NEET Biology Breathing And Exchange Of Gases MCQs Set 13

Biology Objective Questions and Answers: Breathing and Exchange of Gases

Access targeted multiple-choice questions for Breathing and Exchange of Gases designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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Multiple Choice Questions

Question 1: Which of the following groups of animals use gills for respiration?
(a) Fishes, frog, tadpole larva
(b) Fish, Mollusca, aquatic arthropods
(c) Reptiles, birds, mammals
(d) Insects, earthworm, Mollusca
Show Answer & Explanation

Answer: (b) Fish, Mollusca, aquatic arthropods

Explanation:
1. Fishes, molluscs and aquatic arthropods have gills
2. An adult frog breathes through lungs and skin, and insects use tracheae

Teacher's Note:
1. Recall the NCERT fact.

Question 2: During swallowing of food, which structure prevents food from entering the glottis?
(a) Semilunar valve
(b) Circular muscular flap
(c) Cartilaginous flap
(d) Circular sphincter
Show Answer & Explanation

Answer: (c) Cartilaginous flap

Explanation:
1. The epiglottis is a cartilaginous flap
2. It covers the glottis during swallowing

Teacher's Note:
1. Recall the NCERT fact.

Question 3: Incomplete cartilaginous rings support all of the following except:
(a) trachea
(b) primary and secondary bronchi
(c) respiratory bronchioles
(d) initial bronchioles
Show Answer & Explanation

Answer: (c) respiratory bronchioles

Explanation:
1. Trachea, bronchi and initial bronchioles have incomplete cartilage rings
2. Respiratory bronchioles have none

Teacher's Note:
1. Recall the NCERT fact.

Question 4: Which is a common passage for food and air?
(a) trachea
(b) oesophagus
(c) pharynx
(d) glottis
Show Answer & Explanation

Answer: (c) pharynx

Explanation:
1. The pharynx is shared by the digestive and respiratory tracts

Teacher's Note:
1. Recall the NCERT fact.

Question 5: Which is the correct sequence of the air passage in man?
(a) Nasal cavity, pharynx, trachea, larynx, bronchi, bronchioles, alveoli
(b) Nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli
(c) Nasal cavity, larynx, pharynx, trachea, bronchi, bronchioles, alveoli
(d) Nasal cavity, larynx, bronchi, pharynx, trachea, bronchioles, alveoli
Show Answer & Explanation

Answer: (b) Nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli

Explanation:
1. Air passes from the nose to pharynx, larynx (sound box), trachea, bronchi and bronchioles, then reaches the alveoli

Teacher's Note:
1. Recall the NCERT fact.

Question 6: Which of the following respiratory tubules has no dead space air?
(a) segmental bronchi
(b) secondary bronchi
(c) alveolar duct
(d) primary bronchi
Show Answer & Explanation

Answer: (c) alveolar duct

Explanation:
1. Gas exchange occurs from the respiratory bronchioles and alveolar ducts onwards, so they do not hold dead space air

Teacher's Note:
1. Recall the NCERT fact.

Question 7: At which level of the vertebral column does the trachea divide to form the bronchi?
(a) 4th thoracic vertebra
(b) 5th thoracic vertebra
(c) 5th lumbar vertebra
(d) 3rd thoracic vertebra
Show Answer & Explanation

Answer: (b) 5th thoracic vertebra

Explanation:
1. The trachea divides at the level of the 5th thoracic vertebra

Teacher's Note:
1. Recall the NCERT fact.

Question 8: Arrange the steps of respiration in the order in which they occur: (i) diffusion of gases across the alveolar membrane; (ii) diffusion of O2 and CO2 between blood and tissues; (iii) breathing; (iv) utilisation of O2 by cells; (v) transport of gases by blood.
(a) (i), (ii), (iii), (iv), (v)
(b) (iii), (i), (ii), (v), (iv)
(c) (iii), (i), (v), (ii), (iv)
(d) (iii), (ii), (iv), (i), (v)
Show Answer & Explanation

Answer: (c) (iii), (i), (v), (ii), (iv)

Explanation:
1. Breathing is first, then alveolar diffusion, blood transport, tissue diffusion and finally cellular use of O2

Teacher's Note:
1. Recall the NCERT fact.

Question 9: The respiratory organs of insects are:
(a) moist cuticle
(b) tracheal tubes
(c) body surface
(d) gills
Show Answer & Explanation

Answer: (b) tracheal tubes

Explanation:
1. Insects have a network of tracheal tubes opening through spiracles

Teacher's Note:
1. Recall the NCERT fact.

