Respiration MCQs for MDCAT Practice

Biology section, Respiration chapter. Sample questions from past PMC papers.

1. Question 1
   It transports oxygen from the lungs to every tissue of the body.
   • A.Hemoglobin
   • B.Proteins
   • C.Hormones
   • D.Lipids
   • E.Antibodies
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2. Question 2
   Considering the functional anatomy, damage to the ciliated epithelium in the initial parts of the air passage would most directly impair:
   • A.The exchange of gases at the alveolar surface.
   • B.The maintenance of the airway's structural rigidity.
   • C.The warming and moistening of inhaled air.
   • D.The clearance of trapped dust and pathogens from the airway lining.
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3. Question 3
   Large dust particles are trapped in human nostrils by which of the following:
   • A.Bone
   • B.Hairs
   • C.Mucus
   • D.Both B and C
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4. Question 4
   Which one of the following acts as functional unit of lungs in man?
   • A.Air sac
   • B.Trachea
   • C.Larynx
   • D.Bronchioles
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5. Question 5
   People who migrated from plains to hills six months back _______________.
   • A.Possess more RBCs with haemoglobin of low O2 binding affinity
   • B.Possess same RBCs with haemoglobin of high O2 binding affinity
   • C.Lose physical fitness to play games like football
   • D.Suffer from altitude sickness with nausea and fatigue
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6. Question 6
   How moderate grazing is helpful for ecosystem?
   • A.It increases soil erosion and reduces biodiversity.
   • B.It reduces competition among plant species and improves water infiltration.
   • C.It increases plant diversity and soil fertility.
   • D.It decreases plant growth and nutrient cycling.
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7. Question 7
   Mechanical process which consists of two phases inspiration and expiration is called:
   • A.Respiration
   • B.Breathing
   • C.Photosynthesis
   • D.Translocation
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8. Question 8
   Lungs are porous due to the presence of:
   • A.Bronchi
   • B.Alveoli
   • C.Terminal bronchiole
   • D.Respiratory bronchiole
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