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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Mixed difficulty

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121 Easy

121 of 303

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.

122 Medium

122 of 303

Understanding +4 | -1

Pneumotaxic centre of the brain can

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Correct option: A

Moderate the function of respiratory system

Option A (Moderate the function of respiratory system) is correct because the pneumotaxic center primarily regulates the rate and depth of breathing.

123 Hard

123 of 303

Remembering +4 | -1

Respiration is an

View answer and explanation

Correct option: B

Exothermic process

Option B (Exothermic process) is correct because respiration involves the breakdown of glucose to release energy, which is an exothermic reaction.

124 Medium

124 of 303

Understanding +4 | -1

For air flow into or out of the lungs there must be

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Correct option: C

A pressure gradient established between the atmosphere and the alveoli

Option C (A pressure gradient established between the atmosphere and the alveoli) is correct because air flow is driven by pressure differences.

125 Medium

125 of 303

Remembering +4 | -1

Cellular respiration is a/an _____ process

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Correct option: A

Catabolic

Option A (Catabolic) is correct because cellular respiration involves the breakdown of complex molecules into simpler ones, releasing energy.

126 Hard

126 of 303

Understanding +4 | -1

A spirometer cannot be used to measure

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Correct option: B

Option B (RV) is correct because spirometers cannot measure residual volume, as it's the air remaining after maximal exhalation and can't be directly exhaled into the device.

127 Easy

127 of 303

Remembering +4 | -1

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

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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.

128 Easy

128 of 303

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).

129 Medium

129 of 303

Remembering +4 | -1

Partial pressures of oxygen and carbon dioxide in alveoli of healthy human being are, nearest to

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Correct option: C

40 and 45 mm Hg

Option A (104 and 40 mm Hg) is correct because the partial pressure of oxygen in the alveoli is approximately 104 mm Hg, and the partial pressure of carbon dioxide is approximately 40 mm Hg.

130 Easy

130 of 303

Understanding +4 | -1

In humans, exchange of gases occurs

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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.

131 Medium

131 of 303

Remembering +4 | -1

Volume of air breathed in and out, while at rest is called

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Correct option: B

Tidal volume

Option B (Tidal volume) is correct because tidal volume is the volume of air breathed in and out during rest.

132 Hard

132 of 303

Understanding +4 | -1

Factors affecting the rate of diffusion is/are

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Correct option: D

All of these

Option D (All of these) is correct because the rate of diffusion is affected by the pressure gradient, solubility of gases, and thickness of membranes.

133 Easy

133 of 303

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.

134 Easy

134 of 303

Remembering +4 | -1

One of the major cause of emphysema is

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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.

135 Easy

135 of 303

Remembering +4 | -1

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

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Correct option: B

RBC

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

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136 Medium

136 of 303

Remembering +4 | -1

Functional residual capacity in human is the amount of air

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Correct option: C

That remains in the lungs after normal expiration.

Option C (That remains in the lungs after normal expiration) is correct because functional residual capacity (FRC) is the volume of air remaining in the lungs after a normal, passive exhalation.

137 Medium

137 of 303

Understanding +4 | -1

Given below is a list of some structures of human respiratory system in a box. Primary bronchi, Trachea, Terminal bronchiole, Respiratory bronchiole
How many of them do not possess incomplete cartilaginous rings?

View answer and explanation

Correct option: B

Option B (2) is correct because the terminal and respiratory bronchioles do not possess incomplete cartilaginous rings.

138 Medium

138 of 303

Analyzing +4 | -1

Assertion (A)

C{O_2}

transport occurs very fast through RBCs.
Reason (R) Enzyme carbonic anhydrase is absent in the
blood plasma

View answer and explanation

Correct option: C

If A is true, but R is false

Option C (If A is true, but R is false) is correct because CO2 transport is rapid in RBCs due to carbonic anhydrase, but the enzyme *is* present in blood plasma, though in smaller amounts.

139 Easy

139 of 303

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.

140 Hard

140 of 303

Remembering +4 | -1

Stretch receptors of bronchi send information to inspiratory centre through

View answer and explanation

Correct option: A

Vagus nerve

Option A (Vagus nerve) is correct because stretch receptors in the bronchi send information to the inspiratory center via the vagus nerve.

141 Easy

141 of 303

Remembering +4 | -1

Asthama is caused by

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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.

142 Hard

142 of 303

Remembering +4 | -1

The thoracic chamber is formed dorsally by the …A…, ventrally by the …B…, laterally by the …C… and on lower side by the dome-shaped …D…
Select the right choices for A, B, C and D to complete the given NCERT statement

View answer and explanation

Correct option: A

A-vertebral column, B-sternum, C-ribs, D-diaphragm

Option A (A-vertebral column, B-sternum, C-ribs, D-diaphragm) is correct because it accurately describes the anatomical boundaries of the thoracic chamber.

143 Medium

143 of 303

Understanding +4 | -1

Complete the following analogy

Bombyx : Tracheal system : : Limulus :_____

View answer and explanation

Correct option: D

Book gills

Option D (Book gills) is correct because Bombyx (silkworm) uses a tracheal system, and Limulus (horseshoe crab) uses book gills for respiration.

144 Medium

144 of 303

Understanding +4 | -1

Receptors associated with the aortic arch and carotid artery can recognize the changes in …A… and

{\mathrm{H}^ + }

concentration and send necessary signals to the …B… for remedial actions Select the right choice for A and B to complete the given NCERT statement

View answer and explanation

Correct option: C

A-

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

; B-rhythm centre

Option C (A-

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

; B-rhythm centre) is correct because aortic and carotid receptors detect changes in carbon dioxide and hydrogen ion concentrations, sending signals to the rhythm center.

145 Easy

145 of 303

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.

146 Hard

146 of 303

Understanding +4 | -1

All of the following are the correct characteristic feature of lining of alveoli, except

View answer and explanation

Correct option: C

The cells are ciliated

Option C (The cells are ciliated) is correct because the cells lining the alveoli are *not* ciliated; cilia are found in the upper respiratory tract to move mucus.

147 Medium

147 of 303

Analyzing +4 | -1

Assertion: Respiratory rhythm centre is
moderated by pneumotaxic centre, located in the
medulla region of the brain.

Reason: Pneumotaxic centre controls the switch
'ON' point of inspiration.

View answer and explanation

Correct option: D

If both Assertion and Reason are false

Option D (If both Assertion and Reason are false) is correct because the respiratory rhythm center is located in the medulla, and the pneumotaxic center moderates but doesn't switch 'ON' inspiration.

148 Hard

148 of 303

Understanding +4 | -1

Why carbon monoxide (CO) poisonous for man?

View answer and explanation

Correct option: D

Haemoglobin combines with carbon monoxide instead of oxygen and the product cannot dissociate

Option D is correct because carbon monoxide binds to hemoglobin with a much higher affinity than oxygen, preventing oxygen transport and dissociation.

149 Medium

149 of 303

Analyzing +4 | -1

Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C (If Assertion is true but Reason is false) is correct because the lungs are in an airtight chamber, but the purpose is to facilitate pressure changes for breathing, not to avoid them.

150 Easy

150 of 303

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.

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.

Showing 121-150 of 303 questions

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