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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Medium

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Showing 1-30 of 126 questions

1 Medium

1 of 126

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 Medium

2 of 126

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.

3 Medium

3 of 126

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.

4 Medium

4 of 126

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.

5 Medium

5 of 126

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.

6 Medium

6 of 126

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.

7 Medium

7 of 126

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.

8 Medium

8 of 126

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.

9 Medium

9 of 126

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.

10 Medium

10 of 126

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.

11 Medium

11 of 126

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.

12 Medium

12 of 126

Understanding +4 | -1

Which structure of man is similar to spiracle of cockroach?

View answer and explanation

Correct option: A

Nostril

Option A (Nostril) is correct because the nostril is the external opening for air intake in humans, similar to the spiracle in cockroaches.

13 Medium

13 of 126

Remembering +4 | -1

Respiratory rhythm centre is located in

View answer and explanation

Correct option: B

Medulla

Option B (Medulla) is correct because the respiratory rhythm center, responsible for controlling the basic rhythm of breathing, is located in the medulla oblongata.

14 Medium

14 of 126

Remembering +4 | -1

The type of respiration found in most of the aquatic arthropods and molluscs is

View answer and explanation

Correct option: B

Branchial respiration

Option B (Branchial respiration) is correct because aquatic arthropods and molluscs primarily use gills for gas exchange.

15 Medium

15 of 126

Understanding +4 | -1

Almost same

\rho C{O_2}

in humans is found in

View answer and explanation

Correct option: C

Deoxygenated blood and tissues

Option C (Deoxygenated blood and tissues) is correct because deoxygenated blood returning to the lungs and tissues where cellular respiration occurs have relatively high and similar partial pressures of CO2.

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16 Medium

16 of 126

Remembering +4 | -1

Leftward shift of oxyhaemoglobin curve is noticed under

View answer and explanation

Correct option: D

Low temperature and high pH

Option D (Low temperature and high pH) is correct because these conditions increase hemoglobin's affinity for oxygen, shifting the curve to the left.

17 Medium

17 of 126

Understanding +4 | -1

Select the correct match w.r.t animals and their respiratory structures.

View answer and explanation

Correct option: D

Frogs – Lungs

The correct match is D (Frogs – Lungs) because frogs use lungs for respiration, especially on land.

18 Medium

18 of 126

Remembering +4 | -1

Which substances are activate the rhythm centre

View answer and explanation

Correct option: B

C{O_2}

and

{H^ + }

Option B (

C{O_2}

and

{H^ + }

) is correct because increased levels of carbon dioxide and hydrogen ions stimulate the respiratory rhythm center in the brain.

19 Medium

19 of 126

Understanding +4 | -1

Choose the odd one w.r.t. formation of oxyhaemoglobin.

View answer and explanation

Correct option: C

Higher

H^ +

concentration

Option C (Higher

H^+

concentration) is the odd one out because high

H^+

concentration, low pH, disfavors the formation of oxyhaemoglobin.

20 Medium

20 of 126

Understanding +4 | -1

Which fact suggests that most oxygen is transported from lungs to the tissues combined with haemoglobin rather than dissolved in blood plasma?

View answer and explanation

Correct option: A

Oxygen carrying capacity of whole blood is much higher than that of plasma and oxygen content of blood leaving the lungs is greater than that of blood entering the lungs

Option A is correct because the oxygen carrying capacity of whole blood is significantly higher than plasma, indicating hemoglobin's crucial role in oxygen transport.

21 Medium

21 of 126

Understanding +4 | -1

Which of the following increases the rate of gas exchange across the respiratory membrane

View answer and explanation

Correct option: C

Increased surface area of the respiratory membrane

Option C (Increased surface area of the respiratory membrane) is correct because a larger surface area provides more space for gas exchange to occur.

22 Medium

22 of 126

Understanding +4 | -1

Expiration during quiet breathing

View answer and explanation

Correct option: D

Occurs when the external inter coastal muscles relax

Option D (Occurs when the external inter coastal muscles relax) is correct because during quiet breathing, expiration is a passive process resulting from the relaxation of inspiratory muscles.

23 Medium

23 of 126

Analyzing +4 | -1

Patients with chronic lung disease and difficulty breathing often adapt to the high concentration of

{CO}_2

in their blood. The breathing centres stop responding to

{CO}_2

level. If such a patient has difficulty in breathing, medical personnel are reluctant to give the patient pure oxygen. Based on what you know about control of breathing, why do you think this is the case?

View answer and explanation

Correct option: C

Increased oxygen in the blood might slow or stop breathing.

Option C (Increased oxygen in the blood might slow or stop breathing) is correct because in chronically hypercapnic patients, the respiratory drive is primarily dependent on hypoxia, and administering pure oxygen can remove this drive.

24 Medium

24 of 126

Remembering +4 | -1

Primary sites of exchange of gases are:

View answer and explanation

Correct option: A

Alveoli

Option A (Alveoli) is correct because alveoli are the primary sites of gas exchange between air and blood in the lungs.

25 Medium

25 of 126

Understanding +4 | -1

During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because

View answer and explanation

Correct option: C

{O_2}

tension is low and

C{O_2}

tension is high

Option C (

{O_2}

tension is low and

C{O_2}

tension is high) is correct because these conditions promote the dissociation of oxygen from hemoglobin at the tissue level.

26 Medium

26 of 126

Remembering +4 | -1

Which of the following combines irreversibly with blood haemoglobin?

View answer and explanation

Correct option: C

Option C (CO) is correct because carbon monoxide binds to hemoglobin with a much higher affinity than oxygen, forming a stable compound and preventing oxygen transport.

27 Medium

27 of 126

Analyzing +4 | -1

Select the mismatch among the following.

View answer and explanation

Correct option: C

pCO_2

in tissues – 40 mm Hg

Option C (

pCO_2

in tissues – 40 mm Hg) is the mismatch because the partial pressure of

CO_2

in tissues is higher than 40 mm Hg.

28 Medium

28 of 126

Remembering +4 | -1

Carbonic Anhydrase occurs in

View answer and explanation

Correct option: C

RBC

Option C (RBC) is correct because carbonic anhydrase, the enzyme that catalyzes the conversion of carbon dioxide and water to carbonic acid, is primarily found in red blood cells.

29 Medium

29 of 126

Remembering +4 | -1

Moist cuticle is the respiratory organ in

View answer and explanation

Correct option: B

Earthworms

Option B (Earthworms) is correct because earthworms use their moist skin (cuticle) for gas exchange.

30 Medium

30 of 126

Analyzing +4 | -1

Statement-I: If two men, expire the same volume of air after normal inspiration, they have the same expiratory capacity.

Statement-II: Expiratory capacity includes tidal volume and inspiratory reserve volume.

View answer and explanation

Correct option: B

Statement I is correct but Statement II is wrong.

Option B (Statement I is correct but Statement II is wrong) is correct because expiratory capacity depends on the volume of air expired, and expiratory capacity includes tidal volume and expiratory reserve volume, not inspiratory reserve volume.

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 126 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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