CBSE Class 11 Biology Breathing and Exchange of Gases Worksheet Set A

MULTIPLE CHOICE QUESTIONS

Question. The diagram below represents part of a capillary in a specific region of the human body. The region labeled X represents part of

(a) a glomerulus
(b) an alveolus
(c) a villus
(d) the liver
Answer. B

Question. In humans, the concentration of carbon dioxide in the plasma 
(a) causes increased production of hydrochloric acid.
(b) regulates gastric acid production by forming carbonic acid.
(c) regulates breathing rate by its effect on the medulla.
(d) causes inflammation of the tissues of the bronchial tubes.
Answer. C

Question. If the respiratory rate of ‘A’ is 35 breaths/min and tidal volume 185 cc/breath and of ‘B’ is 25 breaths/min and tidal volume 259 cc/breath then 
(a) Pulmonary ventilation of ‘A’ and ‘B’ is same.
(b) Alveolar ventilation of ‘A’ and ‘B’ is same.
(c) Pulmonary ventilation of ‘A’ is greater than ‘B’.
(d) Alveolar ventilation of ‘A’ is greater than ‘B’.
Answer. C

Question. Oxyhaemoglobin can transport 
(a) 8 ml of CO₂/100 ml blood
(b) 5 ml of CO₂/100 ml blood
(c) 3 ml of CO₂/100 ml blood
(d) 2 ml of CO₂/100 ml blood
Answer. C

Question. Which of the following match is correct?
(a) Emphysema: reduction of surface area of alveoli and bronchi
(b) Pneumonia: occupational disease with asbestos
(c) Silicosis: inflammation of alveoli
(d) Asthma: excessive secretion of bronchial mucus
Answer. A

Question. Volume of air breathed in and out during normal breathing is called
(a) Vital capacity
(b) IRV
(c) ERV
(d) Tidal volume
Answer. D

Question. Much developed larynx of human male is called
(a) Aristole's lanttern
(b) Syrinx
(c) Adam's apple
(d) Muller's organ
Answer. C

Question. Approximately seventy percent of carbondioxide absorbed by the blood will be transported to the lungs
(a) as bicarbonate ions
(b) in the form of dissolved gas molecules
(c) by binding to RBC
(d) as carbamino - haemoglobin
Answer. A

Question. During oxygen transport the oxyhaemoglobin at the tissue level liberates oxygen to the cells because in tissue 
(a) O₂ concentration is high and CO₂ is low
(b) O₂ concentration is low and CO₂ is high
(c) O₂ tension is high and CO₂ tension is low
(d) O₂ tension is low and CO₂ tension is high
Answer. D

ASSERTION REASON QUESTIONS

Directions : These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.

Question. Assertion : Many visitors to the hills suffer from skin and respiratory allergy problems.
Reason : Conifer trees produce a large quantity of wind-borne pollen grains.
Answer. B

Question. Assertion : Severe Acute Respiratory Syndrome (SARS) is originated in China.
Reason : China is the most populated country of the world. 
Answer. B

Directions : Each of these questions contains an Assertion followed by Reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Question. Assertion : Oxyhaemoglobin dissociates near the organ tissue due to Bohr effect and oxygen is released. 
Reason :Increased CO₂ concentration reduces the affinity of haemoglobin for oxygen.
Answer. A

Question. Assertion: In mammals, complex respiratory system has developed. 
Reason: Mammalian skin is impermeable to gases
Answer. B

Question. Assertion : Inspiration occurs due to muscular relaxation.
Reason : During inspiration, the diaphragm and external intercostal muscle contract simultaneously.
Answer. C

Please click the link below to download CBSE Class 11 Biology Breathing and Exchange of Gases Worksheet Set A