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

Blood do not become acidic although it carries ${\rm{C}}{{\rm{O}}_2}$ because

In ${\rm{C}}{{\rm{O}}_2}$ transport, buffers plays an important role

${\rm{C}}{{\rm{O}}_2}$ is continuously diffused through tissues

${\rm{C}}{{\rm{O}}_2}$combines with ${H_2}O$ to form ${H_2}C{O_3}$

${\rm{C}}{{\rm{O}}_2}$ is absorbed by WBC

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NEET • BIOLOGY • BREATHING AND EXCHANGE OF GASES

Breathing and exchange of gases practice · Mixed difficulty

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241 Hard

241 of 303

Understanding +4 | -1

Which of the following is correct?

View answer and explanation

Correct option: A

The

H^{+}

released from carbonic acid combines with haemoglobin to form haemoglobinic acid

Option A (The

H^{+}

released from carbonic acid combines with haemoglobin to form haemoglobinic acid) is correct because the hydrogen ions released from carbonic acid bind to hemoglobin, contributing to the buffering capacity of blood.

242 Medium

242 of 303

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).

243 Medium

243 of 303

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?

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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.

244 Easy

244 of 303

Remembering +4 | -1

Larynx is present in between

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Correct option: C

Epiglottis and trachea

The correct answer is C (Epiglottis and trachea) because the larynx is located between the epiglottis (above) and the trachea (below).

245 Medium

245 of 303

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}

246 Easy

246 of 303

Remembering +4 | -1

Nasopharynx opens through the …A… of the larynx region into the …B…
Choose the correct option for A and B to complete the given NCERT statement

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Correct option: D

A-glottis, B-trachea

The correct answer is D (A-glottis, B-trachea) because the nasopharynx opens through the glottis of the larynx region into the trachea.

247 Hard

247 of 303

Remembering +4 | -1

Select the correct statement from the following.

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Correct option: B

Type II alveolar cells are called septal cells

Option B (Type II alveolar cells are called septal cells) is correct because Type II alveolar cells are indeed also known as septal cells.

248 Medium

248 of 303

Remembering +4 | -1

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

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Correct option: D

Brain

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

249 Easy

249 of 303

Analyzing +4 | -1

A person met with an accident and died instantly without any injury to heart, brain stomach and kidney. One of the following is a reason for his death

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Correct option: D

diaphragm got punctured

Option D (diaphragm got punctured) is correct because a punctured diaphragm would immediately compromise breathing, leading to instant death.

250 Easy

250 of 303

Understanding +4 | -1

Congestion of the lungs is one of the main symptoms in

View answer and explanation

Correct option: D

Heart failure

Option D (Heart failure) is correct because congestion of the lungs is a common symptom of heart failure, where the heart cannot effectively pump blood, leading to fluid buildup in the lungs.

251 Hard

251 of 303

Understanding +4 | -1

Which of the following statements are not correct?
I. Diffusion membrane is made up of 3 layers
II. Solubility of

C{O_2}

in blood is higher than

{O_2}

by 25 times
III. Breathing volumes are estimated by spirometer
IV. High

{H^ + }

in blood favours oxygen dissociation
Choose the correct option

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Correct option: D

None of these

Option D (None of these) is correct because all the given statements are factually correct regarding respiration and gas exchange.

252 Easy

252 of 303

Remembering +4 | -1

Emphysema is a chronic disorder which is caused due to

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Correct option: C

Damaged alveolar walls

Option C (Damaged alveolar walls) is correct because emphysema is characterized by the destruction and enlargement of the alveolar walls, reducing the surface area for gas exchange.

253 Medium

253 of 303

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.

254 Hard

254 of 303

Remembering +4 | -1

Hiccup occurs due to

View answer and explanation

Correct option: B

Contraction of the diaphragm

Option B (Contraction of the diaphragm) is correct because a hiccup is caused by involuntary spasms of the diaphragm.

255 Medium

255 of 303

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

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256 Easy

256 of 303

Understanding +4 | -1

Which of the following statement is incorrect about nasopharynx?

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Correct option: B

It is the common passage for air only

Option B (It is the common passage for air only) is correct because the nasopharynx is a common passage for both air and food.

257 Hard

257 of 303

Remembering +4 | -1

The volume of anatomically dead space, air in the lungs of human beings is normally

View answer and explanation

Correct option: D

150 mL

Option D (150 mL) is correct because the volume of anatomically dead space air in the lungs is approximately 150 mL.

258 Medium

258 of 303

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.

259 Medium

259 of 303

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.

260 Medium

260 of 303

Analyzing +4 | -1

Mark the odd one with respect to respiratory organs

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Correct option: A

Pisces

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

261 Medium

261 of 303

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.

262 Medium

262 of 303

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.

263 Easy

263 of 303

Remembering +4 | -1

The role of oxygen in the regulation of respiratory rhythm is

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Correct option: A

quite insignificant

Option A (quite insignificant) is correct because the primary regulators of respiratory rhythm are CO2 and H+ levels, not oxygen.

264 Easy

264 of 303

Understanding +4 | -1

Blood do not become acidic although it carries

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

because

View answer and explanation

Correct option: C

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

transport, buffers plays an important role

The correct answer is C (In

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

transport, buffers plays an important role) because buffers in the blood, such as bicarbonate, hemoglobin, and plasma proteins, neutralize the acidity produced by carbon dioxide.

265 Medium

265 of 303

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.

266 Medium

266 of 303

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.

267 Easy

267 of 303

Remembering +4 | -1

Cigarette smoking mainly causes which of the following chronic respiratory disorder?

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Correct option: D

Emphysema

Option D (Emphysema) is correct because cigarette smoking is a major cause of this chronic respiratory disorder involving damage to the alveoli.

268 Easy

268 of 303

Remembering +4 | -1

Vocal cords are situated at

View answer and explanation

Correct option: C

Larynx

Option C (Larynx) is correct because the vocal cords are located within the larynx, also known as the voice box.

269 Easy

269 of 303

Understanding +4 | -1

Inflammation of bronchi and bronchioles leads to

View answer and explanation

Correct option: A

Asthma

Option A (Asthma) is correct because asthma involves inflammation and narrowing of the bronchi and bronchioles.

270 Medium

270 of 303

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.

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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