The solubility of ${{\rm{C}}{{\rm{O}}_2}}$ in the blood is

10-15 times higher than that of ${O_2}$

Slightly higher than that of ${O_2}$

Slightly lower than that of ${O_2}$

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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Easy

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31 Easy

31 of 104

Understanding +4 | -1

The volume of air that remains in lungs even after forcible expiration, equals to

View answer and explanation

Correct option: A

TLC – VC

Option A (TLC – VC) is correct because the volume of air remaining in the lungs after forcible expiration is the residual volume, and RV = TLC - VC.

32 Easy

32 of 104

Understanding +4 | -1

Movement of the air into and out of the lungs is carried out by

View answer and explanation

Correct option: B

Pressure gradient

Option B (Pressure gradient) is correct because the movement of air into and out of the lungs is driven by differences in pressure between the atmosphere and the lungs.

33 Easy

33 of 104

Analyzing +4 | -1

Assertion – in insects direct respiration is occur.
Reason : Tracheal tubes exchange

{O_2}/C{O_2}

directly with the haemocoel which then exchange with tissues

View answer and explanation

Correct option: A

If both assertion and reason are true and the reason is the correct explanation of the assertion

Option A (If both assertion and reason are true and the reason is the correct explanation of the assertion) is correct because insects use a direct respiratory system where tracheal tubes deliver oxygen directly to tissues from the haemocoel.

34 Easy

34 of 104

Remembering +4 | -1

The total thickness of the diffusion membrane of alveolus capillary is

View answer and explanation

Correct option: C

Less than 1 mm

Option C (Less than 1 mm) is correct because the diffusion membrane of the alveolus capillary is very thin to facilitate gas exchange.

35 Easy

35 of 104

Remembering +4 | -1

How many of the following are associated with the harmful effect of smoking? Bronchitis, Emphysema, Coronary heart disease, Cancer of lung, Cancer of urinary bladder, Gastric ulcer

View answer and explanation

Correct option: A

Six

Option A (Six) is correct because all the listed conditions are associated with the harmful effects of smoking.

36 Easy

36 of 104

Remembering +4 | -1

The structure which prevents the entry of food into respiratory tract is

View answer and explanation

Correct option: C

Epiglottis

The correct answer is C (Epiglottis) because the epiglottis is a flap of cartilage that covers the trachea during swallowing to prevent food from entering the respiratory tract.

37 Easy

37 of 104

Understanding +4 | -1

Chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased

View answer and explanation

Correct option: D

emphysema

Option D (emphysema) is correct because emphysema is characterized by the destruction of alveolar walls, leading to a decreased respiratory surface.

38 Easy

38 of 104

Remembering +4 | -1

The solubility of

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

in the blood is

View answer and explanation

Correct option: B

20-25 times higher than that of

{O_2}

Option B (20-25 times higher than that of

{O_2}

) is correct because CO2 is much more soluble in blood than oxygen due to its ability to react with water to form carbonic acid.

39 Easy

39 of 104

Understanding +4 | -1

Why do human beings face difficulty to breath in high elevations?

View answer and explanation

Correct option: D

Low

\rho {\mathrm{O}_2}

Option D (Low

\rho {\mathrm{O}_2}

) is correct because at high elevations, the density of oxygen is lower, making it difficult to breathe.

40 Easy

40 of 104

Remembering +4 | -1

After a deep inspiration and maximum expiration, the capacity of lungs is known as

View answer and explanation

Correct option: A

Vital capacity

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

41 Easy

41 of 104

Remembering +4 | -1

A chemosensitive area is situated adjacent to the rhythm centre in the brain. This area is highly sensitive to

View answer and explanation

Correct option: D

Both (1) and (3 )

Option D (Both (1) and (3)) is correct because the chemosensitive area near the rhythm center is highly sensitive to both CO2 and H+ concentrations.

42 Easy

42 of 104

Understanding +4 | -1

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

View answer and explanation

Correct option: A

Provides surface for diffusion of

{O_2}

and

C{O_2}

Option A (Provides surface for diffusion of

{O_2}

and

C{O_2}

) is correct because the conducting part does not participate in gas exchange; that is the function of the respiratory part (alveoli).

43 Easy

43 of 104

Understanding +4 | -1

In humans, exchange of gases occurs

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because gas exchange occurs in the lungs via diffusion, and between blood and tissues.

44 Easy

44 of 104

Remembering +4 | -1

About 1200 mL of air is always known to remain inside the human lungs. It is described as

View answer and explanation

Correct option: C

Residual volume

Option C (Residual volume) is correct because residual volume is the volume of air that always remains in the lungs.

45 Easy

45 of 104

Remembering +4 | -1

One of the major cause of emphysema is

View answer and explanation

Correct option: C

Cigarette smoking

Option C (Cigarette smoking) is correct because it is the primary cause of emphysema due to the destruction of alveolar walls.

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46 Easy

46 of 104

Remembering +4 | -1

Haemoglobin is the red coloured iron containing pigment which is present in

View answer and explanation

Correct option: B

RBC

Option B (RBC) is correct because hemoglobin is located within red blood cells.

