Biology

Respiration and Gas Transport

606 Questions

Respiration and gas transport deal with the physiological mechanisms of breathing, including the role of hemoglobin in oxygen transport and the removal of carbon dioxide from the blood. Questions cover both aerobic and anaerobic processes, along with related phenomena like altitude sickness. This human biology topic is a staple in the science sections of competitive tests.

Oxygen and hemoglobin transportAnaerobic respiration effectsCarbon dioxide removalAltitude sickness causesBreathing rate regulation

Respiration and Gas Transport Questions

Multiple choice

The percentage of oxygen in the atmosphere is

  1. 7.8%

  2. 0.03 to 0.04%

  3. 21%

  4. 2.45%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The percentage of oxygen in the atmosphere is 21%. The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. Even if the atmosphere today has only 21 percent oxygen, today is still regarded as a period with rapid development of animals because of a high amount of oxygen in the atmosphere. 

Multiple choice

The partition between the chambers helps to avoid

  1. Leakage of blood into other chambers

  2. The pumping of blood to other parts of the body

  3. Mixing up of blood rich in oxygen and blood rich in carbon dioxide

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The partition between the chambers helps to avoid mixing up of blood rich in oxygen with the blood rich in carbon dioxide.

Multiple choice

Respiratory quotient is defined as the

  1. ratio of volume of oxygen consumed to the volume of CO2 evolved

  2. ratio of volume of CO2 evolved to the volume of oxygen consumed

  3. ratio of the amounts of products to the amounts of substrate

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Respiratory quotient is defined as the ratio of volume of CO2 evolved to the volume of oxygen consumed.

Multiple choice

Which of the following statements is incorrect?

  1. Blood transports CO2 comparatively easily because of its high solubility.

  2. CO2 diffuses into blood, passes into RBCs and reacts with water to form H2CO3.

  3. Oxyhaemoglobin of erythrocytes is basic in nature.

  4. Chloride ions diffuse from plasma into erythrocytes to maintain ionic balance.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxyhaemoglobin is a stronger acid as it allows less CO2 to be transported as bicarbonate.

Multiple choice

There are several known allotropes of oxygen. Among these ___________ is the diamagnetic form of molecular oxygen .

  1. dioxygen

  2. singlet oxygen

  3. triatomic oxygen

  4. tetraoxygen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Singlet oxygen is the common name used for the diamagnetic form of molecular oxygen which is less stable than the normal triplet oxygen. Because of its unusual properties, singlet oxygen can persist for over an hour at room temperature, depending on the environment.

Multiple choice

What is 'Hematosis'?

  1. Oxygenation of the blood

  2. Deoxygenation of the blood

  3. Stoppage of respiration due to low carbon dioxide concentration in blood

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1

Multiple choice

What is the correct equation for respiration?

  1. C6H12O6 + 6CO2 ------> 6H2O + 6CO2 + Energy

  2. C6H12O6 -------> 6CO2 + 6H2O

  3. C6H12O6 + 6O2 --------> 6CO2 + 6H2O + Energy

  4. C6H12O6 + 6H2O --------> 6CO2 + 6H2O
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

3