What will be the ${\rm{p}}{{\rm{O}}_{\rm{2}}}$ and ${\rm{pC}}{{\rm{O}}_{\rm{2}}}$ in the atmospheric air compared to those in the alveolar air?

${\rm{p}}{{\rm{O}}_{\rm{2}}}$ higher, ${\rm{pC}}{{\rm{O}}_{\rm{2}}}$ lesser

${\rm{p}}{{\rm{O}}_{\rm{2}}}$ lesser, ${\rm{pC}}{{\rm{O}}_{\rm{2}}}$ higher

${\rm{p}}{{\rm{O}}_{\rm{2}}}$ higher, ${\rm{pC}}{{\rm{O}}_{\rm{2}}}$ higher

${\rm{p}}{{\rm{O}}_{\rm{2}}}$ lesser, ${\rm{pC}}{{\rm{O}}_{\rm{2}}}$ lesser

Blood carries ${\rm{C}}{{\rm{O}}_2}$ mainly, in which form?

${\rm{Hb}}.{\rm{\;C}}{{\rm{O}}_2}$

${\rm{Hb}}.{\rm{\;C}}{{\rm{O}}_2}{\rm{\;and\;CO}}$

Greater than inspiratory volume

Back to BREATHING AND EXCHANGE OF GASES

Your Progress

0 / 126 Answered

Correct

Incorrect

Accuracy

NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Medium

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Take a chapter quiz →

Showing 91-120 of 126 questions

Preparing practice and saved progress…

91 Medium

91 of 126

Understanding +4 | -1

What will be the

\mathrm{p}{\mathrm{O}_\mathrm{2}}

and

\mathrm{pC}{\mathrm{O}_\mathrm{2}}

in the atmospheric air compared to those in the alveolar air?

View answer and explanation

Correct option: B

\mathrm{p}{\mathrm{O}_\mathrm{2}}

higher,

\mathrm{pC}{\mathrm{O}_\mathrm{2}}

lesser

Option B (

\mathrm{p}{\mathrm{O}_{\mathrm{2}}}

higher,

\mathrm{pC}{\mathrm{O}_{\mathrm{2}}}

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

92 Medium

92 of 126

Analyzing +4 | -1

Assertion: The anatomical set up of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity (Pulmonary cavity).

Reason: Lungs have no muscles so we can directly alter the pulmonary volume.

View answer and explanation

Correct option: C

Assertion is true but the reason is false

Option C (Assertion is true but the reason is false) is correct because the assertion is correct, but lungs lack muscles to directly alter pulmonary volume.

93 Medium

93 of 126

Understanding +4 | -1

Lungs do not enclose

View answer and explanation

Correct option: B

Trachea

Option B (Trachea) is correct because the trachea is located outside of the lungs, while bronchi, bronchioles, and alveoli are all enclosed within the lungs.

94 Medium

94 of 126

Remembering +4 | -1

Ventilation refers to the

View answer and explanation

Correct option: A

Movement of air into and out of the lungs

Option A (Movement of air into and out of the lungs) is correct because ventilation specifically refers to the process of air moving in and out of the lungs.

95 Medium

95 of 126

Remembering +4 | -1

The chemo sensitive area situated to the respiratory rhythm Centre is highly sensitive to

View answer and explanation

Correct option: B

{H^ + }

Option B (

{H^ + }

) is correct because the chemosensitive area is highly sensitive to changes in hydrogen ion concentration, which is influenced by carbon dioxide levels.

96 Medium

96 of 126

Remembering +4 | -1

During swallowing, glottis can be covered by a thin elastic cartilaginous flap called …A… to prevent the entry of food into larynx. Trachea is a straight tube extending up to …B… cavity, which divides at the level of 5th thoracic vertebra into right and left primary …C…
Choose the correct option for A, B and C from the given four options to complete the above statement with reference to NCERT textbook

View answer and explanation

Correct option: B

A-epiglottis, B-mid thoracic, C-bronchi

The correct answer is B (A-epiglottis, B-mid thoracic, C-bronchi) because the epiglottis covers the glottis during swallowing, the trachea extends up to the mid-thoracic cavity, and divides into right and left primary bronchi.

