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

Haemoglobin is a type of

  1. vitamin

  2. skin pigment

  3. carbohydrate

  4. respiratory pigment
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Haemoglobin is a type of respiratory pigment.

Multiple choice

Why does all the oxygen in the atmosphere not get used up though a large number of organisms are consuming it?

  1. Oxygen is produced using oxygen cylinders.

  2. Oxygen is replenished in the air by the plants during photosynthesis.

  3. Oxygen is released in the atmosphere from the oceans by aquatic animals.

  4. Oxygen is released in the atmosphere by respiration of animals.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxygen is replenished in the air by the plants during photosynthesis.

Multiple choice

How many molecules of oxygen are carried in haemoglobin?

  1. 4

  2. 2

  3. 6

  4. 8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each chain contains one heme group each of which contains one iron ion. The iron is the site of oxygen binding. Each iron can bind one O2 molecule. Thus, each haemoglobin molecule is capable of binding a total to four O2 molecules.

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

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Multiple choice

What is the effect of H2S on blood?

  1. It destroys the nucleus of the blood cells.

  2. It destroys the haemoglobin in the blood.

  3. It destroys the plasma membrane of the blood cells.

  4. It reacts with haemoglobin and forms sulphoxy haemoglobin.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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Multiple choice

Respiratory quotient is defined as

  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 the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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Multiple choice

Oxygen dissociation curve is

  1. a sigmoid

  2. sloping

  3. a parabola

  4. a straight line

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen dissociation curve is meant for the affinity of oxygen for haemoglobin. It relates oxygen saturation and partial pressure of oxygen in the blood (pO2). It actually explains how readily haemoglobin acquires and releases oxygen molecules from its surrounding tissue. It is sigmoid in nature.