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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Hard

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1 Hard

1 of 73

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.

2 Hard

2 of 73

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.

3 Hard

3 of 73

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.

4 Hard

4 of 73

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).

5 Hard

5 of 73

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.

6 Hard

6 of 73

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.

7 Hard

7 of 73

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

8 Hard

8 of 73

Application +4 | -1

Because of the relatively high altitude of Antonito, Colorado, the town has a normal barometric pressure of about

600 {~mm} {Hg}

rather than

760 {~mm} {Hg}

as at sea level. The partial pressure of oxygen in Antonito's air is approximately:

View answer and explanation

Correct option: B

126 {~mm} {Hg}

Option B (126 mm Hg) is correct because the partial pressure of oxygen is approximately 21% of the total barometric pressure, so 0.21 * 600 mm Hg = 126 mm Hg.

9 Hard

9 of 73

Remembering +4 | -1

Hamburger's phenomenon is also known as

View answer and explanation

Correct option: D

Chloride shift

The correct answer is D (Chloride shift) because Hamburger's phenomenon refers to the movement of chloride ions into red blood cells to maintain electrical neutrality during bicarbonate exchange.

10 Hard

10 of 73

Remembering +4 | -1

Club-shaped cartilage of larynx is

View answer and explanation

Correct option: A

cuneiform cartilage

Option A (cuneiform cartilage) is correct because the cuneiform cartilages of the larynx are club-shaped.

11 Hard

11 of 73

Remembering +4 | -1

The breakdown product of haemoglobin is called as

View answer and explanation

Correct option: B

Bilirubin

Option B (Bilirubin) is correct because bilirubin is the breakdown product of heme, a component of hemoglobin.

12 Hard

12 of 73

Remembering +4 | -1

Bicarbonates formed inside erythrocytes passes out into plasma while chloride of plasma pass into erythrocytes. The phenomenon is called

View answer and explanation

Correct option: B

Hamburger phenomenon

Option B (Hamburger phenomenon) is correct because the exchange of bicarbonate and chloride ions between erythrocytes and plasma is known as the Hamburger phenomenon or chloride shift.

13 Hard

13 of 73

Analyzing +4 | -1

Read the following statements carefully w.r.t. humans.
(a) Inspiratory capacity of a healthy adult human is about six to seven times to his tidal volume.
(b) Simple diffusion of respiratory gases through diffusion membrane is mainly based on solubility of gases but not on pressure gradients.
(c) Pressure contributed by gases in a gaseous mixture is called partial pressure of gases.
(d) The role of

\mathrm{O}_2

in the regulation of respiratory rhythm is quite insignificant.
Choose the option with only correct statements.

View answer and explanation

Correct option: D

(a) and (d)

Option C ((c) and (d)) is correct because statements (c) and (d) are the only correct statements regarding partial pressure and the role of oxygen in respiration.

14 Hard

14 of 73

Analyzing +4 | -1

Assertion (A) Bohr’s effect occurs at the level of alveoli of
lungs
Reason (R) It occurs when high concentration of

C{O_2}

decreases the affinity of haemoglobin to oxygen.

View answer and explanation

Correct option: D

If A is false, but R is true

Option D (If A is false, but R is true) is correct. Bohr's effect occurs at the tissues, not the alveoli, and is indeed caused by high CO2 concentration decreasing hemoglobin's affinity for oxygen.

15 Hard

15 of 73

Understanding +4 | -1

Partial pressure of

{O_2}

and

C{O_2}

in atmospheric airs compared to those in alveolar air is

View answer and explanation

Correct option: A

_{Higher}^{p{O_2}}\,\,\,\,_{Lower}^{pC{O_2}}

Option A (

_{Higher}^{p{O_2}}\,\,\,\,_{Lower}^{pC{O_2}}

) is correct because atmospheric air has a higher partial pressure of oxygen and a lower partial pressure of carbon dioxide compared to alveolar air.

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16 Hard

16 of 73

Remembering +4 | -1

Blood is a medium to transport

{\mathrm{O}_2}

and

\mathrm{C}{\mathrm{O}_2}

. About …A… per cent of

{\mathrm{O}_2}

is transported by …B… in the blood and the remaining …C… per cent of

{\mathrm{O}_2}

is carried in a dissolved state through the …D…
Select the right options for A, B, C and D to the complete the given statement

View answer and explanation

Correct option: B

A-97, B-RBC, C-3, D-plasma

Option B (A-97, B-RBC, C-3, D-plasma) is correct because 97% of oxygen is transported by RBCs and the remaining 3% is dissolved in plasma.

17 Hard

17 of 73

Understanding +4 | -1

Which of the following pair is correctly matched?