97 Medium

97 of 126

Remembering +4 | -1

Additional muscles in the …… impacts the ability of humans to increase the strength of inspiration and expiration. Complete the given NCERT statement with an appropriate option

View answer and explanation

Correct option: C

Abdomen

Option C (Abdomen) is correct because additional muscles in the abdomen impact the ability of humans to increase the strength of inspiration and expiration.

98 Medium

98 of 126

Remembering +4 | -1

Rate of breathing is controlled mainly by

View answer and explanation

Correct option: A

C{O_2}

level in blood

Option A (

C{O_2}

level in blood) is correct because the primary regulator of breathing rate is the concentration of carbon dioxide in the blood.

99 Medium

99 of 126

Remembering +4 | -1

Lungs comprises

View answer and explanation

Correct option: D

All of these

The correct answer is D (All of these) because lungs comprise a network of bronchi, bronchioles, and alveoli.

100 Medium

100 of 126

Analyzing +4 | -1

Assertion (A): Thoracic chamber is anatomically an air- tight chamber and any change in its volume has no effect whatever on the pulmonary cavity.

Reason (R): Lungs are situated in the thoracic cavity and this arrangement is essential for breathing.

Choose the correct answer from the following options.

View answer and explanation

Correct option: D

(A) is false but (R) is true

Option D ((A) is false but (R) is true) is correct because the assertion is false, while the reason is true.

101 Medium

101 of 126

Analyzing +4 | -1

Assertion : Emphysema disease is very common
in Kanpur and Calcutta.

Reason : It is disease of respiratory tract
occuring due to pollution.

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 emphysema is indeed common in polluted areas like Kanpur and Calcutta, and pollution is a major cause.

102 Medium

102 of 126

Understanding +4 | -1

Decrease in pH of blood at tissue level will

View answer and explanation

Correct option: C

Decrease the affinity of haemoglobin with oxygen

The correct answer is C (Decrease the affinity of haemoglobin with oxygen) because a decrease in pH (increased acidity) at the tissue level causes hemoglobin to release oxygen more readily, decreasing its affinity for oxygen (Bohr effect).

103 Medium

103 of 126

Application +4 | -1

If alveolar ventilation is 4200 ml/min, respiratory frequency is 12 breaths per minute, and tidal volume is 500 ml, what is the anatomical dead space of ventilation?

View answer and explanation

Correct option: A

1800 ml/min

Option A (1800 ml/min) is correct because anatomical dead space ventilation is calculated as Anatomical dead space x Respiratory frequency.

104 Medium

104 of 126

Remembering +4 | -1

Blood carries

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

mainly, in which form?

View answer and explanation

Correct option: B

\mathrm{NaHC}{\mathrm{O}_3}

Option B (

\mathrm{NaHC}{\mathrm{O}_3}

) is correct because carbon dioxide is primarily transported in the blood as bicarbonate ions (

\mathrm{NaHC}{\mathrm{O}_3}

105 Medium

105 of 126

Remembering +4 | -1

Which one of the following organs in the human body is most affected due to shortage of oxygen?

View answer and explanation

Correct option: D

Brain

Option D (Brain) is correct because the brain has a high metabolic rate and is extremely sensitive to oxygen deprivation.

Explore Other Chapters in BIOLOGY

View All →

ANIMAL KINGDOM 756 MCQs PLANT KINGDOM 415 MCQs ANATOMY OF FLOWERING PLANTS 404 MCQs MOLECULAR BASIS OF INHERITANCE 404 MCQs CHEMICAL COORDINATION AND INTEGRATION 387 MCQs PRINCIPLE OF INHERITANCE AND VARIATION 374 MCQs

106 Medium

106 of 126

Analyzing +4 | -1

Assertion: Respiratory rhythm centre present in pons of brain is responsible for regulation of respiration.

Reason: Carotid bodies are sensitive to

{CO}_2

and

{H}^+

ion concentration in venous blood.

View answer and explanation

Correct option: D

Both Assertion and Reason are false

Option D (Both Assertion and Reason are false) is correct because the respiratory rhythm center is in the medulla, not pons, and carotid bodies are sensitive to arterial blood.

107 Medium

107 of 126

Application +4 | -1

How much

\mathrm{CO}_2

is delivered by

5 \mathrm{~L}

of deoxygenated blood to alveoli?

