Breathing And Exchange Of Gases — DPP 1

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
Relaxation of diaphragm decreases the volume of thoracic chamber in the;
  1. A antero-posterior axis.
  2. B dorso-ventral axis.
  3. C ventro-lateral axis.
  4. D dorso-lateral axis.
Show answer

Correct answer: A

2
Mechanism of breathing vary among different groups of animals depending mainly on their;
A. Habits
B. Habitats
C. Levels of organisation
D. Demand of situation
  1. A A and B
  2. B B and C
  3. C B, C and D
  4. D A, B, C and D
Show answer

Correct answer: B

3
The amount of carbon dioxide that is delivered by every 100 ml of deoxygenated blood to the alveoli is _________.
  1. A 2 ml
  2. B 3 ml
  3. C 4 ml
  4. D 5 ml
Show answer

Correct answer: C

4
Assertion (A): Inspiration can occur if intra-pulmonary pressure is less than the atmospheric pressure.
Reason (R): Atmospheric air will move from outside to inside when contraction of diaphragm and external intercostal muscles take place.
  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

5
Contraction of diaphragm causes which of the following?
  1. A Increase the volume of the thoracic chamber in the antero-posterior axis
  2. B Increase the volume of thoracic chamber in the dorso-ventral axis
  3. C Decrease the volume of the thoracic chamber in the antero-posterior axis
  4. D Decrease the volume of the thoracic chamber in the dorso-ventral axis
Show answer

Correct answer: A

6
Air is breathed through;
  1. A trachea → lungs → larynx → pharynx → alveoli
  2. B nose → larynx → pharynx → bronchus → alveoli → bronchioles
  3. C nostrils → pharynx → larynx → trachea → bronchi → bronchioles → alveoli
  4. D nose → mouth → lungs
Show answer

Correct answer: C

7
Assertion (A): Asthma is difficulty in breathing causing wheezing.
Reason (R): Asthma occurs due to inflammation of bronchi and bronchioles.
  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

8
After taking a long deep breath we do not respire for some seconds due to;
  1. A more $\mathrm{CO}_{2}$ in blood.
  2. B more CO in blood.
  3. C less $\mathrm{CO}_{2}$ in blood.
  4. D less $\mathrm{O}_{2}$ in blood.
Show answer & explanation

Correct answer: C

After taking a long deep breathe we do not respire for some seconds due to less $\mathrm{CO}_{2}$ in blood.
Therefore, option (3) is the correct answer.
9
Vital capacity of lungs is;
  1. A IRV + ERV
  2. B $\mathrm{IRV}+\mathrm{ERV}+\mathrm{TV}-\mathrm{RV}$
  3. C $\mathrm{IRV}+\mathrm{ERV}+\mathrm{TV}+\mathrm{RV}$
  4. D $\mathrm{IRV}+\mathrm{ERV}+\mathrm{TV}$
Show answer & explanation

Correct answer: D

Vital capacity is the maximum volume of air a person can breathe in after a forced expiration or the maximum volume of air a person can breathe out after a forced inspiration. This equals the Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV) + Tidal Volume (TV).
Therefore, option (4) is the correct answer.
10
Primary sites of the gaseous exchange are;
  1. A Trachea
  2. B Alveoli
  3. C Tissue
  4. D Nostrils
Show answer

Correct answer: B

11
When the carbon dioxide concentration in blood increases, the rate of breathing will;
  1. A Remain unaffected
  2. B Decrease
  3. C Stop
  4. D Increase
Show answer

Correct answer: D

12
Which of the following best describes Functional Residual Capacity (FRC)?
  1. A The total volume of air a person can inhale after a normal expiration
  2. B The volume of air that remains in the lungs after a normal expiration
  3. C The maximum volume of air a person can exhale after a forced inspiration
  4. D The maximum volume of air a person can breathe in after a forced expiration
Show answer

Correct answer: B

13
Collapsing of lungs may be due to;
  1. A lack of surfactant in the alveoli.
  2. B lack of surfactant in the bronchi.
  3. C puncture of the abdominal cavity.
  4. D both (1) and (2)
Show answer

Correct answer: A

14
Pneumotaxic centre which can moderate the respiratory rhythm centre is present in;
  1. A pons region of brain
  2. B thalamus
  3. C spinal cord
  4. D right cerebral hemisphere
Show answer & explanation

Correct answer: A

Pneumotaxic center is present in the dorsal part of the pons varolii of the brain. Its function is primarily to limit inspiration.
Therefore, option (1) is the correct answer.
15
Which of the following specialised centre is primarily responsible for the regulation of respiratory rhythm?
  1. A Chemosensitive area
  2. B Respiratory rhythm centre
  3. C Pneumotaxic centre
  4. D Receptors associated with aortic arch and carotid artery
Show answer

Correct answer: B

16
What is the role of the pleural fluid?
  1. A To increase the volume of the thoracic cavity
  2. B To support the bronchial tubes
  3. C To reduce friction on the lung surface
  4. D To aid in sound production
Show answer

Correct answer: C

17
Which of the following has no specialised respiratory structures?
  1. A Crab
  2. B Earthworm
  3. C Salmon
  4. D Ant
Show answer

Correct answer: B

18
The anatomical setup of lungs in thorax is such that any change in the volume of the ....A....will be reflected in the ....B....
  1. A A-thoracic cavity, B-pulmonary cavity
  2. B A-abdominal cavity, B-thoracic cavity
  3. C A-thoracic cavity, B-nasal cavity
  4. D Both (1) and (3)
Show answer

Correct answer: A

19
Maximum how many molecules of oxygen is carried by each molecule of haemoglobin?
  1. A five
  2. B two
  3. C three
  4. D four
Show answer

Correct answer: D

20
Diffusion of oxygen in tissues of cockroach occurs through;
  1. A Blood
  2. B Integument
  3. C Trachea
  4. D Tracheoles
Show answer

Correct answer: D

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