Download NEET MCQs for NEET Biology: 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.
Chapter-wise Objective Questions: Breathing and Exchange of Gases
View or download the dedicated Breathing and Exchange of Gases MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.
Multiple Choice Questions
(a) Equal to adult
(b) Less then adult
(c) More than adult
(d) None
Show Answer & Explanation
Answer: (c) More than adult
Explanation:
1. A new born baby has a higher metabolic rate and breathes about 30 to 60 times a minute, more than an adult (12 to 16).
Teacher's Note:
1. Rate falls with age.
2. Babies breathe faster.
(a) W.B.C.
(b) RBC
(c) Blood plasma
(d) All MECHANISM AND REGULATION OF RESPIRATION, PULMONARY CAPACITIES, OXYGEN AND CARBONDIOXIDE TRANSPORT, RESPIRATORY DISORDERS
Show Answer & Explanation
Answer: (b) RBC
Explanation:
1. Carbonic anhydrase is abundant in red blood cells and speeds the reaction between CO2 and water.
Teacher's Note:
1. It is a zinc enzyme.
2. It is in RBC.
(a) Respiratory centres are not affected by CO2
(b) In humans vital capacity is just double the expiratory volume
(c) A human lung has 103 alveoli
(d) During inspiration the lungs act as suction pump
Show Answer & Explanation
Answer: (d) During inspiration the lungs act as suction pump
Explanation:
1. During inspiration the lung expands passively and draws air in like a suction pump. CO2 does affect the respiratory centre, and the vital capacity is not just double the expiratory volume.
Teacher's Note:
1. Alveoli number in millions, not 103.
2. Lungs act as suction pumps.
(a) Reversible union with Oxygen
(b) It is Blue colour
(c) Presence of Cu
(d) Presence of globulin portein
Show Answer & Explanation
Answer: (a) Reversible union with Oxygen
Explanation:
1. Haemoglobin combines reversibly with oxygen: it takes oxygen in the lungs and releases it to tissues.
Teacher's Note:
1. It contains iron, not copper.
2. Hb binds O2 reversibly.
(a) Pharynx
(b) Larynx
(c) Glottis
(d) Bronchial tube
Show Answer & Explanation
Answer: (b) Larynx
Explanation:
1. The vocal cords are in the larynx (voice box).
Teacher's Note:
1. The glottis is the opening of the larynx.
2. Vocal cords lie in the larynx.
(a) Trachea & alveolar duct
(b) Trachea & bronchi
(c) Alveolar duct & alveoli
(d) Alveoli & Trachea
Show Answer & Explanation
Answer: (c) Alveolar duct & alveoli
Explanation:
1. Gaseous exchange takes place in the alveoli and the alveolar ducts. Trachea and bronchi only conduct air.
Teacher's Note:
1. Exchange needs thin walls.
2. Alveolar region exchanges gases.
(a) reproductive pigment
(b) respiratory pigment
(c) carbohydrate
(d) fat
Show Answer & Explanation
Answer: (b) respiratory pigment
Explanation:
1. Haemoglobin is the red respiratory pigment that carries oxygen.
Teacher's Note:
1. It is in RBC.
2. Hb is respiratory pigment.
(a) bicarbonate shift
(b) chloride shift
(c) potassium shift
(d) all of these
Show Answer & Explanation
Answer: (b) chloride shift
Explanation:
1. The chloride shift is also known as the Hamburger phenomenon.
Teacher's Note:
1. It involves Cl- and HCO3-.
2. Hamburger phenomenon is chloride shift.
(a) Vital capacity
(b) Tidal volume
(c) IRV
(d) ERV
Show Answer & Explanation
Answer: (a) Vital capacity
Explanation:
1. The volume of air breathed out after a maximum inspiration is vital capacity.
Teacher's Note:
1. It equals TV + IRV + ERV.
2. Maximum expiration after deep inspiration is vital capacity.
(a) sigmoid curve
(b) parabolic
(c) hyperbolic
(d) straight line
Show Answer & Explanation
Answer: (a) sigmoid curve
Explanation:
1. The oxygen dissociation curve plotted against pO2 is S shaped (sigmoid).
Teacher's Note:
1. It shows cooperative binding.
2. It is sigmoid.
(a) H+
(b) K+
(c) HCO3–
(d) Na+
Show Answer & Explanation
Answer: (c) HCO3–
Explanation:
1. When HCO3- diffuses out of the RBC, chloride ions move in to balance the charge, hence the chloride shift responds to bicarbonate movement.
