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

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NCERT Chapters for Class 11 Biology


Q1. Increased asthmatic attacks in certain seasons are related to

(i) Inhalation of seasonal pollen
(ii) Hot and humid environment
(iii) Low temperature
(iv) Eating fruits preserved in containers


(i) Inhalation of seasonal pollen


Q2. In man, gas exchange between the environment and the body takes place in

(i) Bronchi
(ii) Larynx
(iii) Alveoli
(iv) Trachea


(iii) Alveoli


Q3. The pneumotaxic centre is present in

(i) Medulla
(ii) Cerebrum
(iii) Cerebellum
(iv) Pons varolii


(iv) Pons varolii


Q4. Deoxygenated blood from heart comes to lungs via

(i) pulmonary vein
(ii) systemic vein
(iii) pulmonary artery
(iv) systemic artery


(iii) pulmonary artery


Q5. Which organ lies in thoracic cavity?

(i) Heart
(ii) Lungs
(iii) Pancreas
(iv) Both 1and 2


(iv) Both 1 and 2


Q6. The lungs are enclosed in a covering called

(i) Perichondrium
(ii) Pleural membrane
(iii) Pericardium
(iv) Peritoneum


(ii) Pleural membrane


Q7. Excess of water absorbed by human being is passed out in urine. Other sources is

(i) Inspiration
(ii) Expiration
(iii) Defaecation
(iv) Salivation


(ii) Expiration


Q8. Very high number of alveoli present in a lung is meant for

(i) More space for increasing volume of inspired air
(ii) More area for diffusion
(iii) Making the organ spongy
(iv) Increasing nerve supply


(ii) More area for diffusion


Q9. The two organisms which breath only through their moist skin are

(i) Frog and earthworm
(ii) Fish and frog
(iii) Leech and earthworm
(iv) Fish and earthworm


(iii) Leech and earthworm


Q10. A man respires about

(i) 40 times per minute
(ii) 72 times per minute
(iii) 12-16 times per minute
(iv) 100 times per minute


(iii) 12-16 times per minute


Q11. During inspiration muscles of diaphragm

(i) Contracts
(ii) Expands
(iii) No effect
(iv) Coiled like string


(ii) Expands


Q12. In brain, respiratory control centre lies in

(i) pons
(ii) medulla oblongata
(iii) hypothalamus
(iv) cerebrum


(ii) medulla oblongata


Q13. The maximum volume of air contained in the lung by a full forced inhalation is called

(i) Vital capacity
(ii) Tidal volume
(iii) Total lung capacity
(iv) Inspiratory capacity


(iii) Total lung capacity


Q14. Wall of alveoli is composed of

(i) Simple squamous epithelium
(ii) Simple cuboidal epithelium
(iii) Pseudostratified epithelium
(iv) Simple columnar epithelium


(i) Simple squamous epithelium


Q15. Body cavity is divided into thoracic

(i) Heart
(ii) Liver
(iii) Lungs
(iv) Diaphragm


(iv) Diaphragm


Q16. Intercostal muscles occur in:

(i) abdomen
(ii) thigh
(iii) ribs
(iv) diaphragm


(iii) ribs


Q17. The carbon dioxide is transported via blood to lungs as:

(i) dissolved in blood plasma
(ii) in the form of carbonic acid only
(iii) in combination with haemoglobin only
(iv) carbaminohaemoglobin and as carbonic acid


(iv) carbaminohaemoglobin and as carbonic acid


Q18. Which of the following is not a step in the process of respiration?

(i) Breathing
(ii) Diffusion of oxygen from blood to tissues
(iii) Production of energy
(iv) Diffusion of oxygen from tissues to blood


(i) Breathing


Q19. If TLC is 5500ml, IRV is 2950ml, ERV is 900ml and TV is 500ml then what will be value of RV?

(i) 2550ml
(ii) 1100ml
(iii) 1200ml
(iv) 1150ml


(iv) 1150ml


Q20. Which one of the following is NOT correct?

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


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


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