Breathing and Exchange of Gases Online Objective Test | Breathing and Exchange of Gases Online Objective Test

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q1. Which of the following pair of factors are considered favourable for the formation of oxyhaemoglobin?

A. low

p O_{2}

& low

H^{+}

concentration

B. High

H^{+}

concentration & high

p O_{2}

C. low pCO₂& low temperature

D. low

H^{+}

concentration & high

p C O_{2}

Answer : Option C
Explaination / Solution:

In the alveoli, where there is high

p_{O_{2}}

, low

p_{C O_{2}}

, lesser

H^{+}

concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q2.

Read the following statements :

i. Pressure contributed by and individual gas in a mixture of gases is called its partial pressure
ii. $p_{C O_{2}}$ in alveolar air is 45 mm Hg and in venous blood is 40 mm Hg.

A. Statement i) is correct and ii) is wrong.

B. both are wrong

C. both are correct

D. Statement i) is wrong and ii) is correct.

Answer : Option A
Explaination / Solution:

In a mixture of gases, each gas has a partial pressure which is the hypothetical pressure of that gas if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas mixture is the sum of the partial pressures of each individual gas in the mixture.
The $p_{C O_{2}}$ in alveolar air is 40 mm Hg and in venous blood is 45 mm Hg.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q3. The principle of exchange of gases at the lungs is :

A. Diffusion

B. both diffusion and filtration

C. Conditioning and facilitated transport

D. Filtration

Answer : Option A
Explaination / Solution:

The main function of the respiratory system is gaseous exchange. This refers to the process of Oxygen and Carbon Dioxide moving between the lungs and blood. Diffusion occurs when molecules move from an area of high concentration (of that molecule) to an area of low concentration. This occurs during gaseous exchange as the blood in the capillaries surrounding the alveoli has a lower oxygen concentration of Oxygen than the air in the alveoli which has just been inhaled.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q4.

Read the following statements :

i. The affinity of Hb for CO is 200 to 250 times more than its affinity for oxygen therefore CO competes with oxygen for binding to Hb.
ii. The result of this binding are a shift of oxygen-hemoglobin dissociation curve to the left and its alteration to a more hyperbolic shape.

A. Statement i) is wrong and ii) is correct

B. both are wrong

C. both are correct

D. Statement i) is correct and ii) is wrong

Answer : Option C
Explaination / Solution:

The affinity of Haemoglobin is 200 to 250 times more than that of Oxygen, therefore, CO competes with Oxygen for binding to Hb. Due to this binding a shift of oxygen-hemoglobin dissociation curve to left and its alteration to a more hyperbolic shape.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q5. Expiration will take place when there is :

A. less pressure within lungs as compared to atmospheric pressure

B. both B & C

C. positive intrapulmonary pressure

D. negative intrapulmonary pressure

Answer : Option C
Explaination / Solution:

Expiration is the release of carbon dioxide rich air from thoracic cavity. When the volume of air decreases and pressure increase the air from chest moves out. This kinds of pressure is called positive intrapulmonary pressure.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q6.

RBCs and muscle cells carry out anaerobic respiration, but :

i. RBCs are permanently anaerobic and muscle cells are temporarily anaerobic
ii. RBCs are temporarily anaerobic and muscle cells are permanently anaerobic
iii. Muscle cells lack mitochondria.

A. None of the statements are correct.

B. only statement ii) is correct.

C. only statement ii) and iii) are correct.

D. only statement i) is correct.

Answer : Option D
Explaination / Solution:

Red blood cells and muscle cells carry out anaerobic respiration but RBC’s are permanently anaerobic and muscle cells are temporarily anaerobic in nature.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q7.

Water breathing is more problematic than air breathing because :

i. water is 800 times more dense and hence holds much more oxygen than air does.
ii. since oxygen dissolved in water diffuses far more slowly than air therefore large quantity of water is required to be passed over the gills.

A. statement i) is wrong and ii) is correct.

B. statement ii) is wrong and i) is correct.

C. both statements are wrong.

D. both statements are correct.

Answer : Option A
Explaination / Solution:

Water breathing is more problematic than air breathing because oxygen dissolved in water diffuses far more slowly than air therefore large quantity of water is required to be passed over the gills.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q8. Read the following about blood pigments :

i. Hemoglobin is the pigment present in our blood and is iron containing protein.
ii. Haemocyanin is the pigment present in blood of Palaemon and is copper containing protein.
iii. Haemocyanin is much more efficient than haemoglobin.

A. only statement i) and ii) are correct.

B. only statement i) is correct.

C. all statements are correct.

D. only statement ii) and iii) are correct.

Answer : Option A
Explaination / Solution:

Haemoglobin is the pigment present in our blood and is iron containing protein. Haemocyanin is the pigment present in blood of Palaemon and is copper containing protein.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q9.

The given graph shows $O_{2}$ consumption and ventilation during exercise so we can infer from this graph :

i. During exercise, oxygen consumption rate in our body increases.
ii. Neural stimulus allows abdominal muscles , which are a kind of smooth muscle to contract to facilitate ventilation while exercising.
iii. Increase in ventilation during exercise prevents large changes in the partial pressure of $O_{2}$ or $C O_{2}$
iv. The overall impact is breathing rate increases.

A. only i),iii) and iv) are correct.

B. only i) and ii) are correct.

C. only i) and iii) are correct.

D. all the above statements are correct.

Answer : Option A
Explaination / Solution:

During exercise Oxygen consumption and ventilation changes drastically. Oxygen consumption rate in our body increases during exercise. Increase in ventilation during exercise prevents large change in the partial pressure of

O_{2}

and

C O_{2}

to increase breathing rate.

# Breathing and Exchange of Gases # CBSE 11th Biology Prepare / Learn

Q10. The exchange of gases in :

i. the alveoli that lowers the

p O_{2}

of blood and raises its

p C O_{2}

is external respiration
ii. the tissues that lowers the

p C O_{2}

of blood and raises its

p O_{2}

is internal respiration

A. statementi) is wrong and ii) is correct.

B. statement ii) is wrong and i) is correct.

C. both statements are correct.

D. both statements are wrong.

Answer : Option D
Explaination / Solution:

In the alveoli, there is high

p O_{2}

, low

p C O_{2}

, lesser H+ concentration and lower temperature,

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