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Breathing and Exchange of Gases MCQs for NEET — Zoology Questions with Answers

Practice free Breathing and Exchange of Gases (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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Besides lungs, what other respiratory organ can amphibians like frogs utilize for gas exchange?

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Explanation

According to the NCERT text, 'Amphibians like frogs can respire through their moist skin (cutaneous respiration) also.' And from Structural Organisation in Animals: 'In water, skin acts as aquatic respiratory organ (cutaneous respiration). ... On land, the buccal cavity, skin and lungs act as the respiratory organs.'

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Which part of the human respiratory system functions to transport atmospheric air to the alveoli, clear it from foreign particles, and humidify it?

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Explanation

The NCERT text states: 'The part starting with the external nostrils up to the terminal bronchioles constitute the conducting part... The conducting part transports the atmospheric air to the alveoli, clears it from foreign particles, humidifies and also brings the air to body temperature.'

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The primary site for the actual diffusion of O2 and CO2 between blood and atmospheric air in humans is:

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Explanation

The NCERT text specifies: 'Exchange part [alveoli and their ducts] is the site of actual diffusion of O2 and CO2 between blood and atmospheric air.' Also, 'Alveoli are the primary sites of exchange of gases.'

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What is the approximate range for the volume of air inspired or expired during a normal respiration (Tidal Volume) in a healthy human?

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Explanation

The NCERT states: 'Tidal Volume (TV): Volume of air inspired or expired during a normal respiration. It is approx. 500 mL.'

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What is the volume of air remaining in the lungs even after a forcible expiration?

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Explanation

According to the NCERT text: 'Residual Volume (RV): Volume of air remaining in the lungs even after a forcible expiration. This averages 1100 mL to 1200 mL.'

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Vital Capacity (VC) is defined as:

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Explanation

The NCERT defines Vital Capacity (VC) as: 'The maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration.'

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What component of the diffusion membrane, key for gas exchange, is composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries?

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Explanation

The NCERT states: 'The diffusion membrane is made up of three major layers... namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries) in between them.'

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The process of exchange of O2 from the atmosphere with CO2 produced by the cells is called:

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Explanation

The NCERT text defines it as: 'This process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration.'

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Insects use which of the following structures for gas transport within their bodies?

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Explanation

The context mentions: '...insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body.'

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How much more soluble is CO2 compared to O2, which facilitates its diffusion through the diffusion membrane?

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Explanation

The NCERT states: 'As the solubility of CO2 is 20-25 times higher than that of O2, the amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2.'

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