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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Easy

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Showing 1-30 of 104 questions

1 Easy

1 of 104

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.

2 Easy

2 of 104

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.

3 Easy

3 of 104

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.

4 Easy

4 of 104

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.

5 Easy

5 of 104

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

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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.

6 Easy

6 of 104

Remembering +4 | -1

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

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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.

7 Easy

7 of 104

Remembering +4 | -1

A fully grown tadpole larva of respires through

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Correct option: B

Gills

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

8 Easy

8 of 104

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.

9 Easy

9 of 104

Remembering +4 | -1

Actual site of exchange of gases in the lungs is

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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.

10 Easy

10 of 104

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.

11 Easy

11 of 104

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.

12 Easy

12 of 104

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.

13 Easy

13 of 104

Remembering +4 | -1

The partial pressure of oxygen in the alveolar air is

View answer and explanation

Correct option: C

104 mm Hg

Option C (104 mm Hg) is correct because the partial pressure of oxygen in the alveolar air is approximately 104 mm Hg.

14 Easy

14 of 104

Remembering +4 | -1

Which one respires through gills?

View answer and explanation

Correct option: D

Scoliodon

Option D (Scoliodon) is correct because Scoliodon (dogfish shark) respires through gills, being an aquatic animal.

15 Easy

15 of 104

Understanding +4 | -1

We already know that mechanism of breathing vary among different groups of animals depending mainly on their habitats and level of organisation. Then read the above statement carefully and choose correct mode of respiration from below :
(A) Branchial respiration
(B) Pulmonary respiration
(C) Cutaneous respiration

View answer and explanation

Correct option: A

A–Gills, B–Lungs, C–Moist skin

Option A (A–Gills, B–Lungs, C–Moist skin) is correct because it correctly matches the mode of respiration with the respiratory organ.

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16 Easy

16 of 104

Remembering +4 | -1

Skin is an accessory organ of respiration

View answer and explanation

Correct option: C

Frog

Option C (Frog) is correct because frogs use their skin as an accessory respiratory organ, especially when in water, in addition to their lungs.

17 Easy

17 of 104

Understanding +4 | -1

Mark the incorrect option w.r.t respiratory capacities

View answer and explanation

Correct option: B

VC=IRV+ERV

Option D (VC=IRV+ERV) is incorrect because Vital Capacity (VC) is equal to IRV + ERV + TV.

18 Easy

18 of 104

Remembering +4 | -1

Pleural membrane is covering of

View answer and explanation

Correct option: B

Lung

The correct answer is B (Lung) because the pleural membrane is a protective covering of the lungs.

19 Easy

19 of 104

Understanding +4 | -1

Lungs in addition to the respiratory function also help in

View answer and explanation

Correct option: C

{P^H}

regulation

Option C (

{P^H}

regulation) is correct because the lungs help regulate blood pH by controlling carbon dioxide levels.

20 Easy

20 of 104

Remembering +4 | -1

Name the disease which occurs due to inflammation of bronchi and bronchioles in which breathing becomes difficult and leads to wheezing

View answer and explanation

Correct option: B

Asthma

Option B (Asthma) is correct because it is characterized by inflammation of bronchi and bronchioles, leading to breathing difficulties and wheezing.

21 Easy

21 of 104

Remembering +4 | -1

At which thoracic vertebra does trachea divide into right and left primary bronchi?

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Correct option: A

Option A (5) is correct because the trachea divides into the right and left primary bronchi at the level of the 5th thoracic vertebra.

22 Easy

22 of 104

Understanding +4 | -1

Cellular respiration depends upon the

View answer and explanation

Correct option: D

Transport

{O_2}

the cells

Option D (Transport

{O_2}

the cells) is correct because cellular respiration requires a continuous supply of oxygen to the cells.

23 Easy

23 of 104

Understanding +4 | -1

Which of the following gas is quite insignificant for the regulation of respiration rhythm?

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Correct option: D

{O_2}

Option B (

{N_2}

) is correct because nitrogen is an inert gas and does not directly participate in the regulation of respiration rhythm.

24 Easy

24 of 104

Analyzing +4 | -1

Select the incorrect match w.r.t. humans

View answer and explanation

Correct option: B

Volume of air remaining in the lungs even after a forcible expiration – 1000 – 1100 mL

The incorrect match is B (Volume of air remaining in the lungs even after a forcible expiration – 1000 – 1100 mL) because the residual volume is actually around 1100-1200 mL.

25 Easy

25 of 104

Understanding +4 | -1

Air is breath through

View answer and explanation

Correct option: C

Nostrils – Pharynx – Larynx – Trachea – Bronchi – Bronchioles – alveoli

Option C (Nostrils – Pharynx – Larynx – Trachea – Bronchi – Bronchioles – alveoli) is correct because it represents the correct sequence of air passage during breathing.

26 Easy

26 of 104

Understanding +4 | -1

What are the favourable conditions for oxyhaemoglobin?

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Correct option: D

All of these

Option D (All of these) is correct because high partial pressure of oxygen, low partial pressure of carbon dioxide, and low hydrogen ion concentration (high pH) all favor the formation of oxyhemoglobin.

27 Easy

27 of 104

Understanding +4 | -1

Fish brought out of water dies of

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Correct option: C

inability to respire

Option C (inability to respire) is correct because fish rely on gills to extract oxygen from water, and they cannot efficiently obtain oxygen from the air.

28 Easy

28 of 104

Understanding +4 | -1

Which of the following respiratory capacity includes residual volume?

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Correct option: A

TLC

Option A (TLC) is correct because Total Lung Capacity (TLC) includes the residual volume.

29 Easy

29 of 104

Remembering +4 | -1

In expiration, diaphragm becomes

View answer and explanation

Correct option: D

dome shape

Option D (dome shape) is correct because during expiration, the diaphragm relaxes and returns to its dome shape.

30 Easy

30 of 104

Remembering +4 | -1

Which of the following parts are involved in the mechanism of breathing?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because abdominal muscles, diaphragm, and intercostal muscles all play a role in the mechanism of breathing.

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 104 single-correct-answer MCQs on BREATHING AND EXCHANGE OF GASES.
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