Breathing And Exchange Of Gases — DPP 2

20 NEET questions from Breathing And Exchange Of Gases, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Incidence of emphysema, a respiratory disorder is high in cigarette smokers. In such cases;
  1. A the bronchioles are found to be damaged.
  2. B the alveolar walls are found to be damaged.
  3. C the plasma membrane is found to be damaged.
  4. D the respiratory muscles are found to be damaged.
Show answer

Correct answer: B

2
Carbon dioxide entering erythrocytes reacts with water to form carbonic acid. The enzyme involved is;
  1. A Carbonic anhydrase
  2. B Carboxypeptidase
  3. C Hydrolase
  4. D Oxidoreductase
Show answer

Correct answer: A

3
Left lung of human has;
  1. A 2 lobes
  2. B 4 lobes
  3. C 3 lobes
  4. D 5 lobes
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Correct answer: A

4
Major cause of emphysema is;
  1. A Tobacco chewing
  2. B Cigarette smoking
  3. C Consuming alcohol
  4. D Steroid addiction
Show answer

Correct answer: B

5
The amount of expiratory reserve volume is;
  1. A 1500 - 1600
  2. B 2000 - 2100
  3. C 1000 - 1100
  4. D 2500 - 3000
Show answer

Correct answer: C

6
Determination of oxygen carried by haemoglobin is primarily related to;
  1. A pH of blood.
  2. B partial pressure of oxygen.
  3. C partial pressure of carbon dioxide.
  4. D All of these
Show answer

Correct answer: B

7
A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called ________.
  1. A inspiratory reserve volume
  2. B tidal volume
  3. C expiratory reserve volume
  4. D vital capacity
Show answer & explanation

Correct answer: B

The volume of air inspired or expired during normal breathing is called tidal volume. It is about 500 mL of air in average young adult man.
Therefore, option (2) is the correct answer.
8
Conduction part of the respiratory system is formed;
  1. A from external nostrils up to the initial bronchioles.
  2. B from external nostrils up to the terminal bronchioles.
  3. C from external nostrils up to the ducts of alveoli.
  4. D from external nostrils up to the alveoli.
Show answer

Correct answer: B

9
Oxyhaemoglobin dissociation curve is;
  1. A Sigmoid
  2. B Hyperbolic
  3. C Straight line
  4. D Parabolic
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Correct answer: A

10
Controlling centre of normal breathing in mammals lies in;
  1. A Cerebrum
  2. B Cerebellum
  3. C Midbrain
  4. D Medulla oblongata
Show answer

Correct answer: D

11
Pressure contributed by an individual gas in a mixture of gases is called;
  1. A Pulmonary pressure
  2. B Partial pressure
  3. C Atmospheric pressure
  4. D Pumping pressure
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Correct answer: B

12
Which one respires through gills?
  1. A Crocodile
  2. B Whale
  3. C Frog
  4. D Mollucs
Show answer

Correct answer: D

13
Assertion (A): Trachea, primary, secondary and tertiary bronchi are supported by incomplete C-shaped cartilaginous rings.
Reason (R): These rings of cartilage make the wall collapsible.
  1. A Both assertion (A) and reason (R) are true and the reason is the correct explanation of assertion.
  2. B Both assertion (A) and reason (R) are true but the reason is not the correct explanation of the assertion.
  3. C Assertion (A) is true and the reason (R) is false.
  4. D Assertion (A) is false and the reason (R) is true.
Show answer

Correct answer: C

14
Assertion (A): Carbon dioxide can diffuse more rapidly through the diffusion membrane than that of oxygen.
Reason (R): The solubility of carbon dioxide is 20-25 times higher than that of oxygen.
  1. A Both assertion (A) and reason (R) are true and the reason is the correct explanation of assertion.
  2. B Both assertion (A) and reason (R) are true but the reason is not the correct explanation of the assertion.
  3. C Assertion (A) is true and the reason (R) is false.
  4. D Assertion (A) is false and the reason (R) is true.
Show answer

Correct answer: A

15
Rate of breathing is controlled mainly by;
  1. A $\mathrm{CO}_{2}$ level in blood.
  2. B osmolarity of blood.
  3. C $\mathrm{O}_{2}$ level in blood.
  4. D $\mathrm{O}_{2}$ level and pH in blood.
Show answer & explanation

Correct answer: A

Rate of breathing is mainly controlled by $\mathrm{CO}_{2}$ level in the blood. Excess $\mathrm{CO}_{2}$ mainly stimulates the respiratory centre of the brain and increase the inspiratory and expiratory signals to the respiratory muscles.
Therefore, option (1) is the correct answer.
16
Human beings have a significant ability to maintain the respiratory rhythm to suit the demands of the body tissues. This is done by the;
  1. A Neural system
  2. B Endocrine system
  3. C Hormonal system
  4. D Pulmonary system
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Correct answer: A

17
Respiratory centre of brain is stimulated by;
  1. A carbon dioxide content in venous blood.
  2. B carbon dioxide content in arterial blood.
  3. C oxygen content in venous blood.
  4. D oxygen content in arterial blood.
Show answer

Correct answer: B

18
What is the primary health risk associated with long-term exposure to dust in industries such as grinding or stonebreaking?
  1. A Respiratory infections
  2. B Fibrosis (proliferation of fibrous tissues)
  3. C Asthma
  4. D Pneumonia
Show answer

Correct answer: B

19
In aquatic molluses, respiration occurs through;
  1. A Trachea
  2. B Gills
  3. C Book lungs
  4. D Skin
Show answer

Correct answer: B

20
Pressure within the lungs is called;
  1. A Inter-pulmonary pressure
  2. B Intra-pulmonary pressure
  3. C Interstitial pressure
  4. D Alveolar pressure
Show answer

Correct answer: B

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