Teacher's Note:
1. It maintains electrical neutrality.
2. Cl- shifts in response to HCO3-.
(a) Tidal volume
(b) Reserve volume
(c) Residual volume
(d) None of these
Show Answer & Explanation
Answer: (a) Tidal volume
Explanation:
1. The volume inspired or expired in each normal breath is tidal volume (about 500 mL).
Teacher's Note:
1. Residual volume remains in lungs.
2. Normal breath volume is tidal.
(a) TV + IRV + ERV
(b) TV + IRV + RV
(c) TV + ERV
(d) IRV + ERV
Show Answer & Explanation
Answer: (a) TV + IRV + ERV
Explanation:
1. Vital capacity is the maximum air that can be breathed out after maximum inhalation and equals TV + IRV + ERV.
Teacher's Note:
1. It is about 3.5 to 4.5 L.
2. VC = TV + IRV + ERV.
(a) columnar ciliated epithelium
(b) cuboidal epithelium
(c) neurosensory epithelium
(d) germinal epithelium
Show Answer & Explanation
Answer: (a) columnar ciliated epithelium
Explanation:
1. Nasal passages and bronchioles are lined by ciliated columnar epithelium that traps and moves mucus.
Teacher's Note:
1. Squamous lines alveoli.
2. Ciliated columnar lines passages.
(a) (iii) (iv) (ii) (i) (v)
(b) (iii) (i) (ii) (v) (iv)
(c) (iii) (i) (iv) (v) (iv)
(d) (iv) (iii) (ii) (i) (v)
Show Answer & Explanation
Answer: (b) (iii) (i) (ii) (v) (iv)
Explanation:
1. Tidal volume 500 mL, IRV 2500 to 3000 mL, ERV 1000 mL, residual volume 1200 mL and vital capacity 3400 to 4800 mL, which matches option 2.
Teacher's Note:
1. Memorise the volumes.
2. Match volumes with values.
(a) cuboidal epithelium
(b) columnar epithelium
(c) stratified cuboidal epithelium
(d) squamous epithelium
Show Answer & Explanation
Answer: (d) squamous epithelium
Explanation:
1. Alveoli are lined by thin simple squamous epithelium to allow rapid diffusion.
Teacher's Note:
1. It is one cell thick.
2. Alveoli have squamous lining.
(a) 40 mm of Hg
(b) 42 mm of Hg
(c) 44 mm of Hg
(d) 46 mm of Hg
Show Answer & Explanation
Answer: (a) 40 mm of Hg
Explanation:
1. The partial pressure of CO2 in alveolar air is about 40 mm Hg.
Teacher's Note:
1. Oxygen is about 104 mm Hg.
2. Alveolar pCO2 is 40.
(a) haemorrhage of pulmonary capillaries
(b) increase in number of air sacs
(c) infection of mycobacterium trabeculae
(d) inflation of alveolar sacs
Show Answer & Explanation
Answer: (d) inflation of alveolar sacs
Explanation:
1. Emphysema is a chronic disorder in which alveolar walls are damaged and alveoli become over inflated, reducing the surface area.
Teacher's Note:
1. Smoking is a major cause.
2. Alveoli are inflated.
(a) shift to left
(b) shift to right
(c) remain unchanged
(d) will oscillate erratically
Show Answer & Explanation
Answer: (b) shift to right
Explanation:
1. A fall in pH (more acidic) shifts the oxygen dissociation curve to the right, so Hb releases more O2 (Bohr effect).
Teacher's Note:
1. Low pH, high pCO2 and high temperature shift it right.
2. Lower pH shifts to right.
(a) lesser than tidal volume
(b) greater than inspiratory volume
(c) greater than vital capacity
(d) greater than tidal volume
Show Answer & Explanation
Answer: (d) greater than tidal volume
Explanation:
1. Residual volume (about 1100 to 1200 mL) is greater than tidal volume (about 500 mL), as it stays in lungs after maximal expiration.
Teacher's Note:
1. It cannot be expelled.
2. RV exceeds tidal volume.
(a) gills
(b) contractile vacuole
(c) skin
(d) lungs
Show Answer & Explanation
Answer: (c) skin
Explanation:
1. The skin or body surface is the simplest respiratory organ, as used by earthworms and amphibians.
Teacher's Note:
1. Gills and lungs are more complex.
2. Skin is the simplest organ.
(a) dissolved in plasma and transported
(b) remains in lungs
(c) attached to cell membranes
(d) inside the mitochondria (5) in peroxisomes
Show Answer & Explanation
Answer: (a) dissolved in plasma and transported
Explanation:
1. About 97 percent of oxygen is carried by haemoglobin and about 3 percent is dissolved in the plasma.
Teacher's Note:
1. CO2 is carried differently.
2. 3 percent is dissolved in plasma.
Breathing and Exchange of Gases Objective Questions & Solutions for NEET Biology
Download Multiple Choice Questions: Breathing and Exchange of Gases (NEET Biology)
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Concept Clarification for Breathing and Exchange of Gases
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FAQs
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