47 Easy

47 of 104

Understanding +4 | -1

Arrange the following in order of increasing volume

(A) Tidal volume

(B) Residual volume

(C) Expiratory reserve volume

(D) Vital capacity Options :

View answer and explanation

Correct option: B

D, B, C, A

Option D (C, B, D, A) is correct because it arranges the volumes in ascending order: Expiratory reserve volume < Residual volume < Tidal volume < Vital capacity.

48 Easy

48 of 104

Remembering +4 | -1

Asthama is caused by

View answer and explanation

Correct option: D

Spasm in the bronchioles and bronchi

Option D (Spasm in the bronchioles and bronchi) is correct because asthma is characterized by the constriction and inflammation of these airways, leading to breathing difficulties.

49 Easy

49 of 104

Remembering +4 | -1

Oxygen dissociation curve is

View answer and explanation

Correct option: A

Sigmoid

Option A (Sigmoid) is correct because the oxygen dissociation curve is S-shaped due to the cooperative binding of oxygen to hemoglobin.

50 Easy

50 of 104

Remembering +4 | -1

Which portion of the human respiratory system is called sound box?

View answer and explanation

Correct option: A

Larynx

The correct answer is A (Larynx) because the larynx contains the vocal cords, which vibrate to produce sound.

51 Easy

51 of 104

Remembering +4 | -1

Intercostal muscles occur in

View answer and explanation

Correct option: D

Ribs

Option D (Ribs) is correct because intercostal muscles are located between the ribs and play a crucial role in breathing.

52 Easy

52 of 104

Understanding +4 | -1

Mechanism of breathing vary among different group of animals depending mainly on the
A) Habits B) Habitats
C) Levels of organization D) Demand of situation

View answer and explanation

Correct option: B

B and C

Option B (B and C) is correct because the mechanism of breathing varies depending on the animal's habitat and level of organization.

53 Easy

53 of 104

Remembering +4 | -1

Lungs have a large number of narrow tubes called

View answer and explanation

Correct option: C

Bronchioles

Option C (Bronchioles) is correct because bronchioles are the narrow tubes within the lungs that branch from the bronchi.

54 Easy

54 of 104

Analyzing +4 | -1

Assertion : Symptoms of emphysema develops when a person living on plains ascends and stays on a mountain.

Reason : Air pressure and partial pressure of oxygen falls with the rise in altitude.

View answer and explanation

Correct option: D

If the assertion is false but reason is true

Option D (If the assertion is false but reason is true) is correct because emphysema is a chronic condition that develops over time, not suddenly upon ascending a mountain, but the reason about air pressure and partial pressure of oxygen is correct.

55 Easy

55 of 104

Understanding +4 | -1

In humans, the contraction of which of the following muscle causes an increase in the volume of thoracic chamber in dorso-ventral axis?

View answer and explanation

Correct option: C

External intercostal muscles

Option C (External intercostal muscles) is correct because contraction of the external intercostal muscles elevates the rib cage, increasing the thoracic volume in the dorso-ventral axis.

56 Easy

56 of 104

Understanding +4 | -1

What is vital capacity of our lungs ?

View answer and explanation

Correct option: D

total lung capacity – residual volume

Option D (total lung capacity – residual volume) is correct because vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation, which is the total lung capacity minus the air that always remains (residual volume).

57 Easy

57 of 104

Understanding +4 | -1

Which of the following statement is true regarding the human respiratory system?

View answer and explanation

Correct option: A

Tracheal rings are of hyaline cartilage

Option A (Tracheal rings are of hyaline cartilage) is correct because the tracheal rings are indeed made of hyaline cartilage.

58 Easy

58 of 104

Application +4 | -1

Given that tidal volume is

600 \mathrm{ml}

, inspiratory reserve volume is

2500 \mathrm{ml}

, and expiratory reserve volume is

800 \mathrm{ml}

, what is the value of vital capacity of lung?

View answer and explanation

Correct option: A

3900 \mathrm{~ml}

Option A (3900 ml) is correct because vital capacity is the sum of tidal volume, inspiratory reserve volume, and expiratory reserve volume:

VC = TV + IRV + ERV

59 Easy

59 of 104

Understanding +4 | -1

Which of the following feature is common in the alveoli of lungs and villi of mammals?

View answer and explanation

Correct option: A

provide a large surface area

Option A (provide a large surface area) is correct because both alveoli in the lungs and villi in the small intestine are highly folded structures that increase the surface area for efficient exchange.

60 Easy

60 of 104

Understanding +4 | -1

Identify the component of respiratory system which displays the features given below and choose the correct option
I. Double layered
II. Fluid contained in it reduces the friction on the lung surface
III. Its outer layer is in contact with thoracic wall
IV. Its inner layer is in contact with lungs

View answer and explanation

Correct option: D

Pleura

Option D (Pleura) is correct because the pleura is a double-layered membrane with fluid that reduces friction and has layers in contact with the thoracic wall and lungs.

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.

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