MCQ Questions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases with Answers

MCQ Questions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases with Answers

Check the below NCERT MCQ Questions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases with Answers Pdf free download. MCQ Questions for Class 11 Biology with Answers were prepared based on the latest exam pattern. We have provided Breathing and Exchange of Gases Class 11 Biology MCQs Questions with Answers to help students understand the concept very well.


Q1. Oxygen dissociation curve of haemoglobin is:

(a) Sigmoid
(b) Hyperbolic
(c) Linear
(d) Hypobolic

(a) Sigmoid


Q2. Air is breathed through:

(a) Trachea — lungs — larynx — pharynx — alveoli
(b) Nose — larynx — pharynx — bronchus — alveoli — bronchioles
(c) Nostrils — pharynx — larynx — trachea — bronchi — bronchioles — alveoli
(d) Nose — mouth — lungs

(c) Nostrils — pharynx — larynx — trachea — bronchi — bronchioles — alveoli


3Q. The exchange of gases in the alveoli of the lungs takes place by:

(a) simple diffusion
(b) osmosis
(c) active transport
(d) passive transport

(a) simple diffusion


Q4. Wall of alveoli is composed of

(a) Simple squamous epithelium
(b) Simple cuboidal epithelium
(c) Pseudostratified epithelium
(d) Simple columnar epithelium

(a) Simple squamous epithelium


Q5. The lungs are enclosed in a covering called

(a) Perichondrium
(b) Pleural membrane
(c) Pericardium
(d) Peritoneum

(b) Pleural membrane


Q6. People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude

(a) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
(b) there is more UV radiation which enhances RBC production
(c) people eat more nutritive food, therefore more RBCs are formed
(d) people get pollution – free air to breathe and more oxygen is available

(a) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive


Q7. Increased asthmatic attacks in certain seasons are related to

(a) Inhalation of seasonal pollen
(b) Hot and humid environment
(c) Low temperature
(d) Eating fruits preserved in containers

(a) Inhalation of seasonal pollen


Q8. What percentage of CO2 flows in blood in form of bicarbonates

(a) 7%
(b) 23%
(c) 50%
(d) 70%

(d) 70%


Q9. Chloride shift for the transport of

(a) O2
(b) CO2
(c) CO
(d) Ozone

(b) CO2


Q10. Cartilaginous rings in trachea are incomplete at which surface.

(a) Dorsal
(b) Ventral
(c) Lateral
(d) Ventrolateral

(a) Dorsal


Q11. The two organisms which breathe only through their moist skin are

(a) Frog and earthworm
(b) Fish and frog
(c) Leech and earthworm
(d) Fish and earthworm

(c) Leech and earthworm


Q12. Expiration involves

(a) Relaxation of diaphragm and intercostal muscles
(b) Contraction of diaphragm and intercostal muscles
(c) Contraction of diaphragm muscles
(d) Contraction of intercostal muscles

(a) Relaxation of diaphragm and intercostal muscles


Q13. Thoracic cavity is enlarged by contraction of

(a) Internal Intercostal muscles
(b) Diaphragm
(c) Lungs
(d) All of above

(b) Diaphragm


Q14. Book lungs are respiratory organs of

(a) Mammals
(b) Mollusca
(c) Earthworm
(d) Arachnida

(d) Arachnida


Q15. The carbon dioxide is transported via blood to lungs as:

(a) dissolved in blood plasma
(b) in the form of carbonic acid only
(c) in combination with haemoglobin only
(d) carbaminohaemoglobin and as carbonic acid

(d) carbaminohaemoglobin and as carbonic acid


Q16. Aerobic respiratory pathway is also termed as __ pathway.

(a) Anabolic
(b) Catabolic
(c) Creatine phosphate
(d) Amphibolic

(d) Amphibolic


Q17. The oxygen dissociation curve is shifted to the right by an increase in __.

(a) H+ concentration
(b) PCO2
(c) temperature
(d) All of these

(d) All of these


Q18. The maximum volume of air contained in the lung by a full forced inhalation is called

(a) Vital capacity
(b) Tidal volume
(c) Total lung capacity
(d) Inspiratory capacity

(c) Total lung capacity


Q19. Which one of the following is NOT correct?

(a) The nasal cavity warms and humidifies the air before it enters the lungs
(b) The right lung is composed of three lobes, but the left lung has only two lobes.
(c) Lung volumes and vital capacity measure lung function.
(d) The visceral pleura is in direct contact with the chest wall.

(d) The visceral pleura is in direct contact with the chest wall.


Q20.N Which organ lies in thoracic cavity?

(a) Heart
(b) Lungs
(c) Pancreas
(d) Both 1and 2

(d) Both 1and 2


Q21. The alveolar epithelium in the lungs is:

(a) nonciliated columnar
(b) nonciliated squamous
(c) ciliated columnar
(d) ciliated squamous

(b) nonciliated squamous


Q22. Habit of Cigarette smoking can lead to :

(a) loss of cilia lining the respiratory tract
(b) emphysema
(c) coughing
(d) All of the Above

(d) All of the Above


MCQ Questions for Class 11 Biology with Answers Chapter Wise


We hope the given NCERT MCQ Questions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases with Answers Pdf free download will help you. If you have any queries regarding CBSE Class 11 Biology Breathing and Exchange of Gases MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

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