alveolar epithelium, the capillary endothelium, and their fused basement membrane.

14 Medium

14 of 303

Understanding +4 | -1

\rho C{O_2}

is higher in tissues due to

View answer and explanation

Correct option: B

Catabolism

Option B (Catabolism) is correct because catabolic processes break down complex molecules, releasing carbon dioxide as a byproduct, leading to a higher partial pressure of CO2 in tissues.

15 Medium

15 of 303

Analyzing +4 | -1

Emphysema damages the tissues of the lungs and slows pulmonary blood flow. This causes blood to back up, stretching and weakening the walls of the heart and blood vessels. Which of the following do you think would be most affected by this backup of blood from the lungs?

View answer and explanation

Correct option: D

Right ventricle

Option D (Right ventricle) is correct because the right ventricle pumps blood to the lungs, so backflow from damaged lungs will directly affect it.

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16 Medium

16 of 303

Remembering +4 | -1

During inspiration the diaphragm:

View answer and explanation

Correct option: B

Contracts and flattens

Option B (Contracts and flattens) is correct because during inspiration, the diaphragm contracts and moves downward, causing it to flatten.

17 Easy

17 of 303

Remembering +4 | -1

A fully grown tadpole larva of respires through

View answer and explanation

Correct option: B

Gills

Option B (Gills) is correct because tadpoles are aquatic larvae and respire using gills, similar to fish.

18 Easy

18 of 303

Understanding +4 | -1

Exchange of

{O_2}

and

C{O_2}

between the blood and tissue is based on

View answer and explanation

Correct option: A

Pressure/concentration gradient

Option A (Pressure/concentration gradient) is correct because the exchange of oxygen and carbon dioxide between blood and tissues is driven by differences in their partial pressures or concentrations.

19 Hard

19 of 303

Understanding +4 | -1

During transport of

C{O_2},

blood does not become acidic due to

View answer and explanation

Correct option: C

Blood buffers

Option C (Blood buffers) is correct because blood buffers, such as bicarbonate, phosphate, and proteins, help maintain a stable pH by neutralizing excess acids or bases.

20 Hard

20 of 303

Analyzing +4 | -1

During winter a person died during sleep, the room was closed and a container with burnt charcoal was found in the room. What may be the possible reason of this death?

View answer and explanation

Correct option: B

Hb has more affinity to combine with carbon monoxide

Option B (Hb has more affinity to combine with carbon monoxide) is correct because carbon monoxide has a much higher affinity for hemoglobin than oxygen, leading to carbon monoxide poisoning.

21 Medium

21 of 303

Remembering +4 | -1

Air entering the lungs is

View answer and explanation

Correct option: A

Warm and filtered

The correct answer is A (Warm and filtered) because the nasal cavity and upper respiratory tract warm and filter the air before it reaches the lungs.

22 Medium

22 of 303

Remembering +4 | -1

The respiratory Centre which regulates respiration is located in

View answer and explanation

Correct option: B

Medulla oblongata

Option B (Medulla oblongata) is correct because the respiratory center that regulates respiration is located in the medulla oblongata.

23 Medium

23 of 303

Remembering +4 | -1

When vital capacity is added to residual volume it is:

View answer and explanation

Correct option: A

Total lung capacity

Option A (Total lung capacity) is correct because total lung capacity is the sum of vital capacity and residual volume.

24 Medium

24 of 303

Analyzing +4 | -1

Assertion. The role of oxygen in the regulation of respiratory rhythm is quite insignificant.

Reason: Increased

PC{O_2}

and

{H^ + }

concentration inputs from chemoreceptors can activate respiratory rhythm centre to make necessary adjustments.

View answer and explanation

Correct option: A

Both assertion and reason are true and reason is the correct explanation of assertion

Option A (Both assertion and reason are true and reason is the correct explanation of assertion) is correct because oxygen plays a minor role in regulating respiratory rhythm, while increased

PC{O_2}

and

{H^ + }

concentration stimulate chemoreceptors to adjust breathing.

25 Easy

25 of 303

Remembering +4 | -1

Actual site of exchange of gases in the lungs is

View answer and explanation

Correct option: A

Alveoli

Option A (Alveoli) is correct because alveoli are the tiny air sacs in the lungs where gas exchange with the blood occurs.

26 Medium

26 of 303

Remembering +4 | -1

The maximum amount of air, a person can inhale after forced expiration is known as

View answer and explanation

Correct option: B

vital capacity

Option B (vital capacity) is correct because vital capacity is the maximum amount of air a person can inhale after a forced expiration.

27 Easy

27 of 303

Analyzing +4 | -1

Choose the incorrect match in the following.

View answer and explanation

Correct option: C

Total lung capacity = VC — TV

Option C (Total lung capacity = VC — TV) is the incorrect match because Total Lung Capacity (TLC) is the sum of Vital Capacity (VC) and Residual Volume (RV), or TLC = VC + RV.

28 Hard

28 of 303

Understanding +4 | -1

Following is the correct order of diffusion rate of oxygen, carbon dioxide and nitrogen from lungs to blood through the respiratory membrane

View answer and explanation

Correct option: A

C{O_2} > {O_2} > {N_2}

Option A (

CO_2 > O_2 > N_2

) is correct because the diffusion rate is proportional to the solubility of the gas, and

CO_2

is much more soluble than

O_2

and

N_2

29 Easy

29 of 303

Understanding +4 | -1

Low

{pO}_2

, high

{pCO}_2

, high

{H}^{+}

and high temperature are the conditions favourable for

View answer and explanation

Correct option: C

Dissociation of

{O}_2

from oxyhaemoglobin in body tissues

Option C (Dissociation of

{O}_2

from oxyhaemoglobin in body tissues) is correct because low oxygen, high carbon dioxide, high acidity (H+), and high temperature are conditions found in metabolically active tissues, promoting oxygen release from hemoglobin.

30 Easy

30 of 303

Remembering +4 | -1

During expiration, the diaphragm becomes

View answer and explanation

Correct option: C

Dome-shaped

Option C (Dome-shaped) is correct because during expiration, the diaphragm relaxes and returns to its dome-shaped position.

Revision notes and key takeaways

Review BREATHING AND EXCHANGE OF GASES in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 303 single-correct-answer MCQs on BREATHING AND EXCHANGE OF GASES.
✓ Try each question before opening its answer. Read the explanation where one is available.
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