View answer and explanation

Correct option: C

FRC = ERV + RV

Option C (FRC = ERV + RV) is correctly matched because Functional Residual Capacity is the sum of Expiratory Reserve Volume and Residual Volume.

18 Hard

18 of 73

Remembering +4 | -1

Process of exchange of

{O_2}

from the atmosphere with …A… produced by the cells is called …B…, which is commonly known as …C…
Choose the appropriate options for the blanks A, B and C to complete the given NCERT statement

View answer and explanation

Correct option: C

A-

\mathrm{C}{\mathrm{O}_2}

, B-breathing, C-respiration

Option C (A-

\mathrm{C}{\mathrm{O}_2}

, B-breathing, C-respiration) is correct because the process involves exchanging oxygen from the atmosphere with carbon dioxide produced by cells, which is called breathing or respiration.

19 Hard

19 of 73

Understanding +4 | -1

Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of

View answer and explanation

Correct option: D

Epiglottis

Option D (Epiglottis) is correct because the epiglottis prevents food from entering the trachea during swallowing, and improper movement can lead to coughing.

20 Hard

20 of 73

Understanding +4 | -1

Assertion (A): Tidal volume is the volume of air inspired or expired with the normal breath

Reason (R): Adult person contains

500 \mathrm{~mL}

expired or inspired volumes of air with each normal breath.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because the reason correctly explains the assertion.

21 Hard

21 of 73

Remembering +4 | -1

Which animal has unpaired lungs

View answer and explanation

Correct option: D

Some snakes

Option D (Some snakes) is correct because some species of snakes have only one functional lung, while the other is reduced or absent.

22 Hard

22 of 73

Remembering +4 | -1

The state, during which the respiratory centr is inhibited, is termed as

View answer and explanation

Correct option: A

Anoxia

Option A (Anoxia) is correct because anoxia refers to a complete lack of oxygen, which would inhibit the respiratory center.

23 Hard

23 of 73

Understanding +4 | -1

Identify the correct statement with reference to transport of respiratory gases by blood?

View answer and explanation

Correct option: B

Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide

Option B (Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide) is correct because haemoglobin binds and transports oxygen, while carbonic anhydrase facilitates the conversion of carbon dioxide into bicarbonate for transport.

24 Hard

24 of 73

Understanding +4 | -1

Mark the correct statement.

(a) Alveoli are thin, irregular walled and vascularised bag like structures.

(b) Inner pleural membrane is in contact with the thoracic lining.

(c) Larynx is a cartilaginous box.

View answer and explanation

Correct option: B

(a) and (c)

Option B ((a) and (c)) is correct because alveoli are thin-walled and vascularized, and the larynx is a cartilaginous box.

25 Hard

25 of 73

Remembering +4 | -1

To balance the bicarbonate ion loss in RBC, the chloride ions move into RBC; it is known as

View answer and explanation

Correct option: D

Both 1 and 2

The correct answer is D (Both 1 and 2) because the movement of chloride ions into RBCs to balance bicarbonate loss is known as both Chloride shift and Hamburger's phenomenon.

26 Hard

26 of 73

Remembering +4 | -1

Dead space air in man is

View answer and explanation

Correct option: B

150 mL

Option B (150 mL) is correct because the dead space air in humans is approximately 150 mL.

27 Hard

27 of 73

Remembering +4 | -1

The amount of air that moves in and out of the lungs, with each normal inspiration and expiration is called

View answer and explanation

Correct option: C

Tidal volume

Option C (Tidal volume) is correct because tidal volume is defined as the volume of air inhaled or exhaled during normal breathing.

28 Hard

28 of 73

Understanding +4 | -1

Assertion: The passage starting with the external nostrils upto the terminal bronchiole constitute the respiratory part.
Reason: The respiratory part transport the air to the alveoli, clears it from the foreign material, humidified and brings the air to body temperature.

View answer and explanation

Correct option: D

If both Assertion and Reason are false statements

Option D (If both Assertion and Reason are false statements) is correct because the respiratory part starts with the respiratory bronchioles and alveoli, not the external nostrils, and the reason incorrectly describes the function of the conducting part.

29 Hard

29 of 73

Application +4 | -1

If a healthy adult man inspires or expires 9000 mL of air per minute, then what will be his breathing rate per minute assuming his tidal volume remains normal?

View answer and explanation

Correct option: C

18 times

Option C (18 times) is correct because the breathing rate is calculated by dividing the minute volume by the normal tidal volume.

30 Hard

30 of 73

Understanding +4 | -1

Total lung capacity is

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because total lung capacity can be defined in all the given ways.

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 73 single-correct-answer MCQs on BREATHING AND EXCHANGE OF GASES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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