Here are 📘 Class 11 Biology – “Breathing and Exchange of Gases”
✅ 30 MOST ASKED MCQs
✅ Based on CBSE Board + Competitive trend (NEET-supportive)
✅ Year mentioned
✅ Answer Sheet given at the END
✅ Presented in an attractive, exam-oriented manner
🌟 CLASS 11 BIOLOGY
🫁 BREATHING AND EXCHANGE OF GASES
🔥 30 MOST REPEATED MCQs (WITH YEAR)
Q1. Breathing in humans is regulated by:
(a) Cerebrum
(b) Cerebellum
(c) Medulla oblongata
(d) Hypothalamus
📅 Asked: 2016, 2020, 2023
Q2. The volume of air breathed in and out during normal breathing is called:
(a) Vital capacity
(b) Tidal volume
(c) Residual volume
(d) Inspiratory reserve volume
📅 Asked: 2017, 2021
Q3. Which gas is transported mainly as bicarbonate ions in blood?
(a) O₂
(b) CO₂
(c) N₂
(d) CO
📅 Asked: 2015, 2019, 2024
Q4. Which structure prevents collapse of trachea?
(a) Muscles
(b) Cartilage rings
(c) Alveoli
(d) Epiglottis
📅 Asked: 2014, 2018
Q5. The exchange of gases in alveoli occurs by:
(a) Active transport
(b) Osmosis
(c) Diffusion
(d) Mass flow
📅 Asked: 2016, 2022
Q6. Which of the following has maximum oxygen concentration?
(a) Deoxygenated blood
(b) Alveolar air
(c) Atmospheric air
(d) Venous blood
📅 Asked: 2017, 2020
Q7. Which factor does NOT affect rate of breathing?
(a) Age
(b) Exercise
(c) CO₂ concentration
(d) Blood group
📅 Asked: 2015, 2019
Q8. Haemoglobin combines with oxygen to form:
(a) Carbaminohaemoglobin
(b) Oxyhaemoglobin
(c) Bicarbonate
(d) Methaemoglobin
📅 Asked: 2016, 2021
Q9. Which of the following increases oxygen dissociation from haemoglobin?
(a) Decrease in CO₂
(b) Increase in pH
(c) Increase in temperature
(d) Decrease in H⁺ ions
📅 Asked: 2018, 2023
Q10. Which condition shows reduced oxygen supply to tissues?
(a) Emphysema
(b) Asthma
(c) Hypoxia
(d) Apnoea
📅 Asked: 2017, 2022
Q11. The functional unit of lungs is:
(a) Bronchus
(b) Bronchiole
(c) Alveolus
(d) Trachea
📅 Asked: 2014, 2020
Q12. The residual volume of lungs helps in:
(a) Exchange of gases
(b) Preventing lung collapse
(c) Increasing breathing rate
(d) Removing CO₂
📅 Asked: 2016, 2019
Q13. Which of the following is an occupational respiratory disease?
(a) Asthma
(b) Bronchitis
(c) Silicosis
(d) Pneumonia
📅 Asked: 2018, 2021
Q14. Which statement about alveoli is INCORRECT?
(a) Thin-walled
(b) Moist surface
(c) Poor blood supply
(d) Large surface area
📅 Asked: 2015, 2023
Q15. Which gas is released during expiration?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Hydrogen
📅 Asked: 2014, 2019
Q16. During inspiration, diaphragm:
(a) Moves upward
(b) Moves downward
(c) Remains static
(d) Contracts upward
📅 Asked: 2017, 2022
Q17. Which lung has three lobes in humans?
(a) Left lung
(b) Right lung
(c) Both
(d) None
📅 Asked: 2016, 2021
Q18. Which factor shifts oxygen dissociation curve to right?
(a) Low temperature
(b) Low CO₂
(c) High H⁺ concentration
(d) High pH
📅 Asked: 2018, 2023
Q19. What is the normal breathing rate of adult human?
(a) 5–10/min
(b) 12–16/min
(c) 20–25/min
(d) 30–35/min
📅 Asked: 2015, 2020
Q20. Which disease is caused due to smoking?
(a) Tuberculosis
(b) Emphysema
(c) Pneumonia
(d) Influenza
📅 Asked: 2016, 2022
Q21. Which gas has highest affinity for haemoglobin?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Carbon monoxide
📅 Asked: 2017, 2023
Q22. Which volume of air remains in lungs even after forceful exhalation?
(a) Tidal volume
(b) Residual volume
(c) Vital capacity
(d) Total lung capacity
📅 Asked: 2014, 2019
Q23. Which part of respiratory tract is called voice box?
(a) Pharynx
(b) Trachea
(c) Larynx
(d) Bronchus
📅 Asked: 2016, 2021
Q24. Which is NOT a function of nasal cavity?
(a) Filtering air
(b) Warming air
(c) Gas exchange
(d) Moistening air
📅 Asked: 2015, 2020
Q25. Which blood cells transport oxygen?
(a) WBC
(b) Platelets
(c) RBC
(d) Plasma
📅 Asked: 2014, 2018
Q26. What is the cause of asthma?
(a) Infection
(b) Allergy
(c) Smoking
(d) Pollution only
📅 Asked: 2017, 2022
Q27. Which protein helps in CO₂ transport?
(a) Myoglobin
(b) Haemoglobin
(c) Albumin
(d) Globulin
📅 Asked: 2016, 2021
Q28. Which condition occurs due to lack of oxygen at high altitude?
(a) Pneumonia
(b) Asthma
(c) Hypoxia
(d) Apnoea
📅 Asked: 2018, 2023
Q29. Which law explains gas exchange in lungs?
(a) Boyle’s law
(b) Charles’ law
(c) Fick’s law
(d) Dalton’s law
📅 Asked: 2019, 2024
Q30. Main stimulus for breathing in humans is:
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
📅 Asked: 2015, 2020, 2023
✅ ANSWER SHEET (1–30)
1-c, 2-b, 3-b, 4-b, 5-c, 6-c, 7-d, 8-b, 9-c, 10-c,
11-c, 12-b, 13-c, 14-c, 15-c, 16-b, 17-b, 18-c, 19-b, 20-b,
21-d, 22-b, 23-c, 24-c, 25-c, 26-b, 27-b, 28-c, 29-c, 30-b
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