View answer and explanation

Correct option: B

200 \mathrm{~ml}

Option B (200 ml) is correct because deoxygenated blood delivers approximately 4 ml of

CO_2

per 100 ml of blood. Therefore, 5L (5000 ml) of blood delivers 200 ml of

CO_2

108 Medium

108 of 126

Understanding +4 | -1

Residual volume is

View answer and explanation

Correct option: D

Greater than tidal volume

Option D (Greater than tidal volume) is correct because residual volume is the air remaining in the lungs after maximal exhalation, which is typically larger than the tidal volume.

109 Medium

109 of 126

Remembering +4 | -1

The smallest and thinnest tube in the lung is

View answer and explanation

Correct option: D

Bronchiole

Option D (Bronchiole) is correct because bronchioles are the smallest and thinnest tubes within the lungs.

110 Medium

110 of 126

Analyzing +4 | -1

Mark the odd one with respect to respiratory organs

View answer and explanation

Correct option: A

Pisces

Option A (Pisces) is correct because Pisces (fish) primarily use gills for respiration, while the others use lungs.

111 Medium

111 of 126

Remembering +4 | -1

Hemoglobin is a type of

View answer and explanation

Correct option: B

Respiratory pigment

Option B (Respiratory pigment) is correct because hemoglobin is a protein in red blood cells that carries oxygen, thus functioning as a respiratory pigment.

112 Medium

112 of 126

Understanding +4 | -1

If a large number of people are enclosed in a room, then

View answer and explanation

Correct option: A

Oxygen decreases and carbon dioxide increases

Option A (Oxygen decreases and carbon dioxide increases) is correct because people consume oxygen and release carbon dioxide during respiration.

113 Medium

113 of 126

Understanding +4 | -1

On high mountains difficulty in breathing is due to

View answer and explanation

Correct option: A

Decrease in partial pressure of oxygen

Option A (Decrease in partial pressure of oxygen) is correct because at high altitudes, the partial pressure of oxygen is lower, making it harder for oxygen to diffuse into the blood.

114 Medium

114 of 126

Remembering +4 | -1

Which structure of the lungs is directly involved in

{O_2}

C{O_2}

exchange between air and blood capillary?

View answer and explanation

Correct option: C

Alveoli

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

115 Medium

115 of 126

Remembering +4 | -1

When 1200 mL air is in the lungs, it is called

View answer and explanation

Correct option: A

Residual volume

Option A (Residual volume) is correct because residual volume is approximately 1200 mL and is the air remaining in the lungs after maximal exhalation.

116 Medium

116 of 126

Remembering +4 | -1

Site of aerobic respiration in higher organisms is/are

View answer and explanation

Correct option: B

Mitochondria

The correct answer is B (Mitochondria) because mitochondria are the site of aerobic respiration in eukaryotic cells, including those of higher organisms.

117 Medium

117 of 126

Analyzing +4 | -1

Find the incorrect statement:

View answer and explanation

Correct option: C

Contraction of external inter costal muscles increases the volume of lungs along Antero-posterior axis in rabbit.

Option A (Contraction of external intercostals muscles in man causes expansion of lungs along the Antero-posterior axis) is incorrect because contraction of external intercostals muscles in man causes expansion of lungs along the dorso-ventral axis, not the antero-posterior axis.

118 Medium

118 of 126

Remembering +4 | -1

The volume of air that will remain in the lungs after a normal expiration is known as

View answer and explanation

Correct option: B

Functional residual capacity

Option B (Functional residual capacity) is correct because functional residual capacity is the volume of air remaining in the lungs after a normal expiration.

119 Medium

119 of 126

Analyzing +4 | -1

Which of the following situations would result in the greatest degree of

{O}_2

saturation for haemoglobin, assuming

{pO}_2

remains constant?

View answer and explanation

Correct option: C

Decreased

{CO}_2

levels, decreased acidity

Option C (Decreased

{CO}_2

levels, decreased acidity) is correct because these conditions shift the oxygen dissociation curve to the left, increasing hemoglobin's affinity for oxygen.

120 Medium

120 of 126

Understanding +4 | -1

Why breathing is accelerated when the person opens his nose after holding the breathe by closing his nose?

View answer and explanation

Correct option: A

C{O_2}

build up in the body

Option A (

CO_2

build up in the body) is correct because holding breath causes

CO_2

to accumulate, stimulating the respiratory center when breathing resumes.

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 91-120 of 126 questions

Your Progress

Breathing and exchange of gases practice · Medium

Explore Other Chapters in BIOLOGY

Continue Your Practice

Your practice