What is the process of exchange of gases between blood and cells called?

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The process of exchange of gases between blood and cells is called internal respiration.

Which of the following is called the volume of air that will remain in the lungs after a normal expiration process?

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Volume of air that will remain in the lungs after a normal expiration is called functional residual capacity (FRC). This includes expiratory reserve volume ERV plus residual volume (RV).

Where does the trachea divide into right and left primary bronchi?

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Trachea is a straight tube that extends up to the mid-thoracic cavity, and divides at the level of 5th thoracic vertebra into right and left primary bronchi.

Respiration that takes place in the absence of oxygen is called ____.

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Respiration can take place in the absence of O2 releasing very little energy. This is known as anaerobic respiration.

By what means are O2 and CO2 exchanged in alveoli?

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Main site of gas exchange is alveoli. O2 and CO2 are exchanged by simple diffusion mainly based on concentration/pressure gradient.

In 'EMP Pathway", EMP stands for ____.

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Embden, Meyerhof and Parnas were the scientists who discovered glycolysis. Hence, the name EMP pathway.

The rate of breathing during vigorous physical exercise increases to ____ per minute.

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During vigorous physical exercise, due to increased muscular activity, the demand for oxygen is more. This increases the breathing rate by about 20 to 25 times per minute.

Which of the following is the correct order of respiration process?

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Breathing, gaseous transport, tissue respiration and cellular respiration is the correct order of respiration process.

Which of the following factor affects the binding of O2 with the haemoglobin?

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Binding of oxygen with haemoglobin is primarily related to partial pressure of O2. Apart from the factors listed in the options, partial pressure of CO2, hydrogen ion concentration and temperature are the other factors that interfere with the binding of O2 with haemoglobin.

Which of the following is the primary chemical stimulus for breathing?

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The concentration of carbon dioxide in blood is the primary chemical stimulus for breathing.

Which of the following is not the function of conducting parts of the respiratory system?

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In the given options “Exchange of O2 and CO2”is the function of exchange part, not the conducting parts. The rest of the options are the functions of conducting parts.

In unicellular organisms like amoeba, respiration takes place by ____.

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In unicellular organisms like amoeba, respiration is through diffusion of gases through cell membrane.

Vocal cords occur in ____.

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Larynx contains vocal cords. Vocal cords vibrate to produce sound that enables us to speak.

How many molecules of O2 (maximum) can be carried by a single haemoglobin molecule?

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Each haemoglobin molecule can carry a maximum of four molecules of O2.

The expansion of ATP is ____.

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Adenosine triphosphate (ATP) is the universal currency of free energy for all living cells.

Which of the following is the main function of alveoli?

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Alveoli provide increased surface area for the diffusion of O2 and CO2.

Which of the following prevents the entry of food into the larynx?

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Epiglottis is a thin elastic cartilaginous flap which prevents the entry of food into the larynx.

What is the difference between the expired air and the inspired air?

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The expired air contains more carbon dioxide than the inspired air.

Anaerobic respiration does not require ____.

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Respiration occurring in the absence of oxygen is known as anaerobic respiration.

How inspiratory capacity is calculated?

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Total volume of air, a person can inspire after a normal expiration is called inspiratory capacity (IC). This includes tidal volume (TV) and inspiratory reserve volume (IRV).

Which of the following causes is the reason for asthma?

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Difficulty in breathing (asthma) is due to inflammation of bronchi and bronchioles.

The glottis is guarded by ____.

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The glottis is guarded by the epiglottis, because it prevents the entering of food into the trachea while swallowing food.

Which of the following statement is true?

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"The thoracic chamber has dome-shaped diaphragm at the lower side" is the correct statement. The thoracic chamber is formed: * dorsally by the vertebral column * ventrally by the sternum * laterally by the ribs * on the lower side by the dome-shaped diaphragm

During anaerobic respiration, the respiratory substrates are incompletely broken down to release ____.

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The process of respiration in the absence of oxygen is called anaerobic respiration. During this process, the respiratory substrates are incompletely broken down to release ethyl alcohol.

Which of the following statements is correct?

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Pressure contributed by an individual gas in a mixture of gases is called partial pressure.

Which of the following is the most important substrate for respiration?

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Oxygen is mainly utilized to break down glucose and to derive energy for various biological activities in the human body.

Which of the following parts are called conducting parts?

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The part starting with the external nostrils up to the terminal bronchioles are called the conducting parts. The alveoli and their ducts are the respiratory or exchange part.

When inspiration process takes place?

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When the pressure within the lungs is less than the atmospheric pressure, i.e., there is a negative pressure in the lungs with respect to atmospheric pressure.

Which of the following part of respiratory organ is called vocal cords?

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Larynx is a cartilaginous box which helps in sound production and hence it is called vocal cards (sound box).

Which of the following is a straight tube that extends up to the mid-thoracic cavity?

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Trachea is a straight tube extends up to the mid-thoracic cavity.

ICSE Class 9th Biology - Respiratory System MCQs
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ICSE Class 9th Biology - Respiratory System MCQs