Biology Class 11

Biology Class 11th Chapter 17 mcqs

Breathing and Exchange of Gases Objective Questions

  1. The function of pneumotaxic centre is

(a) regulate inspiration

(b) regulate rhythm

(c) increase heart rate

(d) all of the above

Answer: (a) regulate inspiration

  1. 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.

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

  1. ______ lies in front of esophagus.

(a) Trachea

(b) Glottis

(c) Larynx

(d) Epiglottis

Answer: (a) Trachea

  1. In brain, respiratory control centre lies in

(a) pons

(b) medulla oblongata

(c) hypothalamus

(d) cerebrum

Answer: (b) medulla oblongata

  1. Deoxygenated blood from heart comes to lungs via

(a) pulmonary vein

(b) systemic vein

(c) pulmonary artery

(d) systemic artery

Answer: (c) pulmonary artery

  1. Pleura is a layer covering

(a) heart

(b) kidneys

(c) lungs

(d) brain

Answer: (c) lungs

  1. Rheumatic fever can cause damage

(a) Alveoli of the Lungs

(b) heart valves

(c) heart muscles

(d) pleural membranes function

Answer: (b) heart valves

  1. What protects the moist membranes of the respiratory tract?

(a) Mucus and cilia

(b) A c shaped cartilage rings

(c) A pebbly epidermal surface

(d) An acidic glands

Answer: (a) Mucus and cilia

  1. RBCs, plasma and biocarbonate are the medium for transport of carbondioxide. Maximum amount of carbon dioxide is carried by

(a) RBCs

(b) Plasma

(c) Bicarbonates

(d) All RBCs and bicarbonate carried 70 per cent of carbondixide.

Answer: (c) Bicarbonates

  1. The maximum volume of air that can be released from the lungs by forceful expiration after deepest inspiration is called the ______.

(a) Total lung capacity

(b) Vital capacity

(c) Tidal volume

(d) Ventilation rate

Answer: (b) Vital capacity

  1. Which one of the followings is correct regarding larynx?

(a) It prevents foreign objects from entering the trachea

(b) It houses the vocal cords

(c) It is an organ made of cartilage and connects the pharynx to the trachea

(d) All of these are correct

Answer: (d) All of these are correct

  1. Which of the following statements is true about Trachea in a respiratory system?

(a) It functions as passages of air to each alveolus

(b) It functions for sound production

(c) It Acts as passage of air to bronchi

(d) It Lowers the surface tension

Answer: (c) It Acts as passage of air to bronchi

  1. Which of the following statement is true?

(a) Every 100 mL of deoxygenated blood delivers approximately 4 mL of carbondioxide to the alveoli.

(b) Every 100 mL of oxygenated blood delivers approximately 4 mL of oxygen to the tissues.

(c) Every 100 mL of oxygenated blood delivers approximately 4 mL of carbondioxide to the alveoli.

(d) Every 100 mL of deoxygenated blood delivers approximately 10 mL of carbondioxide to the alveoli.

Answer: (a) Every 100 mL of deoxygenated blood delivers approximately 4 mL of carbondioxide to the alveoli.

  1. Trachea divides into bronchi at

(a) 4th thoracic vertebra

(b) 5th thoracic vertebra

(c) 6th thoracic vertebra

(d) 7th thoracic vertebra

Answer: (b) 5th thoracic vertebra

  1. Aerobic respiratory pathway is also termed as ______ pathway.

(a) Anabolic

(b) Catabolic

(c) Creatine phosphate

(d) Amphibolic

Answer: (d) Amphibolic

  1. The oxygen dissociation curve is shifted to the right by an increase in ______.

(a) H+ concentration

(b) PCO2

(c) temperature

(d) All of these

Answer: (d) All of these

  1. 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

Answer: (c) Total lung capacity

  1. 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.

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

  1. Which organ lies in thoracic cavity?

(a) Heart

(b) Lungs

(c) Pancreas

(d) Both 1and 2

Answer: (d) Both 1 and 2

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