Question 10: Which statement about inspiration is correct?
(a) Contraction of the diaphragm increases the volume of the thoracic cage in the dorsoventral axis
(b) Contraction of external intercostal muscles lifts the ribs and sternum, increasing the thoracic volume in the dorsoventral axis
(c) Contraction of the diaphragm decreases the thoracic volume in the antero-posterior axis
(d) Contraction of internal intercostal muscles increases the thoracic volume
Show Answer & Explanation

Answer: (b) Contraction of external intercostal muscles lifts the ribs and sternum, increasing the thoracic volume in the dorsoventral axis

Explanation:
1. The diaphragm flattens and increases the volume in the antero-posterior axis
2. External intercostals lift the ribs and sternum, which enlarges the thorax in the dorsoventral axis

Teacher's Note:
1. Recall the NCERT fact.

Question 11: Expiration takes place when the intrapulmonary pressure is:
(a) greater than atmospheric pressure
(b) less than atmospheric pressure
(c) equal to atmospheric pressure
(d) equal to intrapleural pressure
Show Answer & Explanation

Answer: (a) greater than atmospheric pressure

Explanation:
1. Air leaves the lungs when the pressure inside exceeds the atmospheric pressure

Teacher's Note:
1. Recall the NCERT fact.

Question 12: Which is the true statement about normal breathing?
(a) Inspiration is passive and expiration is active
(b) Inspiration is active and expiration is passive
(c) Both are active
(d) Both are passive
Show Answer & Explanation

Answer: (b) Inspiration is active and expiration is passive

Explanation:
1. Inspiration needs muscle contraction, whereas expiration in quiet breathing is by elastic recoil

Teacher's Note:
1. Recall the NCERT fact.

Question 13: The volume of the thoracic chamber increases in the antero-posterior and dorsoventral axes respectively by:
(a) contraction of the diaphragm and external intercostal muscles
(b) relaxation of the diaphragm and external intercostal muscles
(c) contraction of external intercostal muscles and the diaphragm
(d) contraction of abdominal muscles and relaxation of external intercostals
Show Answer & Explanation

Answer: (a) contraction of the diaphragm and external intercostal muscles

Explanation:
1. The diaphragm acts on the antero-posterior (vertical) axis and the external intercostals on the dorsoventral axis

Teacher's Note:
1. Recall the NCERT fact.

Question 14: Lungs do not collapse between breaths and some air always remains in them because:
(a) there is a positive intrapleural pressure
(b) pressure in the lungs is higher than atmospheric
(c) there is a negative pressure in the lungs
(d) there is a negative intrapleural pressure pulling at the lung walls
Show Answer & Explanation

Answer: (d) there is a negative intrapleural pressure pulling at the lung walls

Explanation:
1. The negative intrapleural pressure keeps the lungs expanded, so a residual volume stays

Teacher's Note:
1. Recall the NCERT fact.

Question 15: The volume of air a healthy man inspires or expires per minute, about 6000 to 8000 mL, is called:
(a) vital capacity
(b) tidal volume
(c) pulmonary ventilation
(d) functional residual capacity
Show Answer & Explanation

Answer: (c) pulmonary ventilation

Explanation:
1. Tidal volume x breaths per minute gives the pulmonary ventilation

Teacher's Note:
1. Check the units: mL per minute is a ventilation rate.

Question 16: The additional volume of air a person can expire by a forcible expiration (ERV) is:
(a) 2500 to 3000 mL
(b) 6000 to 8000 mL
(c) 1000 to 1100 mL
(d) 1200 to 1500 mL
Show Answer & Explanation

Answer: (c) 1000 to 1100 mL

Explanation:
1. Expiratory reserve volume is about 1000 to 1100 mL

Teacher's Note:
1. Recall the NCERT fact.

Question 17: Arrange in the order of increasing volume: A tidal volume, B residual volume, C inspiratory reserve volume, D vital capacity.
(a) A < B < C < D
(b) A < C < B < D
(c) A < D < C < B
(d) A < D < B < C
Show Answer & Explanation

Answer: (a) A < B < C < D

Explanation:
1. Tidal volume is 500 mL, residual volume 1100 mL, IRV 2500-3000 mL and vital capacity 3500-4500 mL

Teacher's Note:
1. Recall the NCERT fact.

Question 18: The volume of air remaining in the lungs after a normal expiration is:
(a) vital capacity
(b) functional residual capacity
(c) residual volume
(d) total lung capacity
Show Answer & Explanation

Answer: (b) functional residual capacity

Explanation:
1. FRC = ERV + RV

Teacher's Note:
1. Recall the NCERT fact.

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Practice MCQs for NEET Biology Breathing and Exchange of